structures de poisson logarithmiques: invariants
TRANSCRIPT
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Structures de Poisson Logarithmiques : invariantscohomologiques et préquantification
Joseph Dongho
To cite this version:Joseph Dongho. Structures de Poisson Logarithmiques : invariants cohomologiques et préquantifica-tion. Analyse classique [math.CA]. Université d’Angers, 2012. Français. tel-00985181
♥♥é
♦rr
❯❱
♦ ♦t♦r ❯
ès ♦t♦rt ❯♥rsté ♥rs
♥t♦♥ té♠tqs
Prés♥té ♣r
♦s♣ ♦♥♦
♥r à
à ❯♥rsté ♥rs à ♥rs
trtrs P♦ss♦♥ ♦rt♠qs ♥r♥ts♦♦♠♦♦qs t ♣réq♥tt♦♥
r②
♣♣♦rtrs
r♠♥♦ r Pr♦ssr ♥ss r③ rr♦ Pr♦ssr ❯
①♠♥trs
♥ ♦♠s Pr♦ssr ♥rs♥ r♥r Pr♦ssr ♥rs
è ♦ ♦②♦♠ Pr♦ssr ♦♥t♣r
rtr ès ❱♦♦② ♦ts♦ Pr♦ssr ♥rs♦♥rr t♦♥ ♦♠♦ Pr♦ssr ❯♥ ❨♦♥é
é♣rt♠♥t té♠tqs ❯♥rsté ♥rs ❯
♦r ♦sr ①
➒ ♥♦tê ♠ á♠
♠r♠♥ts
r♠r s Pr♦ssrs ♥ ♦♠s t t♦♥ ♦♠♦ q
♦♥t éé ♠♦♥ ♥térêt ♣♦r ♦♠♥ t♦♣♦♦ érq t ♠♦♥t t
♦♥♥îtr ♦rt♦r ♥♥ r ♥ té♠tqs ♦ù
tt tès été té é♠r à é♠r
♦t ♠ rtt Pr♦ssr ❱♦♦② ♦ts♦ q ♠
♦rt♦r t ♣té ♥rr ♠s tr① P♥♥t t♦t tt ♣ér♦
é♥éé s ♦♥t♥ tt♥t♦♥ qté ss ①♣t♦♥s t ss
ss ♦♥ss sés s rr s ♣r♦è♠s réés ♣r st♥ t ♦ssé
♥♠érq q ♥♦s sé♣rt q♥ éts ♠r♦♥ ♥éstt ♣s à ♠
♦♥r ♣r téé♣♦♥ q♥ ss ♠s rst♥t s♥s ré♣♦♥s ê♠ ss ♠s
t ss ♥s ♥s s s ❯r♥♥s t ss ♥ ♠♣ê♥t ♣s
r ♠s ♣r♦ts ♠ s♦♥s q ♣r ♣s ♥ ♦s t ♦é r ♥
❯r♥ à ♦s♦ ♣♦r ♠ ♦♥ttr t ré♣♦♥r à ♠s qst♦♥s
été étr♠♥♥t ♥s tr ♥ tr♦ ♥ t qt ♥ r♥çs
♣♦♥t ♠ ♣r♠ttr ①♣r♠r q rss♥t ♣r♦♦♥ ♠♦ ♥ s♦♥ st
♦t t ♣r ♠r à r♥r ♥t♣ ss q
r t ♠① q q ♦♥q r ♣r q st q r♣rés♥t
♣♦r ♠♦ ♥ r♠r s♥èr♠♥t
P♦r r r♠r é♠♥t t♦s s ♠♠rs ♦rt♦r
q ôt♦②és q♦t♥♥♠♥t r à ♦r ❳ ♠s
❨ ♦♥ ❯ r♥ç♦s ❱ r♥t
❯ r♥r réér ♥P♣♣ ♥
❯ ♥ ❱ s ❩❨ P♦tr ❯ ♦ ❯
♦ï ❲ ♦♣ ♦♦♣ ♥qs
❯❯ ést♥ P❯ s♥ ❱❱
r ❯ P♣♣ ♦
♠♠ ❨ è ❨❱ éè♥ q ♦♥t
♦♥♥é ♣♦t♥t à ♠ tr ♠té♠tq à trrs rs rs ①♣♦sés
r♠r ♣rtèr♠♥t s Pr♦ssrs ♥qs ♦r
t♦r t ❯ ♦ï rtr ♦♥t ♣♦r t♦ts s
tés ♠♥strts t r ♥ ♥s trt♠♥t ♠s ♦ssrs rs
srs étr♥♠♥t r♦♥♥ss♥t
r♠r
s srétrs ♦rt♦r t ♥♦s ♦térs s ❯
tr♥ ❯❩ ①♥r Ptt♦r♣s r♥ç♦s r♦♥
♠
s rtrs é♣rt♠♥t P♣♣ ❯ ♥ ❯ t
r♥ç♦s ❯
s rtrs ♦rt♦r ♥ ♠ P❯
t ♥q
♥é♥r s②stè♠ q♥
r♠r ♣rtèr♠♥t ♥ q ♣♣r♦ ♥ é♠
r ♠♦♥ ♥sr♣t♦♥ ♥ tès ♦rt♦r t q ♠ré ss ♦♣t♦♥s
tr♦t t♦♦rs ♥ t♠♣s ♣♦r ♣♣♦rtr s ①♣t♦♥s sr s ♣♦♥ts ♦♠r
♣r♦① rt t♦ st rsté r♥t t♦t t♠♣s tt♥t à ♠s
qst♦♥s s ♣r♥t ♣r♦s ss ♦t♦♥s q♦t♥♥s ♣♦r tr♦r s
ré♣♦♥ss à ♠s ♥s ♥♦rs ♠s s♦♥ ♠ érr ♥s
q ♠ tr♥s♠t ❱♦♦② s s♦t♦♥s à ♠s ♣r♦è♠s ♥ ♥r
sqs t ♦t♥ ♣rès ♥ ss ♦♦rtrs ♥ s♣♥ ♦♥ r
♠étt t♦♦rs ♦rt s♦t ♦♦r ♦ù à s à é ♠é♦tt t
♠♣♣♦rtt s ①♣t♦♥s ♥éssrs ♠rr ♠ ♠♥r s ♥st ♣s
♠♦♥ tr rtr tès ss ♦ r♠ttr ♥t♣
r♠r ♥♥ ♦r ♣té êtr ♠♠r r② tt tès
r♠r é♠♥t Pr♦ssr è ♦ ♦②♦♠ q ♣t ♠♦♥
tt♥t♦♥ ♥rs é♦♠étr à trrs s♦♥ ♥♦ ①♣♦sé sr ❱èr à
①è♠ r♥♦♥tr r♦♣ ♦♣♦♦ t é♦♠étr rq ♥tr à
❯♥rsté s♥ ♥ é♠r ê♠ ♠ t t♦s ♠s ♣r♦ts
t ♠ tr♥s♠s ♥ ♣rès ♥ s ♦rrt♦♥s ♥éssrs r♠r ♣♦r
s♦♥ ♥tt♦♥ t q ♠ résré ♦♠r à ❯
❯ P ♥ ♣r♦t
♣♦r r♠rr t♦s s ♠♠rs ♦rt♦r ♣♦r r r♥t
♦rt sé♦r r♠r ♥♥ ♦r ♣té r ♣rt s ♠♠rs r②
r♠r Pr♦ssr r♠♥♦ r ♣♦r ♥térêt q ♣♦rté à s
tr① t ♣♦r ♦r ♣té tâ r♣♣♦rtr ss ♣rtèr♠♥t
r♦♥♥ss♥t ♣♦r ss ①♣t♦♥s st s s♦t♦♥s ♣tqs s éqt♦♥s
P râ à r♦s ♦r ♦♠♣rs s ♥♦t♦♥s rétés rr t
rêt♠♥t t♥♥t ♥♦rs ♠s ♥♦s sss♦♥ ss ♦
s r♥r ♥t♣
r③♦ Pr♦s♦r s r③ r♦ ♣♦r ss tr♦s ♠út♣s s♦r ♦s
s♦rs rs ② ♣r r ♣t♦ ♣sr ♦s ♣③♦s r♦s trr st
tss s rs sñ♦r Pr♦s♦r
r♠r é♠♥t ♦tr ♥ P♣ r ♦♠é♦ ♣♦r s♦♥ à
♥rs ♥ ss ♠t♣s ♦♣s s t ♠s s ♥♦r♠♥ts ♠t♣s
♠♦♥t été ♥ ♠♣♦rt♥ ♣t ♥s tr
r♠r ♠s ♠rs ♦t♦r♥ts ①♥r ❯
♠r ❯ ③③ ❯ ♦♠♥ é♠ é♠ ♥
①② r ♦♣ ❨ ♥sts ② ❯ ♦♠s③
r♥ P ♥r② P❯ ❯ ❨ ❲ ❳
♦♥ r ❨ s ♦♥t s ♠♦♠♣♥é t♦t ♦♥
s r♥èrs ♥♥és r♠r ♣rtèr♠♥t ①♥r
P❯ t ③♥♥ st♦♥ ♣♦r ♠♦r é à ♦rrr t①t r♠r
Pstr st♦♥ ♦r② ♥♥tt sr ♦ t t♦s s rèrs s
♥éq ♣♦r r s♦t♥ s♥s t rs ♠t♣s ♣rèrs r♠r
ss ♠s ♥♥s ♦ès ②é ❨♦♦ ♣♦r r s♦t♥ t ♥♦r♠♥ts
♣♥s ♣rtèr♠♥t à ♦ ♦rt♥ ♦♠s ♦♥ ♠
r r♠r ♣r♦♦♥é♠♥t rèr ♦♥♦ ♦s♣ t ♦r tt ♣♦r
r ♣rèrs t é♥ét♦♥s
s tr① ♥r♥t ♠s ♦ts s♥s ❯ ss
♠♥ ♠ ♣r♦♥♥r ♣♦r t♦s ♠s ér♠♥ts s ♦♦♥té s♦♠♣ss
à t♦s s âs t ♥ t♦t t♠♣s
r♠r s ♦r♥strs ♣r♦t ♣♦r r s♦t♥ s♥s
t♥s à r♠rr ♣rtèr♠♥t r ♥P♦rt ♥ès ♦♠③
♥♥ t ② ❱♥♥t ♣♦r rs ♠t♣s ♥tr♥t♦♥s r♥t s tr①
r♠r t♦s s ♣rs♦♥♥s ♠ss r♥ ♠r♦♥ ♣♦r s
♠t♣s s ♦rés
t♥s é♠♥t à ①♣r♠r ♠s r♠r♠♥ts ♥rs s trs ♠r♦
❯ ❯♥rsté ❨♦♥é r ♥ ♦ ❯♥rsté
r♦ ♣♦r rs s♦t♥s ♦♥t♥s r♠r Pr♦ssrs ♦ ss
rtr ♦ ♦r♠ ♣érr r♦ ♦tr ♦r♠♥
é♣rt♠♥t té♠tqs r♦ Pr♦ssr
r♥ç♦s ❲♠♦♥ ♦ ♦rrt ♦t♠ é♣rt♠♥t
té♠tqs ❯♥rsté ❨♦♥é ♦tr ♠ t t♦s
s ♠♠rs é♣rt♠♥t té♠tqs ❯♥rsté ❨♦♥é
r♠r ♠s ♦ès ①s rt ♦r r r♥♥ Prr ♦ t
t♦s s ♣rs♦♥♥s r♦
r ss à ♥♥ ♦ ♦♥ ♠ t♥r é♣♦s ♣♦r s ♥♥és
sr tt tès ♥♥ ♦♠é ssé ♣r ss r♠s ♥♦tr♥s
r♠r ss ♠♦♥ ♦♥ ③♠ ♥r t s♦♥ é♣♦s ♣♦r r ♥tt♦♥
à ♦s s♦r r♠r ♥♥ ♠♥ ♥♥ ♠♠♦ t P♣ ♦s♣
♠♦ ♣♦r r ♣rèrs ♦♥t♥s ♣♥s s♥s ss à ♠ é♥t r♥ ♠èr
q ♠♥ s♥s ss à ♠ ♦rr ♦♥r t q ♠♣♣rs ♣t♥
t ♣r♦♥
r♠r ♣rtèr♠♥t P♣ ♥ st♥ ♣♦r t♦t s♦♥ s♦t♥ t ss
♥♦♠r① ♥♦r♠♥ts ♦♠♠ttrs ♥ ♣éé ♠♣r♦♥♥ s ♦s
♠♠♥ tt t P♣ ♦♠ss ts ss q ss ♣ssé ♥♣rç
s r♥èrs ♥♥és s ♦♠♣r♥r♦♥t ♥♠♥t ♣♦rq♦ ♥s ①
♥ srs r♥ ♥♦rs ♣s à ♦r♥♥ t ♠♠♥ ③♥♥ r
♥ ♣♥sé ♣s ♣♦r r♣♦s q r♠♣ç ♠ é♥t r♥ ♠èr
♠s q ♠rs♠♥t t é ♣r ♥ ♦tr ♥s s ♣r♦♣r s♥
t♦ ♠♠♥ ♠♥ q trr ♥♦s ♥êtrs t s♦t éèr
r ♥ s♦♥r ♥♦ ♠ q s♥s ss ♠♥♦r
t t ♠ ♣r♠ttt rtr♦r t♦♥ ♠ t ♠tr♥ q ♠
♠♥qt ♥ s t♠♣s ♥ ♣ssés à ♥rs s ♣♦r ♠♦ ♣s q♥ ♠èr
t r♠r ♠♦r ♦♥♥é ♥ ♣ ♥s t♦♥ ♦②r ♠ ♦♥♥r s♥s
♦t ♥ ♠♦②♥♥ étr♥sr ts t♦♥s ♥rs ♠♦ ss ♦ très t
é♥r t♦s ① q ♦♥t é t♦qé à ♦tr ♣♦rt râ à ♦s ♠s sé♦rs à ♥rs
♦♥t été ♠ ♠♥s♠ t t♥rss r♠r éé♥ t t ❱♦♦②
♠♦r ♣té ♦♠♠ rèr t ♥♦♥ ♦♠♠ étr♥r ♦s s♦t ♥ ♥r
♠rs t ♦♠é râs ss q r r ♥ ♣r♦r ♠r♦♥s
t ♦♥ ♥ ♣t r♠ssr s ♠♥s ♣ ♥ ♣r♥r s♦é
é♦t s ♣rèr s s ① ♠ t ♥ t ♦r à tt
♠ t♦ts s ♦♥♥s râs q ♠ért ♣r♥ s étrsss ♥ ♠♦♥
♥♥♠é ♣r s♣tr ♠ t sr s s♥trs t♠t① ♥ q
♦ss ♦♠♠ t s ♣r♦♠s à ♥♦s ï① s é♥ét♦♥s ♠♣ts à r rté
r♠r ♥♥ ♠s ♥♥ts ♠♦ ❱rs ♠ts ③♠
r s r♦ ♠ ♦ts♦ t ♦t r ♣♦r rs
♣rèrs s♥s ss à ♠♦♥ ér ♥♦rs ♣s ♠s s♦rs t rèrs ♠♦
r♥st♥ ♦ ttr♥ ♦t ②sé r♥r ♦♥♥
Ps ♠♥ ♦♥t♥ t♥♦ ♠ ♦tt ♥♠ r♥ ♥t
ttr♥ ♣♦r r ♥♦♠r① srs à ♠♦♥ ♥r♦t r ♥ très r♥
♠rt♦♥ à ér ♠s t♥ts à ♦♥ à ③ à ♦
r♠r ♠♦♥ ♦s♥ Pr♦ssr ♠♦ rt Ps t t♦t s ♠ ♣♦r
r s♦t♥ s♥s
s ♠tèrs
♥tr♦t♦♥ é♥ér
st ès
t ès
ts t ♠ét♦s tr
♦♥strt♦♥ ♠♦ s ér♥ts ♦r♠s ♦rt
♠qs
trtrs P♦ss♦♥ ♦rt♠qs t ♦♦♠♦♦ P♦s
s♦♥ ♦rt♠q
Préq♥tt♦♥ ♦rt♠q
s réstts ♣r♥♣①
♦♥strt♦♥ s èrs P♦ss♦♥ ♦rt♠qs
♦♥strt♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q t
qqs ①♠♣s
♣♣t♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦tés
r s ♦r♠s ér♥ts ♦rt♠qs
r s strtrs P♦ss♦♥ ♦rt♠qs t ♥r♥ts ♦
♦♠♦♦qs
Prs♣ts
r s èrs P♦ss♦♥ ♦rt♠qs
r s ♦r♠s ér♥ts ♦rt♠qs
r q♥tt♦♥
r s strtrs P♦ss♦♥ ♦rt♠qs
èrs P♦ss♦♥ ♦rt♠qs
ért♦♥s ♦rt♠qs
ér♥ts ♦r♠s ♦rt♠qs
éré ♣r r♣♣♦rt à ♥ ért♦♥ ♦rt♠q
trtrs èrs P♦ss♦♥ ♦rt♠qs
qs ①♠♣s èrs P♦ss♦♥ ♦rt♠qs
❱rétés P♦ss♦♥ ♦rt♠qs
sr r
❯♥ r♠rq sr s ♦r♠s ér♥ts ♦rt♠qs t
♠♣s trs ♦rt♠qs
é♥t♦♥ t ♣r♠èrs ♣r♦♣rétés
❱rétés ♦s②♠♣tqs
qs ①♠♣s rétés P♦ss♦♥ ♦rt♠qs
s♣ s SU(2) ♠♦♥♦♣ôs ♠♥étqs r
s ♠tèrs
♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
èrs ♥rt ♦rt♠qs
trtr èr ♥rt sr ΩA(log I) ♥t ♣r♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I.
♦♥strt♦♥ é♦♠étrq ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
qs strtrs èr ss♦és ① strtrs
P♦ss♦♥ ♦rt♠qs
trtrs èr ♥rt sr ΩX(logD)
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠qs s str
trs ♦s②♠♣tqs
♦♦♠♦♦ P♦ss♦♥ t P♦ss♦♥ ♦
rt♠q strtr P♦ss♦♥ x, y = 0, x, z =
0, y, z = xyz sr A = C[x, y, z]
Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
qs ♣r♦♣rétés s strtrs ♦s②♠♣tqs
♦♥♥①♦♥ ♦rt♠q
♥trté s ♦r♠s ♦rt♠qs r♠és
Préq♥tt♦♥ s strtrs P♦ss♦♥ ♦rt♠qs
qs r♠rqs sr ♦♦♠♦♦ s rétés P♦ss♦♥
♦rt♠qs
ss r♥P♦ss♦♥ ♦rt♠q
①♠♣s ♣♣t♦♥s
Préq♥tt♦♥ (C2, π = z1∂z1 ∧ ∂z2)
Préqtt♦♥ CP1 ♠♥ strtr
P♦♥ts ét qqs é♠♦♥strt♦♥s
s ♣♦♥ts s qqs s
s strtr f, g = xyzdf ∧ dg ∧ dpdx ∧ dy ∧ dz
♦♥tr♦♥s q ∂1 ∂0 = 0
♦♥tr♦♥s q ∂2 ∂1 = 0
s strtr P♦ss♦♥ x, y = x.
♦r♣
♣tr
♥tr♦t♦♥ é♥ér
♦♠♠r st ès
t ès
ts t ♠ét♦s tr
♦♥strt♦♥ ♠♦ s ér♥ts ♦r♠s ♦rt
♠qs
trtrs P♦ss♦♥ ♦rt♠qs t ♦♦♠♦♦ P♦s
s♦♥ ♦rt♠q
Préq♥tt♦♥ ♦rt♠q
s réstts ♣r♥♣①
♦♥strt♦♥ s èrs P♦ss♦♥ ♦rt♠qs
♦♥strt♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q t
qqs ①♠♣s
♣♣t♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦tés
r s ♦r♠s ér♥ts ♦rt♠qs
r s strtrs P♦ss♦♥ ♦rt♠qs t ♥r♥ts ♦
♦♠♦♦qs
Prs♣ts
r s èrs P♦ss♦♥ ♦rt♠qs
r s ♦r♠s ér♥ts ♦rt♠qs
r q♥tt♦♥
st ès
♦t X ♥ rété ♦♠♣① ♠♥s♦♥ ♥ n t D ♥ sr rét
X éqt♦♥ h = 0 ♦ù h st r♠ ♥ ♦♥t♦♥ ♦♦♠♦r♣ ♥ ♥♦t OX
s s r♠s ♦♥t♦♥s ♦♦♠♦r♣s sr X. ❯♥ strtr P♦ss♦♥
♦♦♠♦r♣ sr X st ♦♥♥é ♥ r♦t −,− q ss♥ à ♥ ♦♣ (f, g)
r♠s ♦♥t♦♥s ♦♦♠♦r♣s ♥ ♥ ♣♦♥t x X ♥ r♠ f, g ♦♥t♦♥
♦♦♠♦r♣ ♥ x ér♥t s ♣r♦♣rétés s♥ts
• −,− st ♥ér ♥ts②♠étrq
• f, g, h+ g, h, f+ h, f, g = 0 ♥tté ♦
♣tr ♥tr♦t♦♥ é♥ér
• f, gh = f, gh+ f, hg rè ♥③
r♥t ♠ê♠ é♥r ♥ ♠♣ trs q ♦♥ ♣t érr ♥s ♥
s②stè♠ ♦♦r♦♥♥és ♦s
P =1
2
∑1≤i,j≤n
Pij(x)∂
∂xi∧ ∂
∂xj
=∑
1≤i<j≤nPij(x)
∂
∂xi∧ ∂
∂xj Pij = −Pji
t q ér ♥tté ♦
∑
1≤i<j≤n
(Pil∂Pjk∂xl
+ Pjl∂Pki∂xl
+ Pkl∂Pij∂xl
) = 0
♣♦r 1 ≤ i, j, k ≤ n. ♥ é♥t ♦rs r♦t P♦ss♦♥ ♦♦♠♦r♣ ♣r
f, g := 〈P, df ∧ dg〉 =∑
1≤i<j≤n
Pij(x)(∂f
∂xi
∂g
∂xj− ∂g
∂xi
∂f
∂xj).
ts strtrs ♥s♥t ♦r ❬P♦s ❪ ♥ ♦♠♦♠♦r♣s♠ OX
♥ér H : ΩX → DerX(OX) t q H(df)(g) = f, g. H st ♣♣é ♣♣
t♦♥ ♠t♦♥♥♥ ss♦é à P. ♠t♦♥♥ ss♦é à t♦t r♠ ♦♥t♦♥
♦♦♠♦r♣ f rt♠♥t à P st r♠ ♠♣ tr é♥ ♣r
Xf = H(df) =n∑
i=1
xi, f∂
∂xi.
Pr rs ♥ r♠ ♠♣ trs δ st t ♦rt♠q ♦♥ D
♦r ❬t♦ ❪ s δ(h) ∈ hOX . ♥ ♥♦t DerX(logD) s r♠s
♠♣ trs ♦rt♠qs ♦♥ D. ♥ ♠♦♥tr q DerX(logD) st
st ♣♦r r♦t ♠♣ trs
❯♥ strtr P♦ss♦♥ ♦♦♠♦r♣ P sr X sr t ♦rt♠q ♦♥ D
s ♠t♦♥♥ ss♦é à t♦t r♠ ♦♥t♦♥ ♦♦♠♦r♣ f st ♥ st♦♥
DerX(logD). ts strtrs P♦ss♦♥ s♦♥t ♥ é♥érst♦♥ s strtrs
P♦ss♦♥ ♥ts ♣r s strtrs ♦s②♠♣tqs ♦s r♣♣♦♥s q s ♥
♦tr ♠♥s♦♥ X st ♣r ♥ ♦r♠ ♠ér♦♠♦r♣ ω st t ♦s②♠♣
tq sr X s st ♦rt♠q r♠é t ♥♦♥ éé♥éré ♥s s ω st ♥
♦r♠ ♦s②♠♣tq sr X, ♦rs ♣♦r t♦t r♠ ♦♥t♦♥ ♦♦♠♦r♣ f, g,
r♦t
f, g = ω(Xf , Xg)
♦ù iXfω = −df st P♦ss♦♥ ♥ ♣♣ r♦t P♦ss♦♥ ♦s②♠♣tq
s strtrs ♦s②♠♣tqs s♦♥t tsés à s ♥ rss ♥s s réér♥s
❬r ❱rr ❪ ❬♦t♦ ❪ t ❬t♦ ❪
t ès
t ès
♦s ♦ts s♦♥t
• ♥tr♦r s ♥♦t♦♥s èr P♦ss♦♥ t rété P♦ss♦♥ ♦rt♠q
• r♠♣r ♥s ♣r♦sss ♣réq♥t♦♥ s♣ s ♣ss ssqs
♣r ♥ rété P♦ss♦♥ ♦rt♠q
• ♥tr♦r s ♦♦♠♦♦s P♦ss♦♥ ♦rt♠q t s♥ srr ♣♦r
étr ♣réq♥tt♦♥ t②♣ rété
♣♦♥t ♠té♠tq ♣réq♥tr ♥ rté s②♠♣tq (X,ω) st
étr ♥ ♦rrs♣♦♥♥ ϕ ♥tr èr (F(X) ⊂ C∞(X), −,−) s
♦srs ssqs t ♥ s♣ rt H à ♦♥strr ♦ù −,− és♥
strtr P♦ss♦♥ ♥t ♣r ω ♣rès r tt ♦rrs♣♦♥♥ ♦t
stsr s ♣r♦♣rétés s♥ts
ϕ st t
s f st ♥ ♦sr ♦♥st♥t ♦rs ϕ(f) st ♠t♣t♦♥ ♣r f.
[f1, f2] = f3 ♦rs ϕ(f1)ϕ(f2) − ϕ(f2)ϕ(f1) = −ihϕ(f3) ♦ù h és♥ ♦♥
st♥t P♥
tr♠♥t t ϕ ♦t r♥r ♦♠♠tt r♠♠ èrs ♥rt
s♥t
0 // F(X)m // +
1 (Γ(L))σ // DerX // 0
0 // R //
OO
(F(X), ω)
ϕ
OO
// Ham(F(X))
OO
// 0.
♦♥ ♦r ❬❯r♥ ❪
ϕ(as) = ∇v(a)s+ 2iπas
♦ù ∇ és♥ ♦♥♥①♦♥ sr ♥ ré ♥ r♦t ♦♠♣① p : L→ X t +1 (Γ(L))
♠♦ s ♦♣értrs ér♥ts ♦rr ♥érr ♦ é à 1 sr ♠♦ s
st♦♥s L.
ts t ♠ét♦s tr
②♥t ♠♦é ♥tr s s♣s ♣ss ♦♥♥t ♣♣♦rtr s ♠♦
t♦♥s s♦t sr s t♥qs ss s♦t s ♦♥srr t ♠♦r s ♦ts
♦s ♦♣t♦♥s ♣♦r r♥èr ♠ét♦ P♦r ♥♦s ♥tr♦s♦♥s ♥♦t♦♥
♦♦♠♦♦ P♦ss♦♥ ♦rt♠q râ à q ♥♦s ♠sr♦♥s ♦strt♦♥
à ①st♥ H
♦s r♣rtss♦♥s tr ♦♠♠ st
♣tr ♥tr♦t♦♥ é♥ér
♦♥strt♦♥ ♠♦ s ér♥ts ♦r♠s ♦rt♠qs
Prt♥t ♥ é ♣r♦♣r I ♥♥ré ♣r ♥ ♣rt S = u1, ..., up ♥
èr ♦♠♠tt t ♥tr A ♥té 1A ♥♦s ♦♥sér♦♥s A♠♦ ♥
♥ré ♣r ΩA ∪ duiui, i = 1, ..., p, ♦ù ΩA és♥ A♠♦ s ér♥ts
är A. ♦s ♥♦t♦♥s ΩA(log I) t ♣♣♦♥s ♠♦ s ér♥ts
är ♦rt♠qs ♦♥ I. ♦s r♣♣♦♥s q♥ ért♦♥ δ sr Ast t ♦rt♠q ♦♥ I s δ(I) ⊂ I. ♥ és♥ ♣r DerA(log I) A
♠♦ s ért♦♥s ♦rt♠qs ♦♥ I. Pr ♦♥strt♦♥ DerA(log I)st ♥ s♦s èr DerA. ♦s ♦♥sér♦♥s s♦s ♠♦ DerA(log I) DerA(log I) ♦r♠é s δ ts q δ(ui) ∈ uiA ♣♦r t♦s ui ∈ S. ♦s ♣
♣♦♥s ♠♦ s ért♦♥s ♦rt♠qs ♣r♥♣s ♦♥ I. ♦s ♠♦♥
tr♦♥s ♠♠ q DerA(log I) st ΩA(log I).
trtrs P♦ss♦♥ ♦rt♠qs t ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
❯♥ ♦s s ér♥ts ♦r♠s ♦rt♠qs ♦♥strts ♥♦s ♥tr♦s♦♥s
s strtrs P♦ss♦♥ ♦rt♠qs P♦r ♥♦s r♣♣♦♥s q♥ strtr
♦s②♠♣tq sr ♥ rété ♦♠♣① X ♠♥s♦♥ 2n st ♦♥♥é ♥
st♦♥ ω Ω2X(logD) s s r♠s ♦r♠ ér♥t ♦rt♠q
♦♥ ♥ sr rét D X stss♥t s ♣r♦♣rétés s♥ts
ω st r♠é
ωn = ω ∧ ... ∧ ω 6= 0 ♥s H0(X,Ω2n([D])).
♦♥t♦♥ ♠♦♥tr q ♣♦r t♦t r♠ f ♦♥t♦♥ ♦♦♠♦r♣ sr X,
①st ♥ ♥q ♠♣ tr ♦rt♠q δf t q ıδfω = df. ♥ ♦♥sèr
♦rs r♦t f, gω = ω(δf , δg).
s ♣r♦♣rétés t ♦♥ ♠♦♥tr q −,−ω st ♥ strtr P♦s
s♦♥ ♦♦♠♦r♣ ♦rt♠q ♦♥ D. ♦s rst♦♥s ♥♦t♦♥ èr
♥rt t ♥tr♦s♦♥s èr ♥rt ♦rt♠q ♥ r
♥ strtr èr ♥rt ρ : L→ DerA st t ♦rt♠q ♦♥
I s ρ(L) st ♥ s♦s ♠♦ DerA(log I). ♦s ♠♦♥tr♦♥s q t♦t strtr
P♦ss♦♥ ♦rt♠q ♣r♥♣ ♥t sr ΩA(log I) ♥ strtr èr ♥rt ♦rt♠q ♣r s s♦♥ ♣♣t♦♥ ♠t♦♥♥♥ P♦r
♥♦s ♦♥strs♦♥s sr ΩA(log I) ♥ strtr èr ♣r♦♦♥♥t
strtr P♦ss♦♥ ♥t sr ΩA. tt strtr s é♥t sr s é♥értrs
ΩA(log I)− ΩA. Pr
[adu
u, bdv
v] =
a
uu, bdv
v+b
va, vdu
u+ abd(
1
uvu, v).
♥ ♦♥strt ♥s ♥ r♣rés♥tt♦♥ ΩA(log I) ♣r s ért♦♥s ♦rt
♠qs ♦♥ I. ♦♦♠♦♦ tt r♣rés♥tt♦♥ s♣♣ ♦♦♠♦♦
s réstts ♣r♥♣①
P♦ss♦♥ ♦rt♠q ♦s ♠♦♥tr♦♥s q tt ♦♦♠♦♦ st s♦♠♦r♣ à
♦♦♠♦♦ ♠ ♦rt♠q q st s♦♠♦r♣ à ♦♦♠♦♦
P♦ss♦♥ ss♦é ♦rsq strtr P♦ss♦♥ ♦rt♠q ♦♥séré é♦
♥ strtr ♦s②♠♣tq ♠♦②♥ qqs ①♠♣s ♥♦s ♠♦♥tr♦♥s
q♥ é♥ér s ♦♦♠♦♦s P♦ss♦♥ t s P♦ss♦♥ ♦rt♠qs s♦♥t
ér♥ts
Préq♥tt♦♥ ♦rt♠q
♦t ♦r ♥♦s r♠♣ç♦♥s ♥s sé♠ ♣réq♥tt♦♥ r
rété s②♠♣tq ♣r ♥ rété ♦s②♠♣tq (X,D, ω) ♥♦s ♣♦ss à
étr ①t♥s♦♥ s HωX s r♠s ♠♣s trs ♦rt♠qs
♦♠♥t ♠t♦♥♥s rt♠♥t à ω. ♦s r♠♣ç♦♥s ①è♠ ♥
r♠♠ ♣r
0 // CX // (OX , ω) // HωX
// 0
t ♣r♠èr ♣r
0 // OXm // +1 (logD)
σ // DerX(logD) // 0
♦ù +1 (logD) és♥ s r♠s ♦♣értrs ér♥t ♦rt♠qs
♦♥ D. ♥ ♦♥sr♥t ♦r♠ ♥♦s ♥♦s sr♦♥s ♦♦♠♦♦
♠ ♦rt♠q ♣♦r étr ♥térté s ♦r♠s ♦s②♠♣tqs ♦s
♥tr♦s♦♥s ♥♦t♦♥ ért♦♥ ♦♥trr♥t ♦rt♠q à q
♥♦s é♥ss♦♥s ♥♦t♦♥ ss r♥ P♦ss♦♥ ♦rt♠q ♦s ♥♦s ♥
sr♦♥s ♣♦r ♥tr♦r ♥♦t♦♥ ♣réq♥tt♦♥ ♦rt♠q ♦s é♠♦♥
tr♦♥s ♥ té♦rè♠ ♥térté s strtrs P♦ss♦♥ ♦rt♠q ♠♦②♥
♦♦♠♦♦ P♦ss♦♥ ♦rt♠q ss♦é ♥ r s (X,D,Υ) st ♥ r
été P♦ss♦♥ ♦♦♠♦r♣ ♦rt♠q p : L→ X ♥ ré ♥ r♦ts ♦♠♣①s
sr X t Γ(L) s♦♥ ♠♦ st♦♥s ♥ ért♦♥ ♦rt♠q ♦♥trr♥t
Dlog sr p : L → X st ♥ ♣♣t♦♥ C♥ér Ω1X(logD) → EndC(Γ(L)) t
q
Dlogα (fs) = fDlog
α s+ (H(α)f)s
♣♦r t♦t α ∈ Ω1X(logD) t s ∈ Γ(L). ♦s r♠rq♦♥s q s ∇ st ♥ ♦♥♥①♦♥
♦rt♠q sr p : L → X, ♦rs Dα = ∇H(α) st ♥ ért♦♥ ♦♥trr♥t
♦rt♠q sr p : L→ X
s réstts ♣r♥♣①
Prés♥t♦♥s à ♣rés♥t s réstts ss♥ts tt ès
♦t ♦r ♦♥sér♥t sr X = C2 ♦r♠ ω =dy
x♠ér♦♠♦r♣ ♦♥
sr D = 2Y ♦ù Y = (0, y), y ∈ C ♥♦s ♠♦♥tr♦♥s ♥éssté ♠♣♦sr
♣tr ♥tr♦t♦♥ é♥ér
♦♠♠ ②♣♦tès s♣♣é♠♥tr ♦rè♠ ❬t♦ ❪ ♦♥t♦♥ s♦♥
q ♦♥t♦♥ é♥t♦♥ sr ♦t êtr à rré r
♥t s rss ♣rts tr ♥♦s ♦♥s ♦t♥ s réstts s♥ts
♦♥strt♦♥ s èrs P♦ss♦♥ ♦rt♠qs
P♦r t♦t é ♣r♦♣r I ♥ èr ♦♠♠tt ♥tr A ♥♥ré ♣r
S = u1, ..., up ♥♦s ♣♦s♦♥s
DerA(log I) = δ ∈ DerA(log I)δ(ui) ∈ uiA.
st ♠♦ s ért♦♥s ♦rt♠qs ♣r♥♣s ♦♥ I. ♥ ♠♦♥tr
♣tr ♠♠ q
♠♠ DerA(log I) st ΩA(log I).
Pr rs ♥♦s s♦♥s q t♦t strtr P♦ss♦♥ −,− ♦rt♠q sr
A ♦♥ I ♥t ♥ ♣♣t♦♥ H : ΩA → DerA é♥ ♣r H(df) = f,−♣♣é ♣♣t♦♥ ♠t♦♥♥♥ q st ♥ ♦♠♦♠♦r♣s♠ A♠♦s
♣s ♦♥ ♠♦♥tr ♦r ♠♠ q
♠♠ ♣♣t♦♥ ♠t♦♥♥♥ H ss♦é à ♥ strtr P♦ss♦♥
♦rt♠q st à ♠ ♥s DerA(log I).
♥ ♥ ét ss ♠♠ s♥t
♠♠ ♦t S = u1, ...up ♥ st éé♠♥ts A rt♠♥t ♣r
♠èr (ui) 6= (uj) t ui /∈ (uj), uj /∈ (ui) ♣♦r t♦t i 6= j. ♦t −,− ♥
strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I = 〈S〉A.♦rs
1
uiui,− ∈ DerA(log I) t
1
uiujui, uj ∈ A.
♥ ♥ ét q
♦r♦r −,− st ♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣
♦♥ ♥ é I ♥♥ré ♣r ♥ st ♥ éé♠♥ts A rt♠♥t ♣r♠èr
♦rs ♣♣t♦♥ ♠t♦♥♥♥ ss♦é H s ♣r♦♦♥ ♥ ♥ ♦♠♦♠♦r♣s♠
A♠♦s
H : ΩA(log I) → DerA(log I).
♥ ♠♦♥tr ♥ ♣s q H st ♥ ♦♠♦♠♦r♣s♠ èr ♦rsq♦♥ éq♣
ΩA(log I) r♦t é♥ ♠♠
s réstts ♣r♥♣①
♦♥strt♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q tqqs ①♠♣s
♦♥strt♦♥ tt ♦♦♠♦♦ r♣♦sé sr té♦rè♠ s♥t
é♦rè♠ ♦t strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ ♥
é I ♥ Rèr A ♥t sr ΩA(log I) ♥ strtr ♥rt
tr♠♥t t ♣♦r t♦t strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ ♥
é I, (ΩA(log I), H, [−,−]) st ♥ èr ♥rt
♦s és♦♥s té♦rè♠ q t♦t strtr P♦ss♦♥ ♦rt♠q ♥t
♥ r♣rés♥tt♦♥ ΩA(log I) ♣r s ért♦♥s ♦rt♠qs ♦s ♣♣♦♥s
♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q ♦♦♠♦♦ ss♦é à tt r♣rés♥
tt♦♥ ♦s ♥♦t♦♥s HkPS kè♠r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
ttr P t réér♥ à P♦ss♦♥ ♦rs q ttr S t réér♥ à t♦
♦s és♥♦♥s ♣r HkP kè♠ r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦s ♠♦♥tr♦♥s
q strtr P♦ss♦♥ é♥ ♣r x, y = x st ♦rt♠q ♣r♥♣
♦♥ é xC[x, y] t ss r♦♣s ♦♦♠♦♦s s♦♥t
Pr♦♣♦st♦♥ s r♦♣s ♦♦♠♦♦ P♦ss♦♥ x, y = x s♦♥t
H0P∼= C H1
P∼= C t H2
P∼= 0A.
♥ ♠♦♥tr ss q ss r♦♣s ♦♦♠♦♦s P♦ss♦♥ ♦rt♠qs s♦♥t
H0PS
∼= C, H1PS
∼= C t H2PS
∼= 0A.
♥ r♠rq q s ① r♦♣s s♦♥t s♦♠♦r♣s st û t q str
tr P♦ss♦♥ x, y = x st ♦s②♠♣tq ♦r♠ ♦s②♠♣tq ss♦é
ω0 =dx
x∧ dy.
Pr rs ♥♦s ♠♦♥tr♦♥s q x, y = x2 é♥t ♥ strtr P♦ss♦♥ ♦
rt♠q ♦♥ x2C[x, y] q ♥st ♣s ♦s②♠♣tq r ♦r♠
ss♦é stdx
x2∧ dy q ♥st ♣s ♦rt♠q ♦♥ x2C[x, y]. Pr ♦♥tr
♥♦s ♠♦♥tr♦♥s q ss r♦♣s ♦♦♠♦♦s P♦ss♦♥ t P♦ss♦♥ ♦rt
♠q s♦♥t s♦♠♦r♣s t ♦♥♥és ♣r
Pr♦♣♦st♦♥ s r♦♣s ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
x, y = x2 s♦♥t
H1PS
∼= C[y]⊕ C1[x];H2PS
∼= C[y], H0PS
∼= C.
s♥st q t êtr ♦s②♠♣tq ♥st ♣s ♥ ♦♥t♦♥ ♥éssr é
té ♥tr s ① r♦♣s ♦♦♠♦♦
♦s ♠♦♥tr♦♥s ss q strtr P♦ss♦♥ (x, y = 0, x, z = 0, y, z =
xyz) ♥s A = C[x, y, z] st ♦rt♠q ♦♥ xyzC[x, y, z] t q s♦♥
tr♦sè♠ r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q st ♥ s♦s r♦♣
s♦♥ tr♦sè♠ r♦♣ ♦♦♠♦♦ P♦ss♦♥
♣tr ♥tr♦t♦♥ é♥ér
é♦rè♠ tr♦sè♠ r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt
♠q strtr P♦ss♦♥ (A = C[x, y, z], x, y = 0, x, z =
0, y, z = xyz) st
H3P∼= C[y]⊕ zC[z]⊕ xC[x]⊕ xyC[y]⊕ xyC[x]⊕xzC[x]⊕ xzC[z]⊕ yzC[y]⊕ yzC[z],
tr♦sè♠ r♦♣ ♦♦♠♦♦ P♦s♦♥ strtr P♦ss♦♥ (A =
C[x, y, z], x, y = 0, x, z = 0, y, z = xyz) st
H3PS
∼= C[y]⊕ zC[z]⊕ xC[x].
♥ s♦♠♠ ♥♦s ♣♦♦♥s ♦♥r q♥ é♥ér s r♦♣s ♦♦♠♦♦
P♦ss♦♥ ♦rt♠q s♦♥t ♥♦♥ tr① t st♥ts ① P♦ss♦♥ ss♦és
r ♥♦♥ trté r ♣r♠t ♥s ♥ rt♥ ♠sr ♦r rô ss
♥t ♥r♥ts
♦s ♠♦♥tr♦♥s q t♦t strtr ♦s②♠♣tq é♥t ♥ t r
été ♥ s s s②♠♣tqs ♠♥s♦♥ ♥
♣♣t♦♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♣rès ♥ ét ♦♥t♦♥ ♥térté s ♦r♠s ér♥ts ♦rt
♠qs ♥♦s ♥♦s sr♦♥s ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q ♣♦r étr
♣réq♥tt♦♥ s strtrs P♦ss♦♥ ♦s②♠♣tqs ♦s ♣r♦♣♦s♦♥s s
réstts s♥ts
é♦rè♠ ♦t ω ♥ 2♦r♠ ♦rt♠q r♠é ♦♥ ♥ sr
rét D ♥ rété ♦♠♣① X ♠♥s♦♥ 2n. D stst ♣r♦♣rété
é♦rè♠ ♦rs s ♣r♦♣rétés s♥ts s♦♥t éq♥ts
ω =dh
h∧ ψ + η st ♥tér
res(ω) st ①t t ①st [ω0] ∈ H2(X,C) ♥tér t q
[ω0] = [η].
♦s s ②♣♦tèss
D st à r♦s♠♥t ♥♦r♠①
D = ∪j∈IDj st é♦♠♣♦st♦♥ ♥ ♦♠♣♦s♥ts rréts D ♦rs
q Dj st ss I és♥♥t ♥ ♥s♠ ♥s
♦♥sérés ♥s ❬♦t♦ ❪ ♣♦r rtérst♦♥ s sss r♥ ♦rt
♠qs ♥♦s ♠♦♥tr♦♥s q s ∂D és♥ ér♥t P♦ss♦♥ ♦rt♠q
♦rs ♦♥
Pr♦♣♦st♦♥ ♦t (X,D,Υ) ♥ rété P♦ss♦♥ ♦rt♠q ♦♥
♥ sr D stss♥t s ②♣♦tèss t (X,D,Υ) st ♦ ♣réq♥
t s ①st ♥ ♠♣ trs ♦rt♠q δ t ♥ ♦r♠ ♦rt♠q
ω ♥tér t q
Υ+ ∂Dδ = H(ω).
♦tés
♥ r♥♥t à rtérst♦♥ s ♦r♠s ♦rt♠qs ♥térs ♥♦s ♣r♦♦♥s
q
♦r♦r ♦t (X,D,Υ) ♥ rété P♦ss♦♥ ♦rt♠q ♦♥
♥ sr D stss♥t s ②♣♦tèss é♦rè♠ (X,D,Υ) st
♦ ♣réq♥t s ①st ♥ ♠♣ trs ♦rt♠q δ s ♦♥t♦♥s
♦♦♠♦r♣s Ri, i = 1, ..., k t ♥ ♦r♠ ω0 ♦♦♠♦r♣ sr ♥ s♦s rété
♠♥s♦♥ ♥ X ♥tér t q
Υ+ ∂D(δ −k∑
i=1
Ri
hi(H(dhi)) = H(ω0).
♦tés
r s ♦r♠s ér♥ts ♦rt♠qs
♦s ♦♥s s♦♥é à s♦s st♦♥ ♥éssté ♠♣♦sr ♦♥t♦♥
s♦♥ q ♦♥t♦♥ é♥t♦♥ sr ♦t êtr à rré r
♦s ♦♥s ss ♦♥strt ♠♦ s ér♥ts ♦r♠s ♦rt♠qs
♦♥ ♥ é I t ♥♦s ♦♥s rtérsé s♦♥ ♠♦ ♦rsq I st ♥♥ré
♣r ♥ ♥♦♠r ♥ éé♠♥ts èr s♦s♥t
r s strtrs P♦ss♦♥ ♦rt♠qs t ♥r♥ts♦♦♠♦♦qs
tr♠ tt ét ♥♦s s♦♠♠s ♣r♥ à ♠ttr sr ♣ té♦r
P♦ss♦♥ ♦rt♠q ♣s ♥♦s ♦♥s ♠♦♥trr q ♥s s s strtrs
P♦ss♦♥ ♦rt♠qs ♣r♥♣s ♣♣t♦♥ ♠t♦♥♥♥ ss♦é st à ♠
♥s ♠♦ s ért♦♥s ♦rt♠qs t q s ♣r♦♦♥ sr ♠♦
s ér♥ts ♦r♠s ♦rt♠qs ♥s s ♥♦s ♦♥s ♦♥strt sr
♠♦ s ér♥ts ♦r♠s ♦rt♠qs ♥ r♦t ♣r♦♦♥♥t
P♦ss♦♥ ♥t sr ♠♦ s ér♥ts ♦r♠s ♦s ♦♥s
①♣♦té s ♣r♦♣rétés ♣♦r érr ♣♣t♦♥ ♠t♦♥♥♥ ♥t ♣r s str
trs P♦ss♦♥ ♦rt♠qs ♥ strtr èr ♥rt sr ♠♦
s ér♥ts ♦r♠s ♦rt♠qs râ à tt r♥èr ♥♦s ♦♥strs♦♥s
♦♠♣① P♦ss♦♥ ♦rt♠q t ♦♥s qqs r♦♣s ♦♦♠♦♦
s ss♦és ♦s ♦♥s ♠♦♥tré sr s ①♠♣s q s r♦♣s ♦♦♠♦♦
s s♦♥t ♥ é♥érs ér♥ts s r♦♣s ♦♦♠♦♦s P♦ss♦♥ ss♦és
♥ qs ♦ï♥♥t ♦rsq strtr P♦ss♦♥ st ♥t ♣r ♥ strtr
♦s②♠♣tq râ à tt ♥♦ ♦♦♠♦♦ ♥♦s ♦♥s ♥tr♦t ♥♦t♦♥
♣réq♥tt♦♥ ♦rt♠q q ♥♦s ♦♥s é♠♦♥tré ♥ réstt
♣réq♥tt♦♥ ts strtrs ♥♦t♦♥ ért♦♥ ♦♥trr♥t
♦rt♠q
♣tr ♥tr♦t♦♥ é♥ér
Prs♣ts
r s èrs P♦ss♦♥ ♦rt♠qs
♦s ♦♥s ♥tr♦t ♥♦t♦♥ rété P♦ss♦♥ ♦rt♠q t ♦
♦♠♦♦ P♦ss♦♥ ♦rt♠q sr ♥térss♥t étr s ♣r♦♣rétés
érqs s èrs P♦ss♦♥ ♦rt♠q ♥ r♠♣ç♥t sr ♣r ♥
é q♦♥q ♥ èr ss♦t ♦♥♥é ♦s ♦♥s ♦♠♠♥é tt ét
♣tr ♠s ♥♦s ♥♦s s♦♠♠s ♠tés s s strtrs P♦ss♦♥ ♦
rt♠qs ♣r♥♣s sr ♣rtèr♠♥t ♥térss♥t étr s é♥ér
s strtrs P♦ss♦♥ ♦♥t r♦t st ♥ ért♦♥ ♦rt♠q Pr
rs ♦s ♦♥s ♦♥strt ♥s s ♦ù é I st ♥♥ré ♣r ♥ st
♥ éé♠♥ts èr ♠♦ s ér♥ts ♦r♠s ♦
rt♠qs ♥ ♣♦rr rrr s é♥ér ♦ù I st ♥ é q♦♥q ♥
♣♦rr ss rrr ♥♦ ♦rt♠q té♦rè♠ ♦ss♦st♥t
♦s♥r ♥s ❬♦ss t ❪
r s ♦r♠s ér♥ts ♦rt♠qs
qst♦♥ q ♦♥ ♥ ♣t s ♣r♠ttr ♦r st s♦r ♦♠♠♥t
s♦♥t s ♦r♠s ér♥ts ♦rt♠qs ♦♥ s srs ♥♦♥ rét ♥
♣♦rr ♦♥ ♥s ♥ ♣r♦ ♥r s ♣♥r sr st ♣♦r ♦t ♥
♣rt rr s réstts ♥♦s é♦rè♠ ♦♠♣rs♦♥ ♦rt
♠q tr ♣rt rtérst♦♥ s s① s r♠s ♦r♠s ér♥
ts ♦rt♠qs ss♦és t ♥♥ q♥ té♦rè♠ rtérs♥t s srs
♣♦r sqs s s① s♦♥t rs
r q♥tt♦♥
q♥tt♦♥ é♦♠étrq st ssé ♥ ① r♥s ét♣s ♣r♠èr
ét♥t ♣réq♥tt♦♥ ♦s ♥♦s s♦♠♠s ♣s ♦sés sr tt r♥èr ét♣
ét♣ ♣♦rst♦♥ ♠♦②♥ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q rst
♥①♣♦ré Pr rs srt ♥térss♥t rrr ♠♣t ♦♦♠♦♦
P♦ss♦♥ ♦rt♠q sr q♥tt♦♥ ♣r é♦r♠t♦♥
♣tr
r s strtrs P♦ss♦♥
♦rt♠qs
♦♠♠r èrs P♦ss♦♥ ♦rt♠qs
ért♦♥s ♦rt♠qs
ér♥ts ♦r♠s ♦rt♠qs
éré ♣r r♣♣♦rt à ♥ ért♦♥ ♦rt♠q
trtrs èrs P♦ss♦♥ ♦rt♠qs
qs ①♠♣s èrs P♦ss♦♥ ♦rt♠qs
❱rétés P♦ss♦♥ ♦rt♠qs
sr r
❯♥ r♠rq sr s ♦r♠s ér♥ts ♦rt♠qs t
♠♣s trs ♦rt♠qs
é♥t♦♥ t ♣r♠èrs ♣r♦♣rétés
❱rétés ♦s②♠♣tqs
qs ①♠♣s rétés P♦ss♦♥ ♦rt♠qs
s♣ s SU(2) ♠♦♥♦♣ôs ♠♥étqs r
♥tr♦t♦♥
♣tr st ♦♥sré à ♦♥strt♦♥ èrs P♦ss♦♥ ♦rt♠qs
t rétés P♦ss♦♥ ♦rt♠qs P♦r ♥♦s ♦♥strs♦♥s ♠♦ s
ér♥ts ♦r♠s ♦rt♠qs t ét♦♥s qqs ♥s ss ♣r♦♣rétés
èrs P♦ss♦♥ ♦rt♠qs
♥s tt ♣rt ♦♥ és♥r ♣r
• A ♥ èr ss♦t ♦♠♠tt ♥tr t ♥tèr sr ♥ ♦r♣s k
rtérstq
• I ♥ é A,• U r♦♣ ♠t♣t s ♥tés A.• DerA A♠♦ s ért♦♥s A.• ΩA ♠♦ s ér♥ts är A
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
ért♦♥s ♦rt♠qs
é♥t♦♥ ♥ ♣♣ ért♦♥ ♦rt♠q ♦♥ ♥ é I A t♦t
éé♠♥t D DerA t q D(I) ⊂ I.
♥ ♥♦tr DerA(log I) ♥s♠ s ért♦♥s A ♦rt♠qs ♦♥ IP♦r t♦s D1, D2 ∈ DerA(log I) ♦♥
D1(D2)(I) ⊂ I.
♥ ♥ ét q DerA(log I) st st ♣♦r r♦t s ért♦♥s
A.
♠♠ DerA(log I) st ♥ s♦s èr DerA.
♦t S = u1, ..., up ♥ s♦s ♥s♠ à p éé♠♥ts A− U .♥ s♣♣♦s ♥s st q I st ♥♥ré ♣r S t ♦♥ és♥r ♣r uA é
A ♥♥ré ♣r u ∈ S.
é♥t♦♥ S st t rt♠♥t ♣r♠r s s é① uiA t ujA s♦♥t ♣r♠rs
t ♥trst♦♥ tr ♣♦r t♦t i, j ts q i 6= j
P♦s♦♥sDerA(log I) := D ∈ DerA(log I);D(ui) ∈ uiA; ♣♦r t♦t ui ∈ S.
P♦r t♦s D ∈ DerA(log I) t ui ∈ S, ♦♥
D(ui)
ui∈ A.
Pr rs ♣♦r t♦s D1, D2 ∈ DerA(log I) ♦♥
D1(D2(ui)) = D1(uib2) ♦ù D2(ui) = uib2= uiD1(b2) + b2D1(ui)
= ui(D1(b2) + b2b1) ♦ù D1(ui) = uib1
P♦r t♦t i = 1, ..., p. ♦♥ DerA(log I) st st ♣♦r r♦t s ér
t♦♥s A. ♦ù ♠♠ s♥t
♠♠ DerA(log I) st ♥ s♦s èr DerA(log I).
é♥t♦♥ s éé♠♥ts DerA(log I) s♦♥t ♣♣és ért♦♥s ♦rt♠qs
♣r♥♣s ♦♥ I.
ér♥ts ♦r♠s ♦rt♠qs
P♦s♦♥s MA té♦r s A♠♦s
Pr♦♣♦st♦♥ ♥♦♦♥tr Der(A,−) MA st r♣rés♥t
èrs P♦ss♦♥ ♦rt♠qs
Pr ♣rès ♣r♦♣rété ♥rs ♣r♦t t♥s♦r A⊗A ♣♣t♦♥
m : A⊗A → A(a, b) 7→ ab
♥t ♣r ♣r♦t A, st ♥ ♦♠♦♠♦r♣s♠ kèrs ♥ ♣♦s ker(m) =
I t ♦♥ ♠♦♥tr q I st ♥As♦s ♠♦ A⊗A ♥♥ré ♣r a⊗1A−1A⊗a, a ∈A. s ♠♦s q♦t♥ts B = A⊗A/I2 t ΩA = I/I2 s♦♥t ♦♥ ♥ é♥s
tr ♣rt a = m(1⊗a) ♣♦r t♦t a ∈ A. ♦♥ m ♥t ♥ s♦♠♦r♣s♠
A ⊗A/I ≃ A q à s♦♥ t♦r ♥t ♥ é♣♠♦r♣s♠ m : B → A → 0. ♥ ♦♥
st ①t ♦rt s♥t
0 → ΩA → B → A→ 0.
Pr rs s ♠♦r♣s♠s
λ1 : A → B, a 7→ a⊗ 1 + I2λ2 : A → B, a 7→ 1⊗ a+ I2
ér♥t s étés s♥ts mλ1 = mλ2 = 1A. s♦♥t ♦♥ s st♦♥s tt
①t♥s♦♥ ♣s s étés mλ1 = mλ2 = 1AA s♥st q λ1 t λ2 s♦♥t s
rè♠♥ts 1A ♦♥ λ1 − λ2 = d st ♥ éé♠♥t Der(A,ΩA)
P♦r r ♣r ♥♦s ♦♥s ♠♦♥trr q (ΩA, d) st ♥rs
♦t D ∈ Der(A,M) ♣♣t♦♥ ϕ : A⊗A →M ⊕A
x⊗ y 7→ (xy, xDy) = (m(x⊗ y), xDy)
st ♥ ♦♠♦♠♦r♣s♠ kèrs q st A♥ér
Psq m(∑xi ⊗ yi) =
∑xiyi = 0 ♣♦r t♦t
∑xi ⊗ yi ∈ I, ♦rs rstrt♦♥
ϕ : ϕ |I : I −→ M st A♥ér ♣s t q ϕ(I2) = 0 ♠♣q I2 ⊂ ker ϕ.
s♥st q ϕ ♥t ♥ ♦♠♦♠♦r♣s♠ f : ΩA −→ M t q f π = ϕ ♦ù π
és♥ ♣r♦t♦♥ ♥♦♥q I sr I/I2. Pr rs ♣♦r t♦t a ∈ A, ♦♥
f(da) = f(1⊗ a− a⊗ 1 + I2)
= ϕ(1⊗ a− a⊗ 1)
= Da
è é♠♦♥strt♦♥
é♥t♦♥ ΩA st ♣♣é ♠♦ s ér♥ts ♦r♠s
Pr♦♣♦st♦♥ ♠♦♥tr q ♣♦r t♦t A♠♦ M, ①st ♥ s♦♠♦r
♣s♠ σM : Hom(ΩA,M) ∼= Der(A,M). ♥s st s♦♠♦r♣s♠ σA :
Hom(ΩA,A) ∼= Der(A) sr ♥♦té σ.
ér♥ts ♦rt♠qs
é♥t♦♥ ♥ ♣♣ ♠♦ s ♦r♠s ér♥ts ♦rt♠qs ♦♥
I A♠♦ DerA(log I).
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
♥ ♣♦s
ΩA(log I)
A♠♦ ♥♥ré ♣r
duiui, ui ∈ S, i = 1, ..., p
∪ ΩA.
é♥t♦♥ ΩA(log I) st ♣♣é ♠♦ s ér♥ts ♦r♠s A ♦
rt♠qs ♦♥ I.
♦t δ ∈ DerA(log I). ♣rès ♣r♦♣♦st♦♥ δ ♥t ♥ ♣♣t♦♥ A
♥ér
σ(δ) : ΩA → A
t q
σ(δ) d = δ.
♦♥ ♣♦r t♦t u ∈ S, ①st ϕ(u) ∈ A t q
σ(δ)(du) = δu = uϕ(u)
t ♦♥1
uσ(δ)(du) = ϕ(u) ∈ A.
♥ ♣♣t♦♥ ♥ér s♥t
σ(δ) : ΩA(log I) −→ Aadu
u+ bdf 7→ a
1
uσ(δ)(du) + bσ(δ)(df).
ér σ(δ1 + gδ2)(adu
u+ bdf) = σ(δ1)(a
du
u+ bdf) + gσ(δ2)(
du
u+ bdf).
♥t ♦♥ ♥ ♣♣t♦♥ A♥ér
σ : DerA(log I) −→ HomA(ΩA(log I),A)
δ 7→ σ(δ) : adu
u+ bdf 7→ a
1
uσ(δ)(du) + bσ(δ)(df)
q st ♥ s♦♠♦r♣s♠
♥ t ♣♦r t♦t f ∈ HomA(ΩA(log I),A) ♦♥ f d ∈ DerA(log I).♥ ♦♥sèr ♦♠♦♠♦r♣s♠ A♠♦s
ψ : HomA(ΩA(log I),A) → DerA(log I)f 7→ f d.
P♦r t♦t δ ∈ DerA(log I) ♦♥
ψ σ(δ) = ψ(σ(δ))
= σ(δ) d= δ.
èrs P♦ss♦♥ ♦rt♠qs
♦♥ ψ σ = id DerA(log I).
♠ê♠ ♣♦r t♦s f ∈ HomA(ΩA(log I),A) t u ∈ S ♦♥
[(σ ψ)(f)](du) = [σ(ψ(f))](du)
= [σ(f d)](du)= σ(f d)(du)= (f d)u= f(du)
Pr rs[(σ ψ)(f)](duu ) = σ(f d)(duu )
=1
u(σ(f d)(du))
=1
uσ(f d) d(u)
=1
u(f d)(u)
= f(duu ).
♣♦r t♦t u ∈ S.♦♥
(σ ψ)(f) = f ♣♦r t♦t f ∈ HomA(ΩA(log I),A). t ♦♥ σ ψ =
idHomA(ΩA(log I),A). ♣r♦ ♠♠ s♥t
♠♠ DerA(log I) st ΩA(log I).P♦r t♦s fda ∈ ΩA t δ ∈ DerA ♦♥
σ(δ)(fda) = f(σ(δ) d)(a)= fδ(a).
♥ ♦♥sèr ♣♣t♦♥
θ : ΩA → Hom(DerA,A)
ω 7→ θ(ω) : δ 7→ σ(δ)(ω)
θ st ♣r ♦♥strt♦♥ ♥ ♦♠♦♠♦r♣s♠ A♠♦s
Pr rs ♣♦r t♦s δ ∈ DerA(log I) t u ∈ Sθ(du)δ = σ(δ)(du)
= (σ(δ) d)u= δ(u) ∈ uA.
♦♥1
uθ(du)(δ) ∈ A ♣♦r t♦t δ ∈ DerA(log I) t u ∈ S.
θ ♥t ♦♥ ♥ ♦♠♦♠♦r♣s♠ A♠♦s
Θ : ΩA(log I) −→ Hom( DerA(log I),A)
fdu
u+ gda 7→ f
uθ(du) + gθ(da)
q s ♣r♦♦♥ ♥ ♦♠♦♠♦r♣s♠ èrs rés
Θ :∧ΩA(log I) −→ Lalt( DerA(log I),A)
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
éré ♣r r♣♣♦rt à ♥ ért♦♥ ♦rt♠q
♥ ♥♦t∧
A[ΩA(log I)] :=⊕n∈N
∧nA[ΩA(log I)] Aèr ①térr A
♠♦ ΩA(log I). ért♦♥
d : A → ΩA
♦♥ ét ért♦♥
d : A → ΩA(log I) a 7→
da s a ∈ A− I∗
ada
as a ∈ I∗
d s ♣r♦♦♥ ♥ ♥ ért♦♥ éré
d :∧
A
[ΩA(log I)] →∧
A
[ΩA(log I)]
t q ♦♣ (∧
A[ΩA(log I)], d) s♦t ♥ ♦♠♣① ér♥t
P♦r t♦t δ ∈ DerA(log I) t t♦t ♥tr p ≥ 1 ♣♣t♦♥
σδ : [ΩA(log I)]p →∧
A
[ΩA(log I)], (ω1, ..., ωp) 7→p∑
i=1
(−1)i−1σ(δ)(ωi)ω1∧ω2∧...∧ωi∧...ωp
st A♠t♥ér tr♥é ♥ ♥♦t
iδ :∧
A
[ΩA(log I)] →∧
A
[ΩA(log I)]
♥q ♣♣t♦♥ A♥ér t q
iδ(ω1 ∧ ω2 ∧ ... ∧ ωp) 7→p∑
i=1
(−1)i−1σ(δ)(ωi)ω1 ∧ ω2 ∧ ... ∧ ωi ∧ ...ωp
♣♦r t♦t p
♠♠ ♣♣t♦♥ iδ st ♥ ért♦♥ ré −1
Pr ♣r st s♠♣ t rt
é♥t♦♥ ♦♣értr ré ③ér♦ Lδ := iδ d + d iδ st ♣♣é éré
♣r r♣♣♦rt à ért♦♥ ♦rt♠q δ.
♣r♦♣♦st♦♥ s♥t ♦♥♥ qqs ♣r♦♣rétés Lδ
Pr♦♣♦st♦♥ P♦r t♦t δ ∈ DerA(log I), ω ∈ ΩA(log I) t a ∈ A, ♦♥
Laδ(ω) = aLδ(ω) + (σ(δ))(ω)d(a)
Lδ(aω) = δ(a).ω + aLδω Lδ(d(a)) = d[δ(a)]
èrs P♦ss♦♥ ♦rt♠qs
Pr
P♦r t♦t a ∈ A t ω ∈ ΩA(log I), ♦♥
Laδ(ω)= iaδ(d(ω)) + d(iaδ(ω))
= aiδ(d(ω)) + d(aiδ(ω))
= aiδ(d(ω)) + iδ(ω)d(a) + ad(iδ(ω))
= aLδω + σ(δ)(ω)d(a)
P♦r t♦s a ∈ A t ω ∈ ΩA(log I), ♦♥
Lδ(aω)= iδ(d(aω)) + d(iδ(aω))
= iδ(ad(ω) + da ∧ ω) + d(aiδ(ω))
= aiδ(d(ω)) + iδ(d(a) ∧ ω) + ad(iδω) + iδ(ω)d(a)
= aiδ(d(ω)) + σ(δ)(d(a))ω − σ(δ)(ω)d(a) + ad(iδ(ω)) + σ(δ)(ω)d(a)
= aLδω + σ(δ)d(a)ω
P♦r t♦t a ∈ A, ♦♥
Lδ(d(a)= iδ(d(d(a))) + d(iδ(d(a)))
= d(iδ(d(a)))
= d(σ(δ) d(a))
trtrs èrs P♦ss♦♥ ♦rt♠qs
trtrs èrs P♦ss♦♥
❯♥ èr P♦ss♦♥ st ♥ èr ss♦t A ♠♥ ♥ ♣♣t♦♥
♥ér −,− ♥ts②♠étrq ér♥t s ① ♣r♦♣rétés s♥ts
a, b, c+ b, c, a+ c, a, b = 0 ♥tté ♦
a, bc = ba, c+ ca, b ♣r♦♣rété ♥③
♥ ♥ ét ♦♥ q ♣♦r t♦t a ∈ A ♣♣t♦♥
ada : A → A, b 7→ a, b
st ♥ ért♦♥ sr A. ♣s ♣♦r t♦s a, b ∈ A, ♦♥
adab(x) = ab, x = ab, x+ ba, x
s♥st q ♣♣t♦♥ ad : A → DerA, a 7→ ada st ♥ ért♦♥ sr
A à rs ♥s A♠♦ DerA. ♥t ♣rès ♣r♦♣♦st♦♥ ♥
♦♠♦♠♦r♣s♠ A♠♦s
H : ΩA → DerA
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
t q H d = ad.
H st ♣♣é ♣♣t♦♥ ♠t♦♥♥♥ ss♦é à −,−.♥ ♥ ét ♥ ♦♠♦♠♦r♣s♠ A♠♦s
−σ H : ΩA → Hom(ΩA,A)
à ♣rtr q ♦♥ é♥t ♣♣t♦♥
ω : ΩA × ΩA → A, (x, y) 7→ −[(σ H)(x)]y
ω st ♥ ♦r♠ A♥ér tr♥é
♥ t ♣♦r t♦t x =∑
j∈J ;J♥
ajdbj ∈ A, ♦♥
ω(x, x) = −[σ H)(x)](x)
= −∑
j∈J ;J♥
aj [σ(H(x))]dbj
= −∑
j∈J ;J♥
aj [H(x)]bj
= −∑
j∈J ;J♥
aj∑
k∈J ;J♥
ak[H(dbk)]bj
= −∑
j∈J ;J♥
aj∑
k∈J ;J♥
ak[ad(bk)]bj
= − ∑j,k∈J ;J♥
ajakbk, bj
= 0
ω st ♣♣é ♦r♠ P♦ss♦♥ ss♦é à −,−.♦rsq A és♥ èr C∞(M) s ♦♥t♦♥s ér♥ts sr ♥ rété
P♦ss♦♥ M, ω st ♣♣é t♥sr P♦ss♦♥ ♦ tr P♦ss♦♥
Pr rs ♣♦r t♦t a, b ∈ A ♦♥
ω(da, db) = −[σ(H(da))](db)
= −[σ(H(da))] d(b)= −H(da)b
= −a, b
t ♣r stLH(da)db = d(iH(da)db)
= d(H(da)b)
= d(H(da)b)
= da, b
Pr♦♣♦st♦♥ P♦r t♦t èr P♦ss♦♥ A ♦r♠ P♦ss♦♥ ω, ♣
♣t♦♥
[−,−] : ΩA × ΩA −→ ΩA
(x, y) 7→ d(ω(x, y)) + LH(x)y − LH(y)x
é♥t ♥ strtr kèr sr ΩA. ♣s
èrs P♦ss♦♥ ♦rt♠qs
[x, ay] = (H(x))(a)y + a[x, y]
s ♣♣t♦♥s
d : A → ΩA
t
H : ΩA → DerA
s♦♥t s ♦♠♦♠♦r♣s♠s kèrs
s♥st q t♦t strtr P♦ss♦♥ −,− ♥t sr ΩA ♥ strtr
èr ♥rt ♥ ♣rtr ♣♦r x = adu, y = bdv ∈ ΩA ♦♥
♥ ♣rt
d(ω(adu, bdv)) = −d(abu, v) = −au, vdb− bu, vda− abdu, v,
tr ♣rt
LH(adu)bdv = au, bdv + abd(u, v) + bu, vdaLH(bdv)adu = bv, adu+ abd(v, u) + av, udb.
♦♥
[adu, bdv] = −au, vdb− bu, vda− abdu, v+ au, bdv+abd(u, v) + bu, vda− bv, adu− abd(v, u)− av, udb.
t ♣r st
[adu, bdv] = au, bdv + ba, vdu+ abdu, v.
trtr P♦ss♦♥ ♦rt♠q
♣rès q ♣réè t♦t strtr P♦ss♦♥ ♥s A st ♥ ért♦♥
sr A t DerA(log I) st ♥ s♦s èr DerA.
é♥t♦♥ ❯♥ strtr P♦ss♦♥ −,− sr A st t ♦rt♠q ♦♥
I s st ♥ ért♦♥ ♦rt♠q ♦♥ I
♦t −,− ♥ strtr P♦ss♦♥ ♦rt♠q ♦♥ I. P♦r t♦s a ∈ At u ∈ I ♦♥
a, u ∈ A, I ⊂ I♦♥ a,− st ♥ ért♦♥ ♦rt♠q ♦♥ I s♥st ♦♥ q ♣♦r
t♦t a ∈ A,H(da) = a,− ∈ DerA(log I).
♠♠ ♣♣t♦♥ ♠t♦♥♥♥ H t♦t strtr P♦ss♦♥ ♦
rt♠q st à rs ♥s DerA(log I).
é♥t♦♥ ❯♥ strtr P♦ss♦♥ −,− sr A st t ♦rt♠q ♣r♥
♣ ♦♥ I s ♣♦r t♦t u ∈ Su,− ∈ DerA(log I).
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
♦s r♠rq♦♥s q s −,− st ♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣
♦♥ I, ♦rs ♣♦r t♦t x ∈ S ①st ♥ ♣♣t♦♥ ϕx : A → A t q
x, a = xϕx(a)
♣♦r t♦t a ∈ A. ♥s s −,− st ♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥
♣ ♦♥ I ♦rs ♣♦r t♦s x ∈ S t a, b ∈ A, ♦♥
x, ab = ax, b+ bx, a= x(aϕx(b) + bϕx(a))
t
x, ab = xϕx(ab)
♦♥
ϕx(ab) = aϕx(b) + bϕx(a).
Pr rs ♣♦r t♦s x, y ∈ S ♦♥
xϕx(y) = x, y = −yϕy(x). ♣s I st ♣r♠r ♦rs ①st bxy ∈ I t q
x, y = xybxy.
♥ ♥ ét q
ϕx(ay) ∈ yA.P♦r t♦s a ∈ A t y ∈ S. ♣s I st ♣r♠r ♦rs ϕx ∈ DerA(log I) ♣♦r
t♦t x ∈ S.♥ ♥ ét ♠♠ s♥t
♠♠ ♦t S = u1, ...up ♥ s♦s ♥s♠ A rt♠♥t ♣r♠r
(ui) 6= (uj) t ui /∈ (uj), uj /∈ (ui) ♣♦r t♦t i 6= j. ♦t −,− ♥ strtr
P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I = 〈S〉A.♦rs
1
uiui,− ∈ DerA(log I) t
1
uiujui, uj ∈ A
♥ s♣♣♦s q♥ ♣s s éé♠♥ts S s♦♥t rt♠♥t ♣r♠rs q ♠♣q
q ♣♦r t♦t u ∈ S, 1
uH(du) ∈ DerA(log I). ♥ ♥ ét ♦♠♦♠♦r♣s♠
A♠♦s
H : ΩA(log I) → DerA(log I)é♥ ♣r
ΩA(log I) ∋ x =∑
ui∈S,ai∈A
aiduiui
+∑
vj∈A,i∈J,bj∈A,J♥
bjdvj
_
H∑
ui∈S,ai∈A
aiuiH(dui) +
∑vj∈A,i∈J,bj∈A,J♥
bjH(dvj)
.
♥ H|ΩA= H.
èrs P♦ss♦♥ ♦rt♠qs
♦r♦r −,− st ♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥
♣ ♦♥ ♥ é I ♥♥ré ♣r ♥ st ♥ éé♠♥ts A rt♠♥t
♣r♠èr ♦rs ♣♣t♦♥ ♠t♦♥♥♥ ss♦é H s ♣r♦♦♥ ♥ ♥ ♦♠♦♠♦r
♣s♠ A♠♦s
H : ΩA(log I) → DerA(log I).
é♥t♦♥ H st ♣♣é ♣♣t♦♥ ♠t♦♥♥♥ ♦rt♠q ss♦é à
strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ −,−.
♦r♦r t ♣r ♠♠ ♦♥ ét q t♦t strtr
P♦ss♦♥ ♦rt♠q ♣r♥♣ ♥t ♥ ♦♠♦♠♦r♣s♠ A♠♦s
Φ : ΩA(log I) → Hom(ΩA(log I),A)
α 7→ σ H(α)
♥ ♥ ét ♦♥ ♦r♠ s♥t sr ΩA(log I)
π(α, β) := [Φ(x)]y.
Pr♦♣♦st♦♥ π st ♥ ♦r♠ tr♥é sr ΩA(log I).
Pr ♦t x =p∑i=1xiduiui
+n∑
i=p+1xidai ∈ ΩA(log I).
♥
[Φ(x)](x) = [p∑1
xiui[σ H d](ui) +
n∑p+1
xi[σ H d](ai)](x)
=p∑1
xiui[σ H d](ui)[
p∑j=1
xjdujuj
+n∑
j=p+1xjdaj ]+
+n∑p+1
xi[σ H d](ai)[p∑j=1
xjdujuj
+n∑
i,j=p+1xid(aj)]
=p∑
i,j=1
xixjuiuj
σ[H d(ui)] d(uj)+
+n∑
i,j=p+1
xixjui
σ[H d(ui)] d(aj)+
+n∑
i,j=p+1
xixjuj
σ[H d(ai)] d(uj)+
+n∑
i,j=p+1xixj σ[H d(ai)] d(aj)
=p∑
i,j=1
xixjuiuj
ui;uj+n∑
1≤i≤p,p+1≤j≤n
xixjui
ui; aj
+n∑
1≤j≤p,p+1≤i≤n
xixjuj
ai;uj+n∑
i,j=p+1xixjai; aj = 0
t♥t ♦♥♥é q ΩA st ♥ s♦s ♠♦ ΩA(log I), ♠♦ s ♦r♠s
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
tr♥és sr ΩA(log I) st ♦♥t♥ ♥s ♠♦ s ♦r♠s tr♥és sr ΩA.
π ♣t ♦♥ ♦♣érr sr du⊗ dv ♣♦r t♦t u, v ∈ A.♥ ♦♥ π(du, dv) = [Φ(du)]dv = σ(H(du))dv = H(du)v = u, v. ♠♠ ss♦s ♦♥♥ qqs ♣r♦♣rétés π
♠♠ ♦t π ♦r♠ ss♦é à ♥ strtr P♦ss♦♥ ♦rt♠q
♣r♥♣ −,−. P♦r t♦t u, v ∈ S, a, b ∈ A ♦♥
π(adu
u, bdv
v) =
ab
uvu, v
π(adu, bdv
v) =
ab
vu, v
π(adu, bdv) = abu, v
Pr P♦r q st ♣r♠èr ♣r♦♣rété ♦♥sér♦♥s
u, v ∈ S t a, b ∈ A. ♣rès é♥t♦♥ π, ♦♥
π
(adu
u, bdv
v
)= Φ(a
du
u)bdv
v
=ab
uvσ(u,−)dv
=ab
uvu, v
Pr ♥ rs♦♥♥♠♥t ♥♦ ♦♥ é♠♦♥tr s ♣r♦♣rétés rst♥ts
qs ①♠♣s èrs P♦ss♦♥ ♦rt♠qs
♠♠ ♦t (A, −,−0) ♥ èr P♦ss♦♥ P♦r t♦t a0 ∈ A, a0 6=0A,
−,− := a0−,−0 st ♥ strtr P♦ss♦♥ ♥s A s t s♠♥t s ♣♦r
t♦t a, b, c ∈ A,
a, a00b, c0 + b, a00c, a0 + c, a00a, b0 = 0A
Pr t ♠♦♥trr q −,− = a0−,− ér ♥tté ♦ s t
s♠♥t s été st stst Pr rs −,− ér ♥tté
♦ s t s♠♥t s a, b, c+ b, c, a+ c, a, b = 0A. q éqt
à 0 = a, b, c+ b, c, a+ c, a, b
= a0a, a0b, c00 + a0b, a0c, a00 + a0c, a0a, b00= a0(a, a00b, c0 + b, a00c, a0 + c, a00a, b0)+
+a20(a, b, c00 + b, c, a00 + c, a, b00)= a0(a, a00b, c0 + b, a00c, a0 + c, a00a, b0)
réstt s ét ♥térté A.♥ ♣rtr été st t♦♦rs éré ♣♦r t♦t s♠r a0 ∈ A
−,−0.
èrs P♦ss♦♥ ♦rt♠qs
♦r♦r ♦t −,−0 ♥ strtr P♦ss♦♥ ♥s A.a0−,−0 st ♥ strtr P♦ss♦♥ ♦rt♠q ♦♥ é a0A ♣♦r
t♦t a0 ∈ A ér♥t
♥ é♠♥t ♦r♦r s♥t
♦r♦r ♦t A := k[x, y] ♦ A = k[x, y, z] t a0 ∈ A. P♦r t♦t str
tr P♦ss♦♥ −,−0 ♥s A, a0−,−0 st ♥ strtr P♦ss♦♥ ♥s A♦rt♠q ♣r♥♣ ♦♥ a0A.
Pr ❱♦r ♥♥①
①♠♣ r A := C[x, y, t, z] ♦♥ é♥t r♦t
f, g = xyz
(∂f
∂x
∂g
∂y− ∂f
∂y
∂g
∂x
)+∂f
∂t
∂g
∂z− ∂f
∂z
∂g
∂t
♦♥tr♦♥s q −,− é♥ ♣r st ♥ r♦t P♦ss♦♥ ♥s A.• rè ♥③ t ♥ts②♠étrq é♦♥t été s♥t
xyz
(∂f
∂x
∂g
∂y− ∂f
∂y
∂g
∂x
)+∂f
∂t
∂g
∂z−∂f∂z
∂g
∂t= xyz
df ∧ dg ∧ dt ∧ dzdx ∧ dy ∧ dt ∧ dz+
df ∧ dg ∧ dx ∧ dydx ∧ dy ∧ dt ∧ dz
• P♦r q st ♥tté ♦ st ♠♦♥trr ♣rès
❬♥r♦③ ❪ q
[π, π] = 0
♦ù [−,−] és♥ r♦t ♦t♥ t π = xyz∂
∂x∧ ∂
∂y+∂
∂t∧ ∂
∂zés♥
tr ss♦é à −,−.P♦r st érr q
[xyz∂
∂x∧ ∂
∂y, xyz
∂
∂x∧ ∂
∂y] = 0, [
∂
∂t∧ ∂
∂z,∂
∂t∧ ∂
∂z] = 0
t [xyz∂
∂x∧ ∂
∂y,∂
∂t∧ ∂
∂z] = 0.
Pr rs ért♦♥ Df := f,− = xyz(∂f
∂x
∂
∂y− ∂f
∂y
∂
∂x) +
∂f
∂t
∂
∂z− ∂f
∂z
∂
∂tér Dz(xyz) = xy /∈ (xyz)A. ♥st ♦♥ ♣s ♥ strtr P♦ss♦♥ ♦
rt♠q ♦♥ (xyz)A. ♣♥♥t st ♦rt♠q ♣r♥♣ ♦♥
(xy)A.
①♠♣ r A := C[x, y, z], ♦♥ s ♦♥♥ ① éé♠♥ts h, p ∈ A ♥♦♥
♦♥st♥ts r♦t
f, ghp := hdf ∧ dg ∧ dpdx ∧ dy ∧ dz +
df ∧ dg ∧ dhdx ∧ dy ∧ dz .
st ♥ér ♥ts②♠étrq t stst rè ♥③
P♦r ♠♦♥trr q r♦t st P♦ss♦♥ st ♦♥ érr ♥tté
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
♦ ♥♥t ♦♠♣t s ♣r♦♣rétés ért♦♥s r♥r st
♠♦♥trr q
z, x, yhphp + x, y, zhphp + y, z, xhphp = 0
P♦r ♦♥ r♠rqr q
x, yhp = h∂p
∂z+∂h
∂z
♥ ♣♦s♥t H = x, yhp, ♥ ♣♣t♦♥ s♠♣ s é♥t♦♥s ♦♥♥
z, x, yhphp = h
(∂H
∂x
∂p
∂y− ∂H
∂y
∂p
∂x
)+
(∂H
∂x
∂h
∂y− ∂H
∂y
∂h
∂x
)
♥ sstt ♥s tt été∂H
∂yt∂H
∂x♣r
∂H
∂x=∂h
∂x
∂p
∂z+ h
∂2p
∂xz+∂2h
∂xz.
∂H
∂y=∂h
∂y
∂p
∂z+ h
∂2p
∂yz+∂2h
∂yz.
t ♦♥ ♦t♥t
z, x, yhphp + x, y, zhphp + y, z, xhphp =
= h2∂p
∂y
∂2p
∂xz+ h
∂p
∂y
∂2h
∂xz− h2
∂p
∂x
∂2p
∂yz− h
∂p
∂x
∂2h
∂yz+∂h
∂y
∂2h
∂xz− h
∂h
∂x
∂p
∂yz− ∂h
∂x
∂h
∂yz+
h2∂p
∂z
∂2p
∂yx+ h
∂p
∂z
∂2h
∂yx− h2
∂p
∂y
∂2p
∂zx− h
∂p
∂y
∂2h
∂zx+∂h
∂z
∂2h
∂yx− h
∂h
∂y
∂p
∂zx− ∂h
∂y
∂h
∂zx+
h2∂p
∂x
∂2p
∂zy+ h
∂p
∂x
∂2h
∂zy− h2
∂p
∂z
∂2p
∂xy− h
∂p
∂z
∂2h
∂xy+∂h
∂x
∂2h
∂zy− h
∂h
∂z
∂p
∂xy− ∂h
∂z
∂2h
∂xy= 0.
♦♥ −,−hp st ♥ ♥ strtr P♦ss♦♥ sr A. ♣s ♣♦r t♦t f ∈ A,♦♥
f, hhp = hdf ∧ dh ∧ dpdx ∧ dy ∧ dz ∈ hA.
♥ ♦♥t ♦♥ q −,−hp st ♦rt♠q ♦♥ hA.
①♠♣ ♦♥t (Qi)1≤i≤n−2 (n − 2) éé♠♥ts C[x1, ..., xn]. P♦r t♦t
λ ∈ C[x1, ..., xn], r♦t
f, g = λdf ∧ dg ∧ dQ1 ∧ ... ∧ dQn−2
dx1 ∧ .... ∧ dxnst ♥ strtr P♦ss♦♥ ♥s
C[x1, ..., xn] ♦rt♠q ♦♥ λC[x1, ..., xn].
Pr♦♣♦st♦♥ ♦t strtr P♦ss♦♥ ♥s C[x, y] st s♦t s②♠♣tq
s♦t ♦rt♠q
Pr ♦t −,− ♥ strtr P♦ss♦♥ ♥s C[x, y].
P♦r t♦t f, g ∈ C[x, y], ♦♥
f, g = x, y(∂f∂x
∂g
∂y− ∂f
∂y
∂g
∂x)
Prt♥t −,− st s②♠♣tq s x, y ∈ C∗. ♥s s ♦♥trr st
♦rt♠q ♦♥ x, yC[x, y].
❱rétés P♦ss♦♥ ♦rt♠qs
❱rétés P♦ss♦♥ ♦rt♠qs
tt ♣rt st ♦♥sré à ♦♥strt♦♥ é♦♠étrq ♥♦t♦♥ strtr
P♦ss♦♥ ♦rt♠q
♥s tt ♣rt s ♠♥t♦♥ ①♣t♦♥♥ ♦♥ és♥r ♣r
• X ♥ rété ♦♠♣① ♠♥s♦♥ ♦♠♣① n,
• OX s s r♠s ♦♥t♦♥ ♦♦♠♦r♣s
• ΩX s s r♠s s ♦r♠s ♦♦♠♦r♣s sr X,
• MD s s r♠s s ♦r♠s ♠ér♦♠♦r♣s sr D.
sr r
♦t U ♥ ♦♠♥ Cn t D ⊂ U ♥ ②♣rsr U é♥ ♣r éq
t♦♥ h(z) = 0, ♦ù h st ♥ ♦♥t♦♥ ♦♦♠♦r♣ ♦rs ♣♦r t♦t q♦r♠ ω
♠ér♦♠♦r♣ ♥s U à ♣ôs ♥s D, ♦♥ té♦rè♠ s♥t
é♦rè♠ ❬t♦ ❪ s ♣r♦♣rétés s♥ts s♦♥t éq♥ts
hω t hdω s♦♥t ♦♦♠♦r♣s
hω t dh ∧ ω s♦♥t ♦♦♠♦r♣s
①st ♥ ♦♥t♦♥ ♦♦♠♦r♣ g t ♥ (q − 1)♦r♠ ξ t ♥ q♦r♠
♦♦♠♦r♣ η sr U t q
dimCD ∩ z ∈ U : g(z) = 0 ≤ n− 2
gω =dh
h∧ ξ + η
①st ♥ s♦s s♣ ♥②tq ♠♥s♦♥ (n − 2) A ⊂ D t q s
r♠s ω ♥ t♦t ♣♦♥t p ∈ D−A s♦♥t ♦♥t♥s ♥sdh
h∧Ωq−1
U,p +ΩqU,p.
té♦rè♠ st é♥t♦♥ s♥t
é♥t♦♥ ❯♥ q♦r♠ ♠ér♦♠♦r♣ sr U st ♦rt♠q ♦♥ D s
stst s ♦♥t♦♥s éq♥ts é♦rè♠
P♦r t♦t ♣♦♥t p X t t♦t ♥tr ♥tr q, ♦♥ ♥♦t
ΩqX,p(logD) := r♠ s q♦r♠s ♦rt♠qs ♥ ♣
ΩqX(logD) := ∪p∈X
ΩqX,p(logD)
Pr rs ♣r♦♣♦st♦♥ s♥t ♥♦s ♣r♠t é♥r ♥♦ é♦♠étrq
♥♦t♦♥ ért♦♥ ♦rt♠q ♥tr♦t à ♣rt
Pr♦♣♦st♦♥ ❬t♦ ❪ ♦t δ ♥ ♠♣s trs sr X s ♣r♦♣rétés
s♥ts s♦♥t éq♥ts
P♦r t♦t ♣♦♥t ss p D, tr t♥♥t δ(p) ♥ p st t♥♥t à D.
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
P♦r t♦t ♣♦♥t p D, s hp st ♦♥t♦♥ é♥t♦♥ D, ♦rs δhp st
♥s é (hp)OX,p.
é♥t♦♥ ❯♥ ♠♣s trs δ st t ♦rt♠q ♦♥ D ♦ ♦
rt♠q s ér s ♦♥t♦♥s éq♥ts Pr♦♣♦st♦♥
♥ ♣♦s
DerX,p(logD) ④δ r♠ s ♠♣s trs ♦♦♠♦r♣s sr X ♥ p t q
δhp ∈ hpOX,P ⑥
DerX(logD) = ∪p∈X
DerX,p(logD)
♠♠ ♥ s ♣r♦♣rétés s♥ts
DerX(logD) st ♥ OXs♦s ♠♦ ♦ér♥t DerX .
DerX(logD) st st ♣♦r r♦t [−,−] s ♠♣s trs
♦♦♠♦r♣s
Pr ♣r♠èr ♣r♦♣rété é♦ t q DerX(logD) st ♥♦②
♠♦r♣s♠ s① ♦ér♥ts s♥t
DerX → OX/hOX
δ 7→ δh.
①è♠ ♣r♦♣rété st rt
♠♠ s♥t étt ♥ ♥ ♥tr s s ♦r♠s ér♥ts ♦rt
♠qs t s ♠♣s trs ♦rt♠qs
♠♠ ❬t♦ ❪
éré ♥ ♦r♠ ♦rt♠q s♥t ♥ ♠♣ tr
♦rt♠q st ♥ ♦r♠ ♦rt♠q
♦♥trt♦♥ ♥ ♦r♠ ♦rt♠q ♣r ♥ ♠♣ trs ♦rt
♠q st ♥ ♦r♠ ♦rt♠q
♥ ♣rtr ♦♥trt♦♥ ♥t ♥ té ♥tr DerX,p(logD) t
Ω1X,p(logD) ♣♦r t♦t p ∈ D.
s♥st ss q ΩX,p(logD) t DerX,p(logD) s♦♥t s OX,p♠♦s ré①s
♥ é♥ér ΩX,p(logD) tDerX,p(logD) ♥ s♦♥t rs q sD ér s ②♣♦tèss
té♦rè♠ ♥s ❬t♦ ❪
é♥t♦♥ ❯♥ sr rét D X st t r ♦ t♦ s DerX,p(logD)
st r ♥ t♦t p ∈ D.
①♠♣ ♥ ♦♥sèr sr X = C3 sr D = h = 0 ♦ù h = xy(x+
y)(y+xz) s ♠♣s trs δ1 = x∂x+y∂y, δ2 = x2∂x−y2∂y−z(x+y)∂zt δ3 = (xz + y)∂z ér♥t δ1(h) = 4f, δ2(h) = (2x − 3y)h t δ3(h) = xh. Pr
rs δ1 ∧ δ2 ∧ δ3 = −xy(zx+ y)(y + x). ♥ ♦♥t q D st ♥ sr r
X.
❱rétés P♦ss♦♥ ♦rt♠qs
♣r♦♣♦st♦♥ s♥t ét ♥ ♥ ♥tr s ért♦♥s ♦rt♠qs ♣r♥
♣s t s ♠♣s trs ♦rt♠qs
Pr♦♣♦st♦♥ ♦t D ♥ sr X. ♦t ♠♣s tr ♦rt♠q
♦♥ D st ♥ ért♦♥ ♦rt♠q ♣r♥♣ OX .
Pr st r q t♦t ♠♣ trs sr X st ♥ ért♦♥ OX .
♦t δ ♥ ♠♣ trs ♦rt♠q ♦♥ D. ♥ s♣♣♦s q D :=
z;h(z) = 0 t q S = h1, ..., hp ♦ù h = h1.h2...hp ♣rès é♥t♦♥
δ(hi) ∈ hiOX . ♦♥ δ st ♦rt♠q ♣r♥♣ ♦♥ S. é♦rè♠ ♥♦s és♦♥s q t♦t ♦r♠ ♦rt♠q ω ♠t ♥
értr ♦r♠
gω =dh
h∧ ξ + η.
♥ ♥ ét é♥t♦♥ s♥t
é♥t♦♥ rés ♥ q♦r♠ ♦rt♠q ω st rstrt♦♥ ξ
gà D.
♥ ♥♦tr resω
é♦rè♠ s♥t rtérs s srs ♣♦r sqs ΩX(logD) st ♥♥ré
♣r s ♦r♠s r♠és
é♦rè♠ ❬t♦ ❪ ♦t (D, p) = (D1, p)∪ ...∪ (Dm, p) é♦♠♣♦st♦♥
♦ ♥ ♦♠♣♦s♥ts rréts ♥ sr D ♥ ♥ ♣♦♥t p ∈ D, t h = h1...hm s ♦♥t♦♥ é♥t♦♥
s ♦♥t♦♥s s♥ts s♦♥t éq♥ts
Ω1X,p(logD) =
m∑i=1
OX,pdhihi
+Ω1X,p
Ω1X,p(logD) st ♥♥ré ♣r s ♦r♠s r♠és
res(Ω1X,p(logD)) =
n⊕i=1
ODi,p
Di st ♥♦r♠ dimCSingDi ≤ n− 3 ♣♦r ♠
Di ⋔ Dj i 6= j; i, j = 1, ...m sr ♦♠♣é♠♥tr ♥ s♦s
♥s♠ ♠♥s♦♥ n− 3 D Di t Dj s♦♥t à r♦s♠♥ts ♥♦r♠①
♣♦r i 6= j, i, j = 1, ...,m
dimCDi ∩Dj ∩Dk ≤ n− 3 ♣♦r i 6= j 6= k 6= i i, j, k = 1, ...,m.
❯♥ r♠rq sr s ♦r♠s ér♥ts ♦rt♠qs t♠♣s trs ♦rt♠qs
♥s tt s♦s st♦♥ ♥♦s ♣♣♦rt♦♥s qqs ♣rés♦♥s sr ♥♦t♦♥
♦r♠s ér♥ts ♦rt♠qs
t♥t ♦♥♥é q ω =dy
xér
x2ω = xdy ∈ ΩX t dx2∧ω = 2xdx∧ dyx
= 2dx∧dy ∈ ΩX ♦♥ ♣t ♦♥r q
st ♦rt♠q ♦♥ sr D C2 é♥ ♣r ♦♥t♦♥ ♦♦♠♦r♣
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
h(x, y) = x2.
r éqt♦♥ gω = 2adx
x+bdx+cdy ♥ s ♦♥t♦♥s ♦♦♠♦r♣s g, a, b t c ♣♦r
s♦t♦♥
g = xc
2a+ xb = 0
♥t ♦♥ q ♠♥s♦♥ D ∩ (x, y) ∈ C2, g(x, y) = 0 st 1; ♣♦r t♦t
s♦t♦♥ (g, a, b, c) 6= (0, a, b, 0).
s♥st ♣rès ♣r♦♣rété é♦rè♠ q ♣♦r t♦ts ♦♥t♦♥s
♦♦♠♦r♣s g, a t t♦t ♦r♠ ♦♦♠♦r♣ η ts q gω = 2adx
x+ η, ♦♥
1 = dimC(D ∩ (x, y) ∈ C2, g(x, y) = 0) ≤ 2 − 2 = 0. q st sr ♦♥
ω =dy
x♥st ♣s ♥ ♦r♠ ♦rt♠q ♦♥ D ♦rsq ♦♥ s♣♣♦s q
D st é♥ ♣r ♦♥t♦♥ h = x2. ♦♥trt éq♥ s ♣r♦♣rétés
é♦rè♠ tt ♦♥trt♦♥ rést t q ♦♥t♦♥ é♥t♦♥
D ♥st ♣s rét s♥st q t ♦tr ♦♥t♦♥ rrétté D
♥s s ②♣♦tèss té♦rè♠ ❬t♦ ❪ ♥s t♦t q st ♥♦s
s♣♣♦sr♦♥s q ♦♥t♦♥ é♥t♦♥ D st à rré r éqt♦♥ ♦
hp = 0 ♥ t♦t ♣♦♥t p ∈ D.
é♥t♦♥ t ♣r♠èrs ♣r♦♣rétés
♦t X ♥ rété ♦♠♣① ♠♥s♦♥ ♥ n t D ♥ sr rét t r
X éqt♦♥ h = 0 ♦ù h st r♠ ♥ ♦♥t♦♥ ♦♦♠♦r♣ ♥ ♥♦t OX
s s r♠s ♦♥t♦♥s ♦♦♠♦r♣s sr X.
é♥t♦♥ ❯♥ strtr P♦ss♦♥ ♦♦♠♦r♣ sr X st ♦♥♥é ♥ r♦
t −,− q ss♥ à ♥ ♦♣ (f, g) r♠s ♦♥t♦♥s ♦♦♠♦r♣s ♥ ♥
♣♦♥t x X ♥ r♠ f, g ♦♥t♦♥ ♦♦♠♦r♣ ♥ x ér♥t s ♣r♦♣rétés
s♥ts
• −,− st ♥ér ♥ts②♠étrq
• f, g, h+ g, h, f+ h, f, g = 0 ♥tté ♦
• f, gh = f, gh+ f, hg rè ♥③
st ♣r♦é ♥s ❬P♦s ❪ q t♦t strtr P♦ss♦♥ ♦♦♠♦r♣
♥t ♥ ♦♠♦♠♦r♣s♠ OX ♥ér
H : ΩX → DerX
t q H(df)(g) = f, g H st ♣♣t♦♥ ♠t♦♥♥♥ ss♦é à −,− tt ♣♣t♦♥ ♦♥ ♠♦♥tr q t♦t strtr P♦ss♦♥ ♦♦♠♦r♣
♥t ♥ t♥sr ♦♦♠♦r♣
π ∈ H0(X,2∧TX)
♣♣é tr P♦ss♦♥
❱rétés P♦ss♦♥ ♦rt♠qs
é♥t♦♥ ❯♥ strtr P♦ss♦♥ ♦♦♠♦r♣ −,− sr X st t ♦
rt♠q ♦♥ D s ♣♦r t♦t r♠ f ♦♥t♦♥ ♦♦♠♦r♣ ♠♣
♠t♦♥♥ ss♦é H(df) st ♥ st♦♥ DerX(logD)
♥s st t♦t rété P♦ss♦♥ ♦♦♠♦r♣ ♦rt♠q ♦♥ ♥
sr D sr ♣♣é s♠♣♠♥t rété P♦ss♦♥ ♦rt♠q t ♦♥ ♥♦tr
(X, −,−, D).
é♦ tt é♥t♦♥ q ♣♦r t♦t ♦rt U X t t♦t st♦♥ f
OX sr U f,− st ♥ ért♦♥ ♦rt♠q ♣r♥♣ ♦♥ é
é♥t♦♥ D.
Psq D st r é♦rè♠ ♥s ❬t♦ ❪ ♥tr♥ q
n∧ Ω1
X(logD) = ΩnX(logD).
t
DeriX(logD) :=i∧Der1X(logD).
♥s s ♦♥
ΩqX(logD) =q∧Ω1
X(logD) ∼= HomOX(q∧Der1X(logD),OX)
é♥t♦♥ ♦t D ♥ sr r X.
s st♦♥s q∧Der1X(logD) s♦♥t ♣♣és q♠♣s trs ♦rt♠qs
♥ ♣♦s erX(logD) :=n⊕i=1DeriX(logD)
[−,−]s és♥ r♦t ♦t♥ ♦rs ♦♠♣t t♥ t qDerX(logD)
st st ♣♦r r♦t s ♠♣s trs erX(logD) rst st
♣♦r [−,−]s.
é♥t♦♥ ♥ ♣♣ r♦t ♦t♥ ♥s ♦rt♠q ♦♥ ♥
sr r D rstrt♦♥ [−,−]s à erX(logD).
s♥st q♥ tr ♦♦♠♦r♣ ♦rt♠q π st P♦ss♦♥ s t s♠♥t
s s♦♥t r♦t ♦t♥ ♦rt♠q st ♥
♦r♦r tr P♦ss♦♥ t♦t strtr P♦ss♦♥ ♦rt
♠q sr X st ♥ st♦♥ Der2X(logD)
Pr ♦t π tr ♥ strtr P♦ss♦♥ ♦rt♠q sr X, ♦rs
♣♦r t♦t a, b ∈ OX , ♦♥
π(da, db) := H(da)b
stàr idaπ ∈ Der1X(logD).
♥ ét ♣r♦♣rété ♥rs ♦♣ (ΩX , d) q DerX ∼=σHom(ΩX ,OX).
♦♠♣t t♥ t q ΩX ⊂ ΩX(logD) ♦rs Hom(ΩX(logD),OX) ⊂Hom(ΩX ,OX). Pr rs ♥s♦♥ Der1X(logD) ♥s DerX ♠♣q q
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
Hom(ΩX(logD),OX) ∼= Der1X(logD) ∼= σ(Der1X(logD)). ♥s H ♥t ♥
♦♠♦♠♦r♣s♠ ΩX rs Hom(ΩX(logD),OX); r♥r s ♣r♦♦♥ ♦♥
♠♥èr ♥♦♥q ♥ ♥ ♦♠♦♠♦r♣s♠ s① OX ♠♦s H
ΩX(logD) rs Hom(ΩX(logD),OX). ♦ù réstt
♦r♦r ♦t strtr P♦ss♦♥ ♦♦♠♦r♣ ♥♦♥ tr t ♥♦♥ s②♠
♣tq sr ♥ sr ss st ♦rt♠q
Pr
♦s s♦♥s q t♦t strtr P♦ss♦♥ ♦♦♠♦r♣ ♥♦♥ ♥ sr X st ♥t
♣r ♥ st♦♥ π ré ♥t♥♦♥q ω−1X X. Psq π st ♥♦♥ s②♠♣tq
①st ♥ ♦♥t♦♥ ♦♦♠♦r♣ h t qD := z ∈ X,h(z) = 0 t π = h∂x∧∂y. s♥st q π st ♦rt♠q ♦♥ D.
①♠♣ ♦t D = h = x4 + y5 + xy4 = 0 ♥ ♦r ♣tq
X = C2. s ♠♣s trs δ1 = (16x2 + 20xy)∂x + (12xy + 16y2)∂y t
δ2 = (16xy2 + 4y3 − 12xy)∂x + (12y3 − 4x2 + 5xy − 100y2)∂y s♦♥t ♦rt♠qs
♦♥ D s s♦♥t rs t ♦♥stt♥t ♦♥ ♥ s DerX(logD). q
♠♣q q D st r ♥ é♥t sr C2 r♦t P♦ss♦♥ s♥t
f, g = −(64x4 + 1356x2y2 + 64xy4 + 1808xy3 + 64y5)(∂xf∂yg − ∂yf∂xg).
r♦t st P♦ss♦♥ ♦rt♠q ♦♥ D.
♥ t
f, g =
= [(16x2 + 20xy)(12y3 − 4x2 + 5xy − 100y2)− (16xy2 + 4y3 − 12xy)(12xy + 16y2)]
(∂xf∂yg − ∂yf∂xg)
=
∣∣∣∣16x2 + 20xy 12xy + 16y2
16xy2 + 4y3 − 12xy 12y3 − 4x2 + 5xy − 100y2
∣∣∣∣ (∂xf∂yg − ∂yf∂xg)
= hk(∂xf∂yg − ∂yf∂xg)
♦ù
hk =
∣∣∣∣16x2 + 20xy 12xy + 16y2
16xy2 + 4y3 − 12xy 12y3 − 4x2 + 5xy − 100y2
∣∣∣∣ .
①st♥ k st ssré ♣r t q D st r
s♥st q ♣♦r t♦t ♦♥t♦♥ ♦♦♠♦r♣ f, f,− = kh(∂xf∂y − ∂yf∂x) r
kh(∂xf∂y − ∂yf∂x) ∈ DerX(logD). ♥ ♦♥t q tt strtr P♦ss♦♥ st
♦rt♠q ♦♥ D.
①♠♣ ♥ ♦♥sèr sr X = C3 r♦t f, g = (zx+y)(x(∂xf∂zg−∂zf∂xg)−y((∂yf∂zg−∂zf∂yg)). ♦♥tr♦♥s q st P♦ss♦♥ ♦rt♠q ♦♥
sr D = h = xy(x+ y)(y + xz) = 0 X = C3.
t♥sr ss♦é à r♦t st
π = x(zx+ y)∂x∧ ∂y+ y(xz+ y)∂y ∧ ∂z. P♦r ♠♦♥trr q −,− st P♦ss♦♥
st ♠♦♥trr q
πhi∂hπjk+πhj∂hπki+πhk∂hπij = 0 ♣♦r t♦s i, j, k = 1, 2, 3 ♦ù (πij) st ♠tr
π. ♥s s ♣rtr s étés s♦♥t éq♥ts à
❱rétés P♦ss♦♥ ♦rt♠qs
z, x∂zy, z+ z, y∂zz, x = 0. q st éré
♦s ♣♦♦♥s ss r♠rqr q D st r r s ♠♣s trs δ1 =
x∂x + y∂y δ2 = x2∂x − y2∂y − z(x + y)∂z t δ3 = (xz + y)∂z ♦r♠♥t ♥ s
DerX(logD) t q π = δ1 ∧ δ3. ♥ ♣t ♦♥ r r♦t ♦t♥
♦rt♠q π. r r♦t ♥♦s ♦♥♥ [δ1 ∧ δ3, δ1 ∧ δ3] = [δ1, δ1] ∧ δ3 ∧δ3 + δ ∧ [δ1, δ3] ∧ δ3 + δ ∧ [δ3, δ1] ∧ δ3 + δ1 ∧ δ1 ∧ [δ3, δ3] = 0. q ♠♦♥tr q
r♦t st P♦ss♦♥ rst à ♠♦♥trr q st ♦rt♠q ♦♥ D.
P♦r st r♠rqr q ♣♦r t♦t ♦♥t♦♥ ♦♦♠♦r♣ sr X, ♦♥
f,− = δ1(f)δ3 − δ3(f)δ1 q st ♦rt♠q ♦♥ D.
❱rétés ♦s②♠♣tqs
♥s tt ♣rt D és♥r ♥ sr r ♥ rété ♦♠♣① X
♠♥s♦♥ ♦♠♣① n t ω és♥r ♥ ♦r♠ ♦rt♠q ♦♥ D
r♠é ♥ ♦♥sèr ♠♦r♣s♠ s① I : DerX(logD) −→ ΩX(logD)
é♥ ♣r
I(v) = ivω.
P♦r t♦t v ∈ DerX(logD), ♦♥ ♥♦t Lvω éré ω s♥t v.
é♥t♦♥ ❯♥ st♦♥ v DerX(logD) st t ω♦s②♠♣tq s
♣résr ω Lvω = 0.
♥s♠ s ♠♣s ω♦s②♠♣tqs sr ♥♦té SympωX ♣r♦♣♦st♦♥ s
♥t ♦♥♥ ♥ rtérst♦♥ s r♠s ♠♣s ω♦s②♠♣tqs
Pr♦♣♦st♦♥ ❯♥ ♠♣ trs ♦rt♠q v st ω
♦s②♠♣tq s t s♠♥t s ivω st ♥ ♥ ♦r♠ ♦rt♠q r
♠é
♦t α r♠ ♦r♠ ♦rt♠q sr X. ①st v ∈ SympωX t
q α = I(v) ♦rs iwα = 0 ♣♦r t♦t w ∈ ker(I).
Pr t♥t ♦♥♥é q dω = 0 ♦rs
Lv(ω) = ivdω + divω = d(I(v))
è ♣r ♣r♠èr ♣r♦♣rété
P♦r q st ①è♠ ♣r♦♣rété ♦♥ ♣♦r t♦t w ∈ ker(I)
iwα = α(w)
= I(v)(w)
= ω(v, w)
= −ω(w, v)= −I(w)(v) = 0
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
é♥t♦♥ ❯♥ ♠♣ trs ♦rt♠q v st t ω♠t♦♥♥ s ①
st ♥ ♦♥t♦♥ ♦♦♠♦r♣ f sr X t q I(v) = df
❯♥ t ♦♥t♦♥ ♦rsq ①st st ♣♣é ω♠t♦♥♥♥ v.
♣r Pr♦♣♦st♦♥ ♥♦s és♦♥s q s ♠♣s ω♠t♦♥♥s
s♦♥t ωs②♠♣tqs
és♥♦♥s ♣rHωX ♥s♠ s ♠♣s ω♠t♦♥♥s t ♣rH1(X, logD) ♣r
♠r r♦♣ ♦♦♠♦♦q ♠ ♦rt♠q X. ♥ ♣r♦♣♦st♦♥
s♥t
Pr♦♣♦st♦♥ st 0 → HωX → SympωX → H1(X, logD) st
①t
♦rsq D st ♦♠♥t qs♦♠♦è♥ t (X−D) ♣r♦♠♣t tt st
♥t
0 → HωX → SympωX → H1(X −D,C)
Pr ♣r♠èr ♣r♦♣rété é♦ t q i[v,w]ω = d(iv(dg)) ♣♦r t♦t
v, w ∈ HωX ts q I(v) = df t I(w) = dg. ①è♠ ♣r♦♣rété q♥ à
é♦ é♦rè♠ r♦t♥ ♠ t é♦rè♠ ♦♠♣rs♦♥
♦rt♠q
①♠♣ P♦r D := (0, z2, z3) ∈ C3, ♦♥
v = v1z1∂z1 + v2∂z2 + v3∂z3 ∈ DerX(logD).
Pr rs ω =dz1z1
∧ dz2 +dz1z1
∧ dz3 ∈ ΩC3(logD) dω = 0 t I(v) = −(v2 +
v3)dz1z1
+ v1d(z2 + z3). ♥ ♣r♥♥t v1 = 0 t v2 + v3 = −1 v rst ♥ ♠♣
trs ♦rt♠q ♦♥ D t ♦♥ I(v) =dz1z1
= d log z1 Psq ♦♥t♦♥
(z1, z2, z3) 7→ log z1 ♥st ♣s ♦♦♠♦r♣ sr C3, ♦rs v = v2∂z2 − (1 + v2)∂z3 ♥st
♣s ♥ ♠♣ ω♠t♦♥♥
♥ ♣♦s K = ker(I).
ω st r♥ ♦♥st♥t t ♥♦♥ tr s ♦♥t♦♥s ω♠t♦♥♥♥s ①st♥t
♦♠♥t ♥ ♣t ♦♥ ♥tr♦r s s r♠s ♦♥t♦♥s ♦♠♥t
ω♠t♦♥♥♥s
és♥♦♥s ♣r OX/K s♣ s ♦♥t♦♥s ♦♠♥t ω♠t♦♥♥♥s
Pr♦♣♦st♦♥ OX/K st ♥ s èrs P♦ss♦♥
Pr ♦♥t f, g ∈ OX/K ; ①st v, w ∈ DerX(logD) ts q df = I(v) t
dg = I(w) r d(fg) = fdg + gdf = fI(w) + gI(v) = I(fw + gv). ♦♥ OX/K st
♥ s♦s èr OX . ♣rès é♥t♦♥ OX/K , ♣♣t♦♥ ϕ : v 7→ f ♦ù
df = I(v) st ♥ srt♦♥ OX/K sr HωX
❱rétés P♦ss♦♥ ♦rt♠qs
①st ♥ ♣♣t♦♥ ψ : OX/K → HωX t q ϕ ψ = idOX/K
♥ ♦♥sèr ♣♣t♦♥ ♥ér
−,−ω : OX/K ⊗OX/K → OX/K
(f, g) 7→ ψ(f)g
♣rès q ♣réè ♦♥
f, gω = ψ(f).g
= ω(w,ψ(f))
= −ω(ψ(f), w)= −iwiψ(f)ω = −iψ(g)df = −g, fω
P♦r q st ♥tté ♦ ♥♦s ♦♥s
(dω)(ψ(f), ψ(g), ψ(h)) = ψ(f)ω(ψ(g), ψ(h)) − ψ(g)ω(ψ(f), ψ(h)) +
ψ(h)ω(ψ(f), ψ(g)) − ω([ψ(f), ψ(g)], ψ(h)) + ω([ψ(f), ψ(h)], ψ(g)) −ω([ψ(g), ψ(h)], ψ(f))
r−ω([ψ(f), ψ(g)], ψ(h)) + ω([ψ(f), ψ(h)], ψ(g))− ω([ψ(g), ψ(h)], ψ(f))
= i[ψ(f),ψ(g)]ωψ(h) + i[ψ(f),ψ(h)]ωψ(g)− i[ψ(g),ψ(h)]ωψ(f)
= −d(iψ(f)dg)ψ(h) + d(iψ(f)dh)ψ(g)− d(iψ(g)dh)ψ(f)
= −d(ψ(f)dg)ψ(h) + d(iψ(f)dh)ψ(g)− d(iψ(g)dh)ψ(f)
= −d(ω(ψ(g), ψ(f)))ψ(h) + d(ω(ψ(h), ψ(f)))ψ(g)− d(ω(ψ(h), ψ(g)))ψ(f)
= −ψ(h)ω(ψ(g), ψ(f)) + ψ(g)ω(ψ(h), ψ(f))− ψ(f)ω(ψ(h), ψ(g))
= ψ(f)ω(ψ(g), ψ(h))− ψ(g)ω(ψ(f), ψ(h)) + ψ(h)ω(ψ(f), ψ(g)) .♦♥
(dω)(ψ(f), ψ(g), ψ(h)) = 2(ψ(f)ω(ψ(g), ψ(h)) − ψ(g)ω(ψ(f), ψ(h)) +
ψ(h)ω(ψ(f), ψ(g))).
♥ ♥ ét qf, gω, hω+ = −h, ψ(f)g+ = −ψ(h)(ψ(f)g)+
= −ψ(h)(ψ(f)g)− ψ(f)(ψ(g)h)− ψ(g)(ψ(h)f)
= −ψ(h)ω(ψ(g), ψ(f))− ψ(f)ω(ψ(h), ψ(g))− ψ(g)ω(ψ(f), ψ(h))
= ψ(f)ω(ψ(g), ψ(h))− ψ(g)ω(ψ(f), ψ(h)) + ψ(h)ω(ψ(f), ψ(g))
=1
2(dω)(ψ(f), ψ(g), ψ(h))
= 0r ω st r♠é
♥ ♥ ét ♦r♦r s♥t
♦r♦r (X, −,−ω, D) st ♥ rété P♦ss♦♥ ♦rt♠q
és♥♦♥s ♣r Kω s♦s s èrs K ♦r♠é s ♠♣s ♦①
♦rs ♦♥ st ①t ♦rt s① èrs s♥t
0 → Kω → HωX →
OX/K
C→ 0
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
é♥t♦♥ ♥ ♣♣ rété ♦s②♠♣tq t♦t tr♣t (X,ω,D) ♦r♠é ♥
rété ♦♠♣① ♠♥s♦♥ ♦♠♣① 2n ♥ sr rét D X t ♥
♦r♠ ♦rt♠q r♠é ω ér♥t
ωn 6= 0 ♥s H0(X,Ω2n[D])
♦rsq (X,ω,D) st ♥ rété ♦s②♠♣tq st ♥t
0 → CX → OX → HωX → 0
Pr rs t♦t st♦♥ s : HωX → OX ①t♥s♦♥ ♥t ♥ ♦r♠
C : ∧2HωX → C
é♥ ♣r
C(v, w) = [s(v), s(w)]− s([v, w])
q st ♥ ♦② ②♥r ♦s ♦♥s ♠♦♥trr q st ♥s
ss ♦♦♠♦♦ ω.
Pr♦♣♦st♦♥ C t ω ♦♥t ♠ê♠ ss ♦♦♠♦♦
Pr ♣♣♦♥s q st qst♦♥ tr♦r ♥ ♥ ♥tr ♦r♠ C sr HωX
♥t ♣r t♦t st♦♥ ♥ér s ①t♥s♦♥ èr HωX s ♠♣s
trs ♦♠♥t ♦♠t♦♥♥s t ♦r♠ ♦s②♠♣tq ω sr rété
♦s②♠♣tq X.
Ps ♣résé♠♥t ①t♥s♦♥ st ♦♥♥é ♣r
0 → CXi→ OX
χ→ HωX → 0
♦ù iχfω = df ♣♦r t♦t f ∈ OX .
♣♣♦♥s ss q strtr P♦ss♦♥ ♥t ♣r ω st é♥ ♣r
f, g = −ω(χf , χg).
♣♣t♦♥
θ : HωX → End(OX)
X 7→ θ(X) : f 7→ s(X), f
♥t sr OX ♥ strtr HωX ♠♦
♥ t ♣♦r t♦t X,Y ∈ HωX , ♦♥
θ([X,Y ])f
= s(X), s(Y ), fJacobi= s(X), s(Y ), f − s(Y ), s(X), f= [θ(X), θ(Y )]f.
❱rétés P♦ss♦♥ ♦rt♠qs
♣rés♥t ♣♦s♦♥s Lalt∗(HωX ,OX) ♥s♠ s ♣♣t♦♥s ♠t♥érs
tr♥és sr HωX rs ♥s OX .
Lalt∗(HωX ,OX) ♠♥ ér♥t ②♥r δ é♥ ♣r
δf(X1, ..., Xp) =∑
(−1)i+1θ(Xi)f(X1, ..., Xi, ..., Xp)+∑(−1)i+jf([Xi, Xj ], X1, ..., Xi, ..., Xj , ..., Xp)
st ♥ ♦♠♣① ♥s ♦♥t s r♦♣s ♦♦♠♦♦s ss♦és s♦♥t ♥♦tés
H∗(HωX ,OX).
P♦r p = 1, 2, été ♦♥♥
δf1(X1, X2) = θ(X1)f1(X2)− θ(X2)f
1(X1)− f1([X1, X2])
♣♦r t♦t f1 ∈ Lalt1(HωX ,OX) t
δf2(X1, X2, X3) =
= θ(X1)f2(X2, X3)− θ(X2)f
2(X1, X3) + θ(X3)f2(X1, X2)−
f2([X1, X2], X3) + f2([X1, X3], X2)− f2([X2, X3], X1)
♣♦r t♦t f2 ∈ Lalt2(HωX ,OX).
s st♦♥s ♥érs ①t♥s♦♥ ét♥t s ♣♣t♦♥s C♥érs HωX
rs OX , s s♦♥t ♦♥ s ♦♥s ♦t s ♥ st♦♥ ♣rès
♦♥
δs(X1, X2) = θ(X1)s(X2)− θ(X2)s(X1)− s([X1, X2])
= fX1 , s(X2) − fX2 , s(X1)s([X1, X2])
= −ω(χ(fX1), χ(s(X2))) + ω(χ(fX2), χ(s(X1)))− s([X1, X2])
.
♥s
δs(X1, X2) + ω(X1, X2) = −ω(X1, X2)− s([X1, X2]).
r
C(X1, X2) = s(X1), s(X2) − s([X1, X2]) = −ω(X1, X2)− s([X1, X2])
s étés t ♦♥ ét q
C = ω + δs.
Pr rs ♥ r♠♣ç♥t f2 ♥s ♣r ω t ♥ ♣♣q♥t t q χ st
♥ ♠♦r♣s♠ èrs ♦♥ ♦t♥t
δω = 0.
♦ù réstt
♦t ω =dh
h∧ ψ + η ♥ ♦r♠ ♦s②♠♣tq sr X.
♥ ♣♦s
SD = δ ∈ DerX(logD), ψ.δ = 0.♥
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
♠♠ P♦r t♦t rété ♦s②♠♣tq (X,D, ω), SD st ♥ s♦s
èr DerX(logD)
Pr ♦t ω =dh
h∧ψ+η ♥ ♦r♠ ♦s②♠♣tq sr X. ♥ 0 = dω = dψ.
r
0 = dψ(x, y) = X.ψ(ω)(Y )−X.ψ(Y )− ψ([X,Y ]).
♦ù réstt
és♥♦♥s ♣r Dsing ♣rt s♥èr D t ♣r Dred s ♣rt ss
♥
♦r♦r SD st ♥ strt♦♥ ♥tér X à s ♠♥s♦♥
♥ sr Dred.
qs ①♠♣s rétés P♦ss♦♥ ♦rt♠qs
♥ s♣♣♦s q X st ♥ rété ♦♠♣① D ♥ sr rét t r
X. ♦s tt ②♣♦tès ΩX(logD) rs♣ DerX(logD) ♣t êtr ♦♠♠
s s st♦♥s ♥ ré t♦r T ∗(logD) rs♣ T (logD) T ∗(logD) rs♣
T (logD) st ♣♣é ré ♦t♥♥t t♥♥t ♦rt♠q X. ♥ s ♦♥♥
θ ∈ H0(X,∧2 T (logD)).
Pr é♥t♦♥ θ st ♥ ♣♣t♦♥ OX ♥ér ♥ts②♠étrq sr T ∗(logD).
♦s s♦♥s q ♣♦r t♦t A♠♦M s ♦♥trsM⊗− t (−)M s♦♥t ♦♥ts
♥ tr ♣♦r t♦t R♥♥ A ♥ ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥
HomOX(T ∗(logD))⊗ T ∗(logD)),OX) ≃ HomOX
(T ∗(logD)), T (logD))
Pr ♦♥sérr s♦♠♦r♣s♠ ♦♥t♦♥ ♦♥t♦r t tsr té ♥
tr T ∗(logD) t T (logD)
Pr♦♣♦st♦♥ ♥t q s ♦♥♥r ♥ tr ♦rt♠q π st
éq♥t à s ♦♥♥r ♥ ♥q ♠♦r♣s♠ π : T ∗X(logD) → TX(logD) r♥♥t
♦♠♠tt r♠♠ s♥t
OT ∗X(logD)X ⊗ T ∗
X(logD)ev
T∗X (logD)
OX // OX
T ∗X(logD)⊗ T ∗
X(logD)
π×idT∗X
(logD)
OO
π
77n
nn
nn
nn
nn
nn
nn
nn
nn
nn
nn
nn
nn
nn
n
♥ t♥♥t ♦♠♣t é♥t♦♥ evT ∗X(logD)
OX(π) ♦♠♠ttté
r♠♠ ♠♦♥tr q π st é♥ ♣r éqt♦♥ s♥t
〈π(α), β〉 = 〈π, α ∧ β〉
❱rétés P♦ss♦♥ ♦rt♠qs
P♦r t♦t α, β ∈ T ∗X(logD).
Pr♦♣♦st♦♥ ♦t X ♥ rété ♦♠♣① t D ♥ sr rét t r
X ré ♦t♥♥t ♦rt♠q T ∗X(logD) st ♦s②♠♣tq sr π∗(D) st
♦♥ ♥ rété P♦ss♦♥ ♦rt♠q
Pr ♥ t s F : (X1, D1) → (X2, D2) st ♥ ♠♦r♣s♠ rétés ♦♠
♣①s t q F ∗(D2) = D1 ♦rs r♠♠ ♣r♦t ré s♥t ♥t ♥
♦♠♦♠♦r♣s♠
ϕF : X1 ×X2 T∗X logD2 → T ∗
X logD1
T ∗ logD1
X1 ×X2 T∗ logD2
ϕF=F ∗p244
p2 //
p1
T ∗ logD2
π2
F ∗
OO
X1 F// X2
.
♥ ♣♦s♥t ♥s r♠♠ X1 = T ∗(logD) t X2 = X ♦♥ ♦t♥t ♣r s
♣♣t♦♥ ♦♥ ∆ : T ∗(logD) → T ∗(logD) ×X T ∗(logD) r♠♠
♦♥♥♥t à ♥ ♠♦r♣s♠ s① θ = ϕπ ∆
T ∗X(logD)
θ //
∆
T ∗T ∗X(logD)(log π
∗(D))
T ∗X(logD)×X T ∗
X(logD)
ϕπ=π∗p233
p2 //
p
T ∗X(logD)
π
π∗T∗
X(logD)
OO
T ∗X(logD) π
// X
.
♣r ♦♥strt♦♥ θ ∈ H0(T ∗X(logD),Ω1
T ∗X(logD)(log(π
∗(D))) ♥ ♣♦s ω = dθ
Pr ♦♥strt♦♥ ω st ♥ ♦r♠ ♦s②♠♣tq
♦r♦r ❬t♦ ❪ ♦t D ♥ sr à r♦s♠♥ts ♥♦r♠① X.
♦♣ (T ∗X(logD), π∗(D)) st ♥ rété ♦s②♠♣tq
Pr ♦t (U0, x0) ♥ rt ♦ ♦rt♠q X ♥ x0. ①st ♥ t
♥ s ♠ ♦♥t♦♥s ξi; i = 1, ..., n ♦♦♠♦r♣s é♥s sr π∗(U0) ts
q
θ|π∗(U0) =
p∑
i=1
ξidxixi
+
n∑
i=p+1
ξidxi
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
①♠♣ ❬♦t♦ ❪ X st ♥ sr ♦♠♣① ♠♥ ♥
sr rét D t s [D] st ss ♥t♥♦♥q K∗X , ♦rs ♦♣ (X,D)
st ♥ rété ♦s②♠♣tq t ♣s ♦r♠ ♦s②♠♣tq ss♦é st
ω ∈ K([D]) ⋍ OX .
é♥t♦♥ ♥ ♣♣ ♦r♠ ♦♠ ♦rt♠q ♦♥ ♥ sr rét
t r D ♥ rété ♦♠♣① X ♠♥s♦♥ n t♦t st♦♥ s♥s ③ér♦s
ΩnX(logD)
♣rès é♦rè♠ ♥s ❬t♦ ❪ s ♦r♠s ♦♠s ♦rt♠qs s♦♥t
♦r♠
µ =1
hdz1 ∧ dz2 ∧ ... ∧ dzn
Pr♦♣♦st♦♥ ♦t D = h = 0 ♥ sr r ♥ rété ♦♠♣①
X ♠♥s♦♥ α ♥ ♦r♠ ♦♦♠♦r♣ r♠é X t µ ♥ ♦r♠ ♦♠
♦rt♠q X. ♦rs t♦t tr π X t q
iπµ = α
st P♦ss♦♥ ♦rt♠q ♦♥ D.
Pr ♦t a ♥ ♦♥t♦♥ ♦♦♠♦r♣ ♥ s♥♥♥t ♣s sr X. ♥ ♣♦s
µ =a
hdx ∧ dy ∧ dz, α = αxdx+ αydy + αzdz
Pr ♥ rt ♦♥ ♦t♥t
π =h
a(αz∂x ∧ ∂y + αy∂z ∧ ∂x + αx∂y ∧ ∂z)
P♦r ♠♦♥trr q π st P♦ss♦♥ st érr ♥tté ♦ q ♥s
s s rés♠ à
π12(∂yπ23 − ∂xπ31) + π13(∂zπ23 − ∂yπ12) + π23(∂zπ31 − ∂xπ12) = 0
♦ù π12 = ha−1αz, π13 = −ha−1αy t π23 = ha−1αx.
r
π12(∂yπ23 − ∂xπ31) = h2a−1αz(αx∂ya−1 − αy∂xa
−1) + ha−2αz(αx∂yh − αy∂xh) +
a−2h2αz(∂yαx − ∂xαy)
π13(∂z(π31)−∂x(π12)) = h2a−1αy(αz∂xa−1−αx∂za−1)+ha−2αy(αz∂xh−αx∂zh)+
h2a−2αy(∂xαz − ∂zαx)
π23(∂z(π31)−∂y(π12)) = h2a−1αx(αy∂za−1−αz∂ya−1)+ha−2αx(αy∂zh−αz∂yh)+
a−2h2αx(∂zαy − ∂yαz)
t dα = 0 s t s♠♥t s
∂yαx − ∂xαy = ∂xαz − ∂zαx = ∂zαy − ∂yαz = 0
s♣ s SU(2) ♠♦♥♦♣ôs ♠♥étqs r
q ♠♦♥tr q π st ♥ t♥sr P♦ss♦♥ Pr rs ♣♦r t♦t st♦♥ f
OX ♦♥
f,− = a−1h[(∂xfαz − ∂zfαx)∂y + (∂zfαy − ∂yfαz)∂x + (∂yfαx − ∂xfαy)∂z]
st ♥ ért♦♥ ♦rt♠q ♦♥ hOX .
s♣ s SU(2) ♠♦♥♦♣ôs ♠♥étqs r
♣rès ♦♥s♦♥ ♥s ❬♦♥s♦♥ ❪ s♣ ♠♦ ér M2 s
♠♦♥♦♣ôs ♠♥étqs r st ♥ t♦♥ rété ♦♠♣① R2
s ♦♥t♦♥s rt♦♥♥s w(z) =f(z)
g(z) ré ts q w(∞) = 0.
♥ ét♥t ②♥♠q s ♠♦♥♦♣ôs ♦♥ ♣r♦ ♥s
❬t② t♥ ❪ q s β1 t β2 s♦♥t s r♥s g, ♦rs
ω =1
f(β1)f(β2)(f(β2)df(β1) ∧ dβ1 + f(β1)df(β2) ∧ dβ2)
st ♥ strtr s②♠♣tq sr M2.
♦s ♦♥s ♠♦♥trr q ω st ♥ ♦r♠ ♦s②♠♣tq ♦♥ D =
R(f, g) = 0 ♦ù R(f, g) és♥ rést♥t f t g. Pr st ♥♦s ♦♥strs♦♥s
strtr P♦ss♦♥ ♥t ♣r ω t ♥♦s ♠♦♥tr♦♥s q st ♦rt♠q
♦♥ D.
♣rès ❬♦♥s♦♥ ❪ s éé♠♥ts R2 s♦♥t s♦s ♦r♠
f(z)
g(z)=
a0 + a1z
b0 + b1z + z2
r w(∞) = 0. ♥s s
w(z) =f(z)
g(z)=
a0 + a1z
b0 + b1z + z2
t ♦♥
g= b21 − 4b0, β1 = −1
2
(b1 +
√g
), β2 =
1
2
(−b1 +
√g
).
♥ ♥ ét q
dβ1 =1√g
(β1db1 + db0) , dβ2 = − 1√g
(β2db1 + db0)
df(β1) ∧ dβ1 =1√g
(β1da0 ∧ db1 + da0 ∧ db0 + β21da1 ∧ db1 + β1da1 ∧ db0
)
df(β2) ∧ dβ2 = − 1√g
(β2da0 ∧ db1 + da0 ∧ db0 + β22da1 ∧ db1 + β2da1 ∧ db0
).
♣tr r s strtrs P♦ss♦♥ ♦rt♠qs
♥ ♣♦s
ω =df(β1)
f(β1)∧ dβ1 +
df(β2)
f(β2)∧ dβ2.
Psq f t g ♥♦♥t ♣s r♥s ♦♠♠♥s ω st ♥ é♥ sr C4. ♥s
s ①♣rss♦♥ ♥t
√gf(β1)f(β2)ω
= (β1f(β2)− β2f(β1)) da0 ∧ db1 + (f(β2)− f(β1)) da0 ∧ dbo+
(β21f(β2)− β22f(β1)
)da1 ∧ db1 + (β1f(β2)− β2f(β1)) da1 ∧ db0.
r
f(β1)f(β2) = (a0 + a1β1)(a0 + a1β2) = a20 + a1a0(β1 + β2) + a21β1β2= a20 − a1a0b1 + a21b0.
β1f(β2)− β2f(β1) = −a0√g
β21f(β2)− β22f(β1) = (a0b1 − a1b0)√g
f(β2)− f(β1) = a1√g.
Pr rs ∣∣∣∣∣∣
a0 a1 0
0 a0 a1b0 b1 1
∣∣∣∣∣∣= a20 − a1a0b1 + a21b0.
s♥st q R(f, g) = f(β1)f(β2). ♥s st ♥♦s ♥♦tr♦♥s R.
♥ sstt♥t s ①♣rss♦♥s ♥s ♦♥ ♦t♥t
ω =1
R(−a0da0 ∧ db1 + a1da0 ∧ db0 + (a0b1 − a1b0)da1 ∧ db1 − a0da1 ∧ db0) .
♥ ♥ ét q
R2ω ∧ ω= (−a0da0 ∧ db1 + a1da0 ∧ db0 + (a0b1 − a1b0)da1 ∧ db1 − a0da1 ∧ db0)∧ (−a0da0 ∧ db1 + a1da0 ∧ db0 + (a0b1 − a1b0)da1 ∧ db1 − a0da1 ∧ db0)= 2
(a20da0 ∧ db1 ∧ da1 ∧ db0 + a1(a0b1 − a1b0)da0 ∧ db0 ∧ da1 ∧ db1
)
= 2(a20 − a1(a0b1 − a1b0)
)da0 ∧ da1 ∧ db0 ∧ db1
= 2Rda0 ∧ da1 ∧ db0 ∧ db1.
♦ù
ω ∧ ω =2
Rda0 ∧ da1 ∧ db0 ∧ db1 6= 0.
♥ ♦♥t q ω st ♥ ♦r♠ ♦s②♠♣tq ♦♥ D := R = 0. r♦t P♦ss♦♥ ss♦é à ω st
u, vω = f(β1)
(∂u
∂β1
∂v
∂f(β1)− ∂u
∂f(β1)
∂v
∂β1
)+f(β2)
(∂u
∂β2
∂v
∂f(β2)− ∂u
∂f(β2)
∂v
∂β2
).
s♣ s SU(2) ♠♦♥♦♣ôs ♠♥étqs r
s♥st q ♠♣ ♠t♦♥♥ ss♦é à u st
Xu = f(β1)
(∂u
∂β1
∂
∂f(β1)− ∂u
∂f(β1)
∂
∂β1
)+ f(β2)
(∂u
∂β2
∂
∂f(β2)− ∂u
∂f(β2)
∂
∂β2
).
♥ ♣♣q♥t ♠♣ sr R = f(β1)f(β2), ♦♥ ♦t♥t
Xu(R) = R
(∂u
∂β1+
∂u
∂β2
).
♦♠♠ Xu(R) st ♥ éé♠♥t é ♥♥ré ♣r R, ♦♥ ♦♥t q −,−ωst ♥ strtr P♦ss♦♥ ♦rt♠q ♦♥ D.
tr sr D = R(f, g) = 0.♣rès q ♣réè srD ♣♦r éqt♦♥ x2−xyt+y2z. ♥ r♠rq
q
x2 − xyt+ y2z = (x− yt
2)2 + y2(z − t2
4)
= X2 + Y 2Z
♦ù X = x− yt
2, Y = y t Z = z− t2
4. Pr rs X
∂h
∂X+Y
∂h
∂Y= 2h. ♥ ♥ ét
s②stè♠ ♠♥♠ é♥értrs s♥t Der(logD).
δ1 = X∂
∂X+ Y
∂
∂Y
δ2 = Y∂
∂Y+ 2Z
∂
∂Z
δ3 = Y 2 ∂
∂X+ 2X
∂
∂Z
δ4 = Y Z∂
∂X−X
∂
∂Y
Psq Der(logD) st ♥ s♦s ♠♦ Der q st r♥ ♥ ♣t êtr
r r r♥ ♥s♠ ♠♥♠ ss é♥értrs st s♣érr à
♠rq té♦r strtr P♦ss♦♥ ♦rt♠q ♦♥strt t♦t
♦♥ ♣tr été t ♣♦r s srs rs ①♠♣ s♣
s ♠♦♥♦♣ôs r ♥♦s ♠♦♥tr q ♣t ss s é♥r ♣♦r rt♥s
srs ♥♦♥ rs
♣tr
♦♦♠♦♦ P♦ss♦♥
♦rt♠q
♦♠♠r ♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥ ♦
rt♠q
èrs ♥rt ♦rt♠qs
trtr èr ♥rt sr ΩA(log I) ♥t ♣r♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I.
♦♥strt♦♥ é♦♠étrq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
qs strtrs èr ss♦és ① strtrs
P♦ss♦♥ ♦rt♠qs
trtrs èr ♥rt sr ΩX(logD)
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠qs s str
trs ♦s②♠♣tqs
♦♦♠♦♦ P♦ss♦♥ t P♦ss♦♥ ♦
rt♠q strtr P♦ss♦♥ x, y = 0, x, z =
0, y, z = xyz sr A = C[x, y, z]
♥tr♦t♦♥
♦s ♠♦♥trr♦♥s ♥s tt ♣rt q t♦t strtr P♦ss♦♥ ♦rt
♠q ♣r♥♣ ♥t sr ♠♦ s ér♥ts ♦r♠s ♦rt♠qs
♥ strtr èr ♥rt tt strtr é♦ ♥ r♣rés♥
tt♦♥ ♠♦ s ér♥ts ♦r♠s ♦rt♠qs ♣r s ért♦♥s
♦rt♠qs tt r♣rés♥tt♦♥ ♥t ♦♠♣① P♦ss♦♥ ♦rt♠q
♦s ♦♥s qqs r♦♣s ♦♦♠♦♦ ♦♠♣① ♦s ♠♦♥tr♦♥s q
s r♦♣s ♦♦♠♦♦ P♦ss♦♥ t P♦ss♦♥ ♦rt♠qs s strtrs
P♦ss♦♥ ♦s②♠♣tq s♦♥t s♦♠♦r♣s
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦♥strt♦♥ érq ♦♦♠♦♦ P♦s
s♦♥ ♦rt♠q
♥s tt ♣rt A és♥r ♥ èr sr ♥ ♥♥ ♦♠♠tt ♥tr
R rtérstq ③ér♦ t I ♥ é ♣r♦♣r A.
èrs ♥rt ♦rt♠qs
♦s ♣♣r♦♥s ♥♥ t♦t ♥♥ éq♣é ♥ r♦t
♦t L ♥ ♥♥ q st ♥ ♣s ♥ A♠♦ ♥ é♥t♦♥ s♥t
é♥t♦♥ ❬♥rt ❪ ♥ ♣♣ strtr èr ♥rt
♥s L t♦t ♦♠♦♠♦r♣s♠ A♠♦s t èrs ρ : L → DerAs♦♠s à ♦♥t♦♥ ♦♠♣tté s♥t
[α, aµ] = ρ(α)(a)µ+ a[α, µ]
♥s st ♥♦s ♣♣r♦♥s èr ♥rt t♦t tr♣t (L, [−,−], ρ)
♦r♠é ♥ ♥♥ (L, [−,−]) q ♥ ♣s st ♥ A♠♦ t ♥ strtr
èr ♥rt ρ sr L.
Pr s♦ rté t♦t èr ♥rt (L, [−,−], ρ) sr r♣rés♥té ♣r
L. P♦r t♦s µ ∈ L t a ∈ A, ρ(µ)(a) sr ♥♦té s♠♣♠♥t µ(a).
♦♥t P,Q ① A♠♦s ①st ① ç♦♥s ♠ttr ♥ strtr
A♠♦ sr r♦♣ t HomR(A,B) à s♦r
r : A×HomR(P,Q) → HomR(P,Q), ra()(p) := r(a,)(p) := (a+)(p) = (ap)
t
l : A×HomR(P,Q) → HomR(P,Q), la()(p) := (a,)(p) := (a)(p) = a(p)
P♦r t♦t a ∈ A t ∈ HomR(P,Q), ♦♥ ♣♦s
δa := ra()− la().
Pr ♦♥strt♦♥ δa st ♥ ♥♦♠♦r♣s♠ R♥ér HomR(P,Q). ♦♥ ♣♦r
t♦t a, b ∈ A ♦♠♣♦sé δa δb st ♥ é♥
st rss ♥s ❬rss ❪ t ❱♥♦r♦ ♥s
❬❱♥♦r♦ ❪ ♦♥ ♦♣t é♥t♦♥ s♥t
é♥t♦♥ : P → Q st ♣♣é ♦♣értr ér♥t sr A ♦rr ♥érr
♦ é à s s st t t s ♣♦r t♦s a0, ..., as ∈ A ♦♥
δa0 δa1 ... δas() = 0
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
♥ r♠rq q ♥s♠ s ♦♣értrs ér♥ts sr A ♦rr ≦ s ♦r♠ ♥
r♦♣ t s t♦♥s é♥s ♣r s rt♦♥s t ♦♥ ♥ t
① ♠♦s sr A à s♦r
s(P,Q) ♣♦r t♦♥ r t +s (P,Q) ♣♦r l. ♥ ♥♦t (+)s (P,Q) ♠♦
♦t♥ ♥ ♦♥♥t s ① t♦♥s
Pr s♦ s♠♣té +1 (P ) és♥r +1 (P, P ) ♣♦r t♦t A♠♦ P.
♥ s strt♦♥ ♣♦r t♦t ∈ s(P,Q), ♦♥
• P♦r s = 0 :
0 = δa()(p) = (ap)− a(p)
♣♦r t♦s a ∈ A t p ∈ P. ♦♥ s ♦♣értrs ér♥ts ♦rr ③ér♦ s♦♥t
①t♠♥t s ♣♣t♦♥s ♥érs P rs Q.
• P♦r s = 1 :
0 = (δab())(p) = δa((bp)− b(p)) = (abp)− b(ap)−a(bp)+ab(p).
tr♠♥t t s éé♠♥ts 1(P,Q) ér♥t rt♦♥
(abp)− b(ap)− a(bp) + ab(p) = 0.
♥s s ♦♣értrs ér♥ts ♦rr ≦ 1 A rs Q s♦♥t rtérsés
♣r rt♦♥
(ab)− b(a)− a(b) + ab(1) = 0
♣♦r t♦t a, b ∈ A. st ♣r♥r p = 1 ♥s ♣♣♦♥s ss
q♥ ért♦♥ A à rs ♥s Q st ♥ éé♠♥t HomR(A, Q)
ér♥t
(ab) = a(b) + b(a)
♣♦r t♦t a, b ∈ A. ♥ ♥♦t Der(A, Q) ♥s♠ s ts ért♦♥s P♦r
t♦t ∈ Der(A, Q), ♦♥
(δab())(1) = (ab)−b(a)−a(b)+ab(1) = (ab)−b(a)−a(b) = 0
♣♦r t♦t a, b ∈ A. ♦♥ Der(A, Q) st ♥ s♦s ♠♦ strt 1(A, Q).
été ♥trs s ① ♠♦s ②♥t ♦rsq (1) = 0 ♣♦r t♦t
∈ 1(A, Q).
♦t P ♥ Aèr t L ♥ P ♠♦ éq♣é ♥ strtr é♥
♣r ♥ r♦t [−,−].
é♥t♦♥ ♥ ♣♣ strtr P èr ♥rt sr L t♦t ♦♠♦
♠♦r♣s♠ A♠♦s ρ : L → 1(P, P ) stss♥t ♣r♦♣rété ♦♠♣t
té s♥t
[α, pµ] = ρ(α)(p)µ+ p[α, µ]
♣♦r t♦t α, µ ∈ L t p ∈ P.
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦♠♠ ♥s s s èrs ♥rt ♥ P èr ♥rt
st ♥ qr♣t (L, [−,−], ρ, P ) ♦ù ρ st ♥ strtr P èr
♥rt sr L. ♦rsq♥ ♦♥s♦♥ ♥st ♣♦ss t♦t P èr
♥rt (L, [−,−], ρ) sr ♥♦té s♠♣♠♥t L.
♥ ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ♦t èr ♥rt sr A st ♥ Aèr
♥rt
Pr é♦ t q DerA st ♥ s♦s ♠♦ 1(A,A).
♦s ♥ és♦♥s q s èrs ♥rt s♦♥t ♥ s ♣rtr P
èrs ♥rt Pr rs t♦t strtr P èr ♥rt
sr L ♥t s r♣rés♥tt♦♥ ♣r s ♦♣értrs ér♥ts ♦rr sr A. ♥
♣t ♦♥ é♥r ♥ ♦♦♠♦♦ ss♦é à tt r♥èr
♦t L ♥ P èr ♥rt t q ♥ ♥tr ♥tr
é♥t♦♥ ♥ ♣♣ P ♦♥ ♠♥s♦♥ q ♦ q−P ♦♥ ss♦é à
ρ t♦t ♣♣t♦♥ q♥ér tr♥é L rs P.
♥ ♥♦tr Ltq(L,P ) s♣ s q − P ♦♥s Pr é♥t♦♥ ♦♥
Lt0(L,P ) = P.
♥ é♥t ♥ ♣♣t♦♥ ♥ér dρ : Ltq(L,P ) → Ltq+1(L,P ) ♣r ♦r♠
(dρf)(x1, ..., xq+1)
=q+1∑i=1
(−1)i+1ρ(xi)f(x1, ..., xi, ..., xq+1)
+q+1∑i<j
(−1)i+j+1f([xi, xj ], x1, ..., xi, ..., , xj , ..., xq+1)
Pr♦♣♦st♦♥ ♣♣t♦♥ dρ ér
dρ dρ = 0
Pr ♦s ♣r♦♣♦s♦♥s ♥ é ♣r ♦s réér♦♥s tr à ♥♥①
♣♦r ♥ ♣r ♦♠♣èt t été
• P♦r q = 1, ♦♥ ♣♦s = dρf ♣♦r t♦t f ∈ P. ♦rs ♣♦r t♦t x ∈ L ♦♥
(x) = ρ(x)f.
Pr rs
(dρg)(x1, x2) = ρ(x1)g(x2)− ρ(x2)g(x1)− g([x1, x2]).
♥ r♠♣ç♥t g ♣r , ♦♥ ♦t♥t
dρ dρ(f)(x1, x2) = ρ(x1)(x2)− ρ(x2)(x1)−([x1, x2])
= ρ(x1)ρ(x2)f − ρ(x2)ρ(x1)f − ρ([x1, x2])f
= ([ρ(x1), ρ(x2)]− ρ([x1, x2])) f
= 0
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
• P♦r q = 3, ♦♥ ♣♦s
g(x1, x2) = (dρf)(x1, x2) = ρ(x1)f(x2)− ρ(x2)f(x1)− f([x1, x2]).
P♦r t♦t f ∈ Lt1(L,P ).Pr rs ♣♦r t♦s x1, x2, x3 ∈ L, ♦♥
(dρg)(x1, x2, x3) = ρ(x1)g(x2, x3)− ρ(x2)g(x1, x3) + ρ(x3)g(x1, x2)
−g([x1, x2], x3) + g([x1, x3], x2)− g([x2, x3], x1).
♥ r♠♣ç♥t g ♣r s♦♥ ①♣rss♦♥ ♦♥ ♦t♥t
(dρg)(x1, x2, x3)
= ρ(x1) (ρ(x2)f(x3)− ρ(x3)f(x2)− f([x2, x3]))
−ρ(x2) (ρ(x1)f(x3)− ρ(x3)f(x1)− f([x1, x3]))
+ρ(x3) (ρ(x1)f(x2)− ρ(x2)f(x1)− f([x1, x2]))
−ρ([x1, x2])f(x3) + ρ(x3)f([x1, x2]) + f([[x1, x2], x3])
+ρ([x1, x3])f(x2)− ρ(x2)f([x1, x3])− f([[x1, x3], x2])
−ρ([x2, x3])f(x1) + ρ(x1)f([x2, x3]) + f([[x2;x3], x1])
♥ t♦rs♥t s trs f(x3), f(x2) t f(x1) rs♣t♠♥t ♦♥ ♦t♥t
(dρg)(x1, x2, x3)
= (ρ(x1)ρ(x2)− ρ(x2)ρ(x1)− ρ([x1, x2])) f(x3)
+ (−ρ(x1)ρ(x3) + ρ(x3)ρ(x1) + ρ([x1, x3])) f(x2)
+ (ρ(x2)ρ(x3)− ρ(x3)ρ(x2)− ρ([x2, x3])) f(x1)
+f ([[x1, x2], x3]− [[x1, x3], x2] + [[x2;x3], x1])
+ρ(x1)(f([x2, x3])− f([x2, x3])) + ρ(x2)(f([x1, x3])
−f([x1, x3])) + ρ(x3)(f([x1, x2])− f([x1, x2]))
été ré é♦ ♥tté ♦ r♦t [−,−] t t
q ρ ♦♠♠t s r♦ts
é♥t♦♥ ♦♦♠♦♦ ♦♠♣①
... // Lt∗+1(L,P ) // Lt∗(L,P ) // ...
st ♣♣é ♦♦♠♦♦ ♥rt L à rs ♥s P.
♥ s sss s ♣s ♠♣♦rt♥t èrs ♥rt (L, ρ) st
♣♦r q ρ : L → DerA st ♥ ♠♦♥♦♠♦r♣s♠ èrs ♦♥
r♠rqr q♥ é♥ér ♥ s♦s ♥s♠ L DerA ♠♥ ♥s♦♥ st ♥
èr ♥rt s t s♠♥t s st ♥ s♦s ♠♦ DerA.
♥s DerA(log I) t DerA s♦♥t s èrs ♥rt ♦♦♠♦♦
♥rt DerA(log I) rs♣ DerA st ♦♦♠♦♦ ♠
♦rt♠q A.
♥s st I és♥ ♥ é A ♥♥ré ♣r S = u1, ..., up ⊂ A.♦t (L, ρ) ♥ èr ♥rt sr A. ♥ ♠♠ s♥t
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♠♠ ρ(L)∩DerA(log I) st ♥ s♦s èr ♥♦♥ tr DerA.
Pr ρ ét♥t ♥ ♦♠♦♠♦r♣s♠ èrs ρ(L)∩DerA(log I) st r♠é
♣♦r r♦t DerA. Pr rs ♣♦r t♦t l ∈ L, u ∈ S uρ(l) = ρ(ul) ∈ρ(L) ∩DerA(log I).
é♥t♦♥ ❯♥ èr ♥rt ♦rt♠q ♦♥ I st ♥ tr♣t
(L, [−,−], ρ, I) ♦r♠é ♥ A♠♦ L éq♣é ♥ r♦t [−,−] t ♥
♦♠♦♠♦r♣s♠ èr ρ : L→ DerA(log I) stss♥t
♦t (L, [−,−], ρ, I) ♥ èr ♥rt ♦rt♠q ♦♥ I P♦rt♦t x, y, z ∈ L, a ∈ A, ♦♥
(ρ[x, y]− [ρ(x), ρ(y)])(a).z
= ρ[x, y](a).z − [ρ(x), ρ(y)](a).z
= ρ[x, y](a).z − ρ(x)[ρ(y)(a)].z + ρ(y)[ρ(x)(a)].z
= [[x, y], az]− a[[x, y], z]− [x, ρ(y)(a).z] + ρ(y)(a)[x, z] + [y, ρ(x)(a)z]− ρ(x)(a)[y, z]
= [[x, y], az]− a[[x, y], z]− [x, [y, az]] + [x, a[y, z]]+
+[y, a[x, z]]− a[y, [x, z]] + [y, [x, az]]− [y, a[x, z]]− [x, a[y, z]] + a[x, [y, z]]
= − ([az, [x, y]] + [x, [y, az]] + [y, [x, az]])− a ([[x, y], z] + [[y, z], x] + [[z, x], y])
= 0.
♥s (ρ[x, y] − [ρ(x), ρ(y)])(a) = 0 ♣♦r t♦t a ∈ A s A st s♥s t♦rs♦♥ ♦♥
ρ[x, y] = [ρ(x), ρ(y)]. st ♣r ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ♦t L ♥ A♠♦ s♥s t♦rs♦♥ Ann(L) = 0
❯♥ ♦♠♦♠♦r♣s♠ ρ : L → DerA(log I) A♠♦s st ♥ strtr èr
♥rt ♦rt♠q s t s♠♥t s stst
♦t P ♥ A♠♦ ♥ ♣♦s DerA(log I, P ) = δ ∈ DerA(A, P )t q δ(u) ∈uP ; ♣♦r t♦tu ∈ S. ♥ é♥t♦♥ s♥t
é♥t♦♥ DerA(log I, P ) st ♣♣é ♠♦ s ért♦♥s A ♦rt
♠qs ♣r♥♣s ♦♥ I à rs ♥s P.
s♥st q DerA(log I) = DerA(log I,A).
♦t ∈ +1 (P ); ♣♦r t♦t a, b ∈ A, p ∈ P, ♦♥
(r(a+ b)− l(a+ b))p = (ap)− a(p) +(bp)− b(p)
s♥ st q ♥t ♥ ♠♦r♣s♠ r♦♣s σ : A → HomR(P,Q) a 7→δa = r(a)− l(a).
Pr♦♣♦st♦♥ P♦r t♦t ∈ +1 (P ) t t♦t A♠♦ Q,
σ ∈ Der(A,HomR(P,Q)).
Pr Psq ∈ +1 (P ), ♣♦r t♦s a, b ∈ A, p ∈ P ♦♥
(abp) = b(ap) + a(bp)− ab(p).
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
♦♥
(abp)− ab(p) = (bσ(a) + aσ(b))(p).
stàr
σ(ab) = aσ(b) + bσ(a)
♦ù réstt
♥s♦♥ s ért♦♥s ♦rt♠qs ♦♥ I ♥s DerA ♣r♠t ♥
sr s ♦♣értrs ér♥ts ts q σ ∈ DerA(log I).P♦s♦♥s
+1 (log I) = ∈ +1 (P )|σ ∈ DerA(log I).
+1 (log I) st ♥♦♥ tr r ♣♦r t♦t ∈ +1 (P ), u ∈ S, ♦♥ u ∈+1 (log I). Pr rs +1 (log I) ♣♦ssè ♣r♦♣rété s♥t
Pr♦♣♦st♦♥ +1 (log I) st ♥ èr ♥rt ♦rt♠q
♦♥ I.
Pr ♣rès q ♣réè ①st ♥ ♣♣t♦♥
σ : +1 (log I) → DerA(log I) 7→ σ
P♦r t♦t f ∈ A, s ∈ P ♦♥ σf = fσ t
σ[ϕ1,ϕ2](f)s = [ϕ1, ϕ2](fs)− f [ϕ1, ϕ2](s)
= ϕ1ϕ2(fs)− ϕ2ϕ1(fs)− fϕ1ϕ2(s) + ϕ2ϕ2(s)
= ϕ1(σϕ2(f)s+ fϕ2(s))− ϕ2(σϕ1(f)s+ fϕ1(s))− f [ϕ1, ϕ2]s
= ϕ1(σϕ2(f)s) + ϕ1(fϕ2(s))− ϕ2(σϕ1(f)s)− ϕ2(fϕ1(s))− f [ϕ1, ϕ2]s
= σϕ1(σϕ2(f))s+ σϕ2(f)ϕ1(s) + σϕ1(f)ϕ2(s) + fϕ1(ϕ2(s))−σϕ2(σϕ1(f))s− σϕ1(f)ϕ2(s)− σϕ2(f)ϕ1(s)− fϕ2(ϕ1(s))− f [ϕ1, ϕ2]s
= [σϕ1 , σϕ2 ](f)s
tr ♣rt ϕ1, ϕ2 ∈ +1 (log I), f ∈ A t s ∈ P ♥♦s ♦♥s
[ϕ1, fϕ2] = ϕ1(fϕ2(s))− (fϕ2)(ϕ1(s))
= fϕ1(ϕ2(s)) + σϕ1(f)(ϕ2(s))− fϕ2(ϕ1(s))
= σϕ1(f)(ϕ2(s)) + f [ϕ1, ϕ2]
♥ ♣♦s
+1 (log I, P ) := ∈ +1 (A, P );σ ∈ DerA(log I, P ). ♦rs +1 (log I, P )st rtérsé ♣r
é♦rè♠ P♦r t♦t ∈ HomR(A, P ) s ♣r♦♣rétés s♥ts s♦♥t éq
♥ts
∈ +1 (log I, P )
σ ∈ Der(log I,HomR(A, P ))
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
Pr ♦♥t a, b ∈ A t ∈ HomR(A, P ).
σ(u) ∈ uHomR(A, P )t
σ(ab) = aσ(b) + bσ(a)
♦rs ♣♦r t♦t p ∈ P,
(abp) = a(bp) + b(ap)− ab(p)
Pr rs
δa,b(p) = (abp)− a(bp)− b(ap) + ab(p)
q ♠♣q ♣rès éqt♦♥ q δa,b = 0. ♦♥ st ♥ ♦♣értr
ér♥t ♦rr ≤ 1.
ré♣r♦q é♦ é♥t♦♥ +1 (log I, P ).
♥ ♥♦t
DI(B ⊂ P ) := ∈ DerA(log I, P )|(A) ⊂ BPr é♥t♦♥ DI(B ⊂ P ) = DerA(log I, B) s B st ♥ s♦s ♠♦ P.
♥ é♥t ♣r ♥t♦♥ ♥ st DIi (P ) ⊂ +
1 (log I, P ), i ≧ 0 A♠♦s
♥ ♣♦s♥t DI0 (P ) = P,DI
1 (P ) = DerA(log I, P ) t DIi+1(P ) = DI(DI
i (P ) ⊂((+
1 )i(log I, P ))) ♦ù (+
1 )i(P ) = +
1 (...(+1 (log I, P )...).
é♥t♦♥ s éé♠♥ts DIi (P ) s♦♥t ♣♣és ♣♦②ért♦♥s A ♥s P
♦rt♠qs ♦♥ I. ♣r♦♣♦st♦♥ s♥t ♦♥♥ ♥ sr♣t♦♥ été DI
i (P )
Pr♦♣♦st♦♥ P♦r t♦t i ≧ 1 ♥ éé♠♥t ∈ HomK(A, DIi−1) ♣♣rt♥t à
DIi s t s♠♥t s ♣♦r t♦t a, b ∈ A, stst s ♣r♦♣rétés s♥ts
(ab) = a(b) + b(a)
(a, b) +(b, a) = 0
Pr st ♥tq à ♣r♦♣♦sé ♥s ❬rss ❪
rss♦rt ♠♠ q DIi (A) t Hom(
i∧Ω(log I,A)) s♦♥t s♦♠♦r♣s
trtr èr ♥rt sr ΩA(log I) ♥t ♣r♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I.
♥s tt ♣rt ♥♦s ♦♣t♦♥s s ♥♦tt♦♥s st♦♥ ♥ s♣♣♦sr
♥ ♦tr q A st éq♣é ♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣
♦♥ ♥ é I ♥♥ré ♣r S t ♥♦s és♥r♦♥s ♦r♠ ss♦é ♣r ω.
ér♥t d sr s♠♣♠♥t ♥♦té d t ♦♠♣① ss♦é
0d // A d // 1∧
ΩA(log I)d // ... d // i∧
ΩA(log I)d // i∧
ΩA(log I)d // ...
sr ♣♣é ♦♠♣① ♠ ♦rt♠q A.
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
trtr ♥t sr ΩA(log I)
♣r♦♣♦st♦♥ s♥t ♦♠♣èt s ♣r♦♣rétés éré s ér
t♦♥s ♦rt♠qs
Pr♦♣♦st♦♥ ♦t δ ∈ DerR(log I). P♦r t♦tx
u∈ S−1ΩR(A), ♦♥
Lδ(x
u) =
1
uLδ(x)−
δ(u)
u
x
u
Pr ♥ t ♣♦r t♦t x ∈ ΩA, u ∈ I∗,Lδ(x) = Lδ(ux
u) = uLδ(
x
u) + δ(u)
x
u.
♦♥ Lδ(x
u) =
1
uLδ(x)−
δ(u)
u
x
u.
râ à tt ♣r♦♣♦st♦♥ ♥♦s ♦♥s s ♣r♦♣rétés s♥ts
♦r♦r P♦r t♦t u ∈ S t δ ∈ DerK(log I) ♦♥
Lδ(du
u) = d(
δ(u)
u)
Pr ♦tdu
u∈ ΩA(log I). ♦s és♦♥s Pr♦♣♦st♦♥ q
Lδ(d(u)
u) =
1
uLδ(d(u))−
δ(u)
u
d(u)
u
=1
ud(δ(u))− δ(u)
u
d(u)
u
Psq δ ∈ DerA(log I), ①st ♦♥ c ∈ A∗ t q δ(u) =
uc. s♥st qdδ(u)
u= d(c) +
d(u)
u= d(
δ(u)
u) +
δ(u)
u
d(u)
ut ♦♥
Lδ(d(u)
u) = d(
δ(u)
u) +
δ(u)
u
d(u)
u− δ(u)
u
d(u)
u= d(
δ(u)
u)
♦r♦r P♦r t♦t strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥
I sr A ♣♣t♦♥ ♠t♦♥♥♥ ♦rt♠q ss♦é H ♦♥
LH(d(u)
u)
(d(v)
v) = d
(1
uvu, v
)
♣♦r t♦t u, v ∈ S.
Pr ♦♥t u, v ∈ S. ♣rès é♥t♦♥ H, ♦♥
H(d(u)
u) =
1
uH d(u) = 1
uu,− =: ϕ
♥ ♣♣q♥t ♣r♦♣♦st♦♥ ♦♥ ♦t♥t
LH(d(u)
u)
(d(v)
v
)= Lϕ
d(v)
v
= d
(ϕ(v)
v
)
= d
(1
uvu, v
)
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♣r♦♣♦st♦♥ s♥t ♦♥♥ s ①♣rss♦♥s éré s ér♥ts
♦r♠s ♦rt♠qs ♦r♠ qdu
u ♦♥ s ért♦♥s ♦rt♠qs
♣r♥♣s
Pr♦♣♦st♦♥ ♦t H ♣♣t♦♥ ♠t♦♥♥♥ ♦rt♠q ss♦é à
♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I ♦r♠ ss♦é
ω. P♦r t♦t a ∈ A t u, v ∈ S, ♦♥
LH(a
d(u)
u)
(d(v)
v) = ad(
1
uvu, v) + 1
uvu, vd(a)
LH(a
d(u)
u)
(bd(v)
v) =
1
uu, bd(v)
v+
b
uvu, vd(a) + bad(
1
uvu, v)
LH(b
d(v)
v)
(ad(u)
u) =
b
vv, ad(u)
u+
a
uvv, ud(b) + abd(
1
uvv, u)
d
(ω(a
d(u)
u, bd(v)
v)
)= abd
(1
uvu, v
)+
b
uvu, vd(a) + a
uvu, vd(b)
Pr tt ♣r é♦ ♦r♦r ♦s r♥♦②♦♥s à ♥♥①
tt ♣r♦♣♦st♦♥ ♦♥ ét s réstts
♦r♦r ♦♥t a, b ∈ A t u, v ∈ S. ♥
−dω(aduu, bdv
v) + L
H(adu
u)
(bdv
v)− L
H(bdu
u)
(adv
v) =
=a
uu, bd(v)
v+b
va, vdu
u+ abd(
1
uvu, v
Pr ♦s és♦♥s ♣r♦♣♦st♦♥ t ♦r♦r q
−dω(aduu, bdv
v) + L
H(adu
u)
(bdv
v)− L
H(bdu
u)
(adv
v) =
= −abd[ 1uv
u, v]− b
uvu, vda− a
uvu, vdb+ a
uu, bdv
v+
b
uvu, vda+
+abd(1
uvu, v) + b
va, vdu
u+
a
uvu, vdb+ abd(
1
uvu, v).
♣rès s♠♣t♦♥ ♦♥ ♦t♥t
−dω(aduu, bdv
v) + L
H(adu
u)
(bdv
v)− L
H[bdu
u]
(adv
v)
=a
uu, bdv
v+b
va, vdu
u+ abd(
1
uvu, v
♦r♦r s♥t ♥♦s ♣r♠t rtr♦r ①♣rss♦♥ é♥ér r♦t
P♦ss♦♥ ♥t sr ΩA.
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
♦r♦r ♦♥t a, b ∈ A t u, v ∈ S. ♥
−dω(adu, bdv)+LH(ad(u))(bdv)−LH(bdu)(adv) = au, bdv+ba, vdu+abd(u, v)
Pr tt été rést s ♣r♦♣rétés s♥ts
d[ω(adu, bdv)] = au, vdb+ bu, vda+ abd[u, v]. LH(adu)(bd(v)) = abd[u, v] + au, bdv + bu, vda LH(bdv)(ad(u)) = abd[v, u] + bv, adu+ av, udb
♥ ♥ ét é♠♥t q
♦r♦r ♦♥t a, b ∈ A t u, v ∈ S. ♥
−dω(aduu, bdv) + L
H(adu
u)
(bdv) − LH(bdu)(adv
v) =
a
uu, bd(v) + ba, vdu
u+
abd(1
uu, v
Pr
P♦r t♦t a, b ∈ A t u, v ∈ S ♦♥
d(ω(adu
u, bdv)) = d(
ab
uu, v)
= [1
uu, v]d(ab) + abd(
1
uu, v)
=a
uu, vdb+ b
uu, vd(a) + abd(
1
uu, v)
LH[a
du
u]
(bdv) = aLH[d(u)
u]
(bdv) + σ(H[du
u])(bdv)d(a)
= a(bLH(du
u)
(d(v)) + H(du
u)(b)dv) +
b
uu, vd(a)
= abd(1
uu, v) + a
uu, bd(v) + b
uu, vd(a)
LH[(bdv)](adu
u) = bLH(dv)(a
du
u) + σ(H(d)(v))(a
du
u)d(b)
= b(aLH(dv)(du
u) + H(dv)(a)
du
u) +
a
uv, ud(b)
= bad(1
uv, u) + bv, adu
u+a
uv, ud(b)
s♥st q
−dω(aduu, bd(v)) + L
H(adu
u)
(bdv)− LH(bdu)(adv
v)
=a
uu, bdv + ba, vd(u)
u+ abd
(1
uu, v
)
♦t S ♥ ♣rt ♠t♣t ♥ èr P♦ss♦♥ S. ♠♠ ss♦s
♠♦♥tr q ♦sé S−1A ért ♥♦♥q♠♥t ♥ strtr P♦ss♦♥ ♥t
♣r A
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♠♠ ♦t A ♥ èr P♦ss♦♥ P♦r t♦t ♣rt ♠t♣t
S ⊂ A, ♦sé S−1A ♣♦ssè ♥ strtr ♥♦♥q èr P♦ss♦♥
Pr és♥♦♥s ♣r −,− strtr P♦ss♦♥ sr A. ♦rs r♦t
a1s−11 , a2s
−12 = a1, a2(s1s2)−1 − a1, s2a2(s1s22)−1−
s1, a2a1(s21s2)−1 + a1a2s1, s2(s21s22)−1
st s♦♥ ♥q ♣r♦♦♥♠♥t sr S−1A.P♦s♦♥s
[α, β]ω = −dω(α, β) + LH(α)β − LH(β)α
♦rs [−,−]ω st R ♥ér ♥ts②♠étrq
s réstts ss♦s ①♣t♥t [−,−]ω sr s é♥értrs ΩA(log I).
♠♠ ♦t a, b ∈ A t u, v ∈ S
[adu
u, bdv
v
]
ω
=a
uu, bdv
v+b
va, vdu
u+ abd(
1
uvu, v)
[adu
u, bdv
]
ω
=a
uu, bdv + ba, vdu
u+ abd(
1
uu, v)
[adu, bdv]ω = au, bdv + ba, vdu+ abd(u, v)
[adu, b
dv
v
]
ω
= au, bduu
+b
va, vdu+ abd(
1
vu, v)
Pr s ♣r♦♣rétés s♦♥t ♥ ♦♥séq♥ rt Pr♦♣♦st♦♥ t
ss ♦r♦rs
P♦r q st ♣r♦♣rété ♦♥ ♣♦r t♦t a, b ∈ A t u, v ∈ S, ♦♥
d(ω(adu
u, bdv
v)) = abd(
1
uvu, v) + a
uvu, vdb+ b
uvu, vda
LH(a
du
u)
(bdv
v) =
a
uu, bdv
v+
b
uvu, vda+ abd(
1
uvu, v)
LH(b
dv
v)
(adu
u) =
b
vv, adu
u+
a
uvv, udb+ abd(
1
uvv, u)
t ♦♥
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
−d(ω(aduu, bdv
v)) + L
H(adu
u)
(bdv
v)− L
H(bdv
v)
(adu
u)
= −abd( 1
uvu, v)− a
uvu, vdb− b
uvu, vda+ b
vv, adu
u
+a
uu, bdv
v+
b
uvu, vda+ abd(
1
uvu, v)− b
vv, adu
u
+ − a
uvv, udb− abd(
1
uvv, u)
=b
vv, adu
u+a
uu, bdv
v+ abd(
1
uvu, v)
+ [−abd( 1
uvu, v) + abd(
1
uvu, v)] + [− a
uvu, vdb− a
uvv, udb]
+[b
uvu, vda− b
uvu, vda]
=b
vv, adu
u+a
uu, bdv
v+ abd(
1
uvu, v)
♦ù [adu
u, bdv
v
]
ω
=a
uu, bdv
v+b
va, vdu
u+ abd(
1
uvu, v)
♠♥èr ♥♦ ♦♥ ♠♦♥tr s ♣r♦♣rétés t
♥ ♣rtr ♣♦r a = b = 1 ♦♥
♦r♦r P♦r t♦t u, v ∈ S, ♦♥
[du
u,dv
v
]
ω
= d(1
uvu, v)
[du,
dv
v
]
ω
= d(1
vu, v)
[du
u, dv
]
ω
= d(1
uu, v) [du, dv] = d(u, v).
Pr♦♣♦st♦♥ P♦r t♦t u, v, w ∈ S ♦♥ [[du
u,dv
v
]
ω
,dw
w
]
ω
+
[[dv
v,dw
w
]
ω
,du
u
]
ω
+
[[dw
w,du
u
]
ω
,dv
v
]
ω
= 0
Pr ❱♦r ♥♥①
♥s ♠ê♠ ♦t ♥♦s ♦♥s
Pr♦♣♦st♦♥ P♦r t♦t u, v ∈ S t w ∈ A ♦♥
[[du
u,dv
v
]
ω
, dw
]
ω
+
[[dv
v, dw
]
ω
,du
u
]
ω
+
[[dw,
du
u
]
ω
,dv
v
]
ω
= 0
[[du
u, dv
]
ω
, dw
]
ω
+
[[dv, dw]ω ,
du
u
]
ω
+
[[dw,
du
u
]
ω
, dv
]
ω
= 0
Pr ❱♦r ♥♥① ♣♦r ♣s ét
♦s ♦♥s à ♣rés♥t ♠♦♥trr q ♣♦r t♦s ω1 = a1du1u1
+ b1dv1, ω2 = a2du2u2
+
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
b2dv2 t ω3 = a3du3u3
+ b3dv3 ♥s ΩA(log I) ♦♥
0 =
[[ω1, ω2]ω , ω3]ω + [[ω2, ω3]ω , ω1]ω + [[ω3, ω1]ω , ω2]ω
=
[[a1du1u1
, a2du2u2
]
ω
, a3du3u3
]
ω
+
[[a1du1u1
, a2du2u2
]
ω
, b3dv3
]
ω
+
[[a1du1u1
, b2dv2
]
ω
, a3du3u3
]
ω
+
[[a1du1u1
, b2dv2
]
ω
, b3dv3
]
ω
+
[[b1dv1, a2
du2u2
]
ω
, a3du3u3
]+
[[b1dv1, a2
du2u2
]
ω
, b3dv3
]
ω
+
[[b1dv1, b2dv2]ω , a3
du3u3
]+ [[b1dv1, b2dv2]ω , b3dv3]ω
+
[[a2du2u2
, a3du3u3
]
ω
, a1du1u1
]
ω
+
[[a2du2u2
, a3du3u3
]
ω
, b1dv1
]
ω
+
[[a2du2u2
, b3dv3
]
ω
, a1du1u1
]
ω
+
[[a2du2u2
, b3dv3
]
ω
, b1dv1
]
ω
+
[[b2dv2, a3
du3u3
]
ω
, a1du1u1
]+
[[b2dv2, a3
du3u3
]
ω
, b1dv1
]
ω
+
[[b2dv2, b3dv3]ω , a1
du1u1
]+ [[b2dv2, b3dv3]ω , b1dv1]ω
+
[[a3du3u3
, a1du1u1
]
ω
, a2du2u2
]
ω
+
[[a3du3u3
, a1du1u1
]
ω
, b2dv2
]
ω
+
[[a3du3u3
, b1dv1
]
ω
, a2du2u2
]
ω
+
[[a3du3u3
, b1dv1
]
ω
, b2dv2
]
ω
+
[[b3dv3, a1
du1u1
]
ω
, a2du2u2
]+
[[b3dv3, a1
du1u1
]
ω
, b2dv2
]
ω
+
[[b3dv3, b1dv1]ω , a2
du2u2
]+ [[b3dv3, b1dv1]ω , b2dv2]ω
r ♣rès ♠♠ ♦♥
[a1du1u1
, a2du2u2
]=a1u1
u1, a2du2u2
+a2u2
a1, u2du1u1
+ a1a2d
(1
u1, u2u1, u2
)
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
t ♦♥[[a1du1u1
, a2du2u2
], a3
du3u3
]
=
[a1u1
u1, a2du2u2
, a3du3u3
]+
[a2u2
a1, u2du1u1
, a3du3u3
]+
[a1a2d
(1
u1, u2u1, u2
), a3
du3u3
]
[a1u1
u1, a2du2u2
, a3du3u3
]
=a1u1u2
u1, a2u2, a3du3u3
+a3u3
a1u1
u1, a2, u3du2u2
+a1a3u1
u1, a2d(
1
u2u3u2, u3
)
[a2u2
a1, u2du1u1
, a3du3u3
]
=a2u1u2
a1, u2u1, a3du3u3
+a3u3
a2u2
a1, u2, u3du1u1
+
a2a3u2
a1, u2d(
1
u3u1u1, u3
)
[a1a2d(
1
u1, u2u1, u2), a3
du3u3
]
=a3u3
a1a2, u3d(1
u1u2u1, u2) + a1a2
1
u1u2u1, u2, a3
du3u3
+a1a2a3d
(1
u3 1
u1u2u1, u2, u3
)
Pr rs ♣r♦♣♦st♦♥ s♥t ♦♥♥ qqs ♣r♦♣rétés rtérstqs
r♦t P♦ss♦♥ ♦rt♠q ♣r♥♣
Pr♦♣♦st♦♥ ♦♥t ui ∈ S, ai ∈ A−S i = 1, 2, 3 t −,− ♥ str
tr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ I. ♥ s ♣r♦♣rétés s♥ts
P1
u3 1
u1u2u1, u2, u3+
1
u1 1
u2u3u2, u3, u1+
1
u2 1
u3u1u3, u1, u2 = 0
Pa1u1
a2u2
u2, a3, u1du3u3
=a1a2u1u2
u2, a3, u1du3u3
+
a1u1u2
a2, u1u2, a3du3u3
− a1a2u1u22
u2, a3u2, u1du3u3
Pa3u3
a1u1
u1, a2, u1du2u2
=a3a1u1u3
u1, a2, u3du2u2
+
a3u3u1
a1, u3u1, a2du2u2
− a3a1u3u21
u1, a2u1, u3du2u2
Pa3u3
a2u2
a1, u2, u3du1u1
=a3a2u3u2
a1, u2, u3du1u1
+
a3u3u2
a1, u2a2, u3du1u1
− a2a3u3u22
a1, u2u2, u3du1u1
Pa1u1
a3u3
a2, u3, u1du2u2
=a1a3u1u3
a2, u3, u1du2u2
+
a1u1u3
a2, u3a3, u1du2u2
− a1a3u1u23
a2, u3u3, u1du2u2
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
Pa2u2
a3u3
u3, a1, u2du1u1
=a2a3u2u3
u3, a1, u2du1u1
+
a2u2u3
a3, u2u3, a1du1u1
− a2a3u2u23
u3, a1u3, u2du1u1
Pa2u2
a1u1
a3, u1, u2du3u3
=a2a1u2u1
a3, u1, u2du3u3
+
a2u2u1
a3, u1a1, u2du3u3
− a2a1u2u21
a3, u1u1, u2du3u3
P a3a11
u3u1u3, u1, a2
du2u2
=a3a1u3u1
, u3, u1a2du2u2
−a3a1u1u23
u3, u1u3, a2du2u2
− a3a1u3u21
u3, u1u1, a2du2u2
P a2a31
u2u3u2, u3, a1
du1u1
=a2a3u2u3
, u2, u3, a1du1u1
−a2a3u2u23
u2, u3u3, a1du1u1
− a2a3u3u22
u2, u3u2, a1du1u1
P a1a31
u1u2u1, u2, a3
du3u3
=a1a2u1u2
u1, u2, a3du3u3
−a1a2u1u22
u1, u2u2, a3du3u3
− a1a2u2u21
u1, u2u1, a3du3u3
Pr ❱♦r ♥♥①
s ♣r♦♣rétés ♦♥ ♦t♥t [[a1du1u1
, a2du2u2
], a3
du3u3
]+
[[a2du2u2
, a3du3u3
], a1
du1u1
]+
[[a3du3u3
, a1du1u1
], a2
du2u2
]=
a1u1u2
u1, a2u2, a3du3u3
+a3a1u3u1
u1, a2, u3du2u2
+a3u3u1
u1, a2a1, u3du2u2
+
− a3a1u21u3
u1, a2u1, u3du2u2
+a1a3u1
u1, a2d(1
u2u3u2, u3) +
a2u2u1
a1, u2u1, a3du3u3
+
+a3a2u3u2
a1, u2, u3du1u1
+a3u3u2
a1, u2a2, u3du1u1
− a3a2u3u22
a1, u2u2, u3du1u1
+
a2a3u2
a1, u2d(1
u1u3u1, u3) +
a1a2u1u2
u1, u2, a3du3u3
− a1a2u1u22
u1, u2u2, a3du3u3
+
− a1a2u21u2
u1, u2u1, a3du3u3
+a3a1u3
a2, u3d(1
u1u2u1, u2) +
a3a2u3
a1, u3d(1
u1u2u1, u2)
+a1a2a3d(1
u3 1
u1u2u1, u2, u3)+
a2u2u3
u2, a3u3, a1du1u1
+a1a2u1u2
u2, a3, u1du3u3
+a1u1u2
u2, a3a2, u1du3u3
+
− a1a2u22u1
u2, a3u2, u1du3u3
+a2a1u2
u2, a3d(1
u3u1u3, u1) +
a3u3u2
a2, u3u2, a1du1u1
+
+a1a3u1u3
a2, u3, u1du2u2
+a1u1u3
a2, u3a3, u1du2u2
− a1a3u1u23
a2, u3u3, u1du2u2
+
a3a1u3
a2, u3d(1
u2u1u2, u1) +
a2a3u2u3
u2, u3, a1du1u1
− a2a3u2u23
u2, u3u3, a1du1u1
+
− a2a3u22u3
u2, u3u2, a1du1u1
+a1a2u1
a3, u1d(1
u2u3u2, u3) +
a1a3u1
a2, u1d(1
u2u3u2, u3)
+a2a3a1d(1
u1 1
u2u3u2, u3, u1)+
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
a3u3u1
u3, a1u1, a2du2u2
+a2a3u2u3
u3, a1, u2du1u1
+a2u2u3
u3, a1a3, u2du1u1
+
− a2a3u23u2
u3, a1u3, u2du1u1
+a3a2u3
u3, a1d(1
u1u2u1, u2) +
a1u1u3
a3, u1u3, a2du2u2
+
+a2a1u2u1
a3, u1, u2du3u3
+a2u2u1
a3, u1a1, u2du3u3
− a2a1u2u21
a3, u1u1, u2du3u3
+
a1a2u1
a3, u1d(1
u3u2u3, u2) +
a3a1u3u1
u3, u1, a2du2u2
− a3a1u3u21
u3, u1u1, a2du2u2
+
− a3a1u23u1
u3, u1u3, a2du2u2
+a2a3u2
a1, u2d(1
u3u1u3, u1) +
a2a1u2
a3, u2d(1
u3u1u3, u1)
+a3a1a2d(1
u2 1
u3u1u3, u1, u2)
tt r♥èr ①♣rss♦♥ ♥♦s és♦♥s q
Pr♦♣♦st♦♥ P♦r t♦s ai ∈ A t ui ∈ S i = 1, 2, 3, ♥
[[a1du1u1
, a2du2u2
], a3
du3u3
]+
[[a2du2u2
, a3du3u3
], a1
du1u1
]+
[[a3du3u3
, a1du1u1
], a2
du2u2
]= 0
Pr ❱♦r ♥♥①Pr rs ♥♦s ♦♥s s rt♦♥s s♥ts
[[a1
du1u1
, a2du2u2
]ω, b3dv3
]
ω
=a1u1u2
u1, a2u2, b3dv3 +b3a1u1
u1, a2, v3du2u2
+
b3u1
u1, a2a1, v3du2u2
− b3a1u21
u1, a2u1, v3du2u2
+a1b3u1
u1, a2d(1
u2u2, v3)+
a2u2u1
a1, u2u1, b3dv3 +b3a2u2
a1, u2, v3du1u1
+b3u2
a1, u2a2, , v3du1u1
+
−b3a2u22
a1, u2u2, v3du1u1
+a2b3u2
a1, u2d(1
u1u1, v3) +
a2a1u1u2
u1, u2, b3dv3+
− a1a2u21u2
u1, u2u1, b3dv3 −a1a2u1u22
u1, u2u2, b3dv3 + b3a1a2, v3d(1
u1u2u1, u2)
+b3a2a1, v3d(1
u1u2u1, u2) + a1a2b3d(
1
u1u2u1, u2, v3),
[[a2
du2u2
, b3dv3]ω, a1du1u1
]
ω
=a2u2
u2, b3v3, a1du1u1
+a1a2u1u2
u2, b3, u1dv3
+a1u1u2
u2, b3a2, u1dv3 −a1a2u1u22
u2, b3u2, u1dv3 +a1a2u2
u2, b3d(1
u1v3, u1)
+b3u2
a2, v3u2, a1du1u1
+a1b3u1
a2, v3, u1du2u2
+a1u1
a2, v3b3, u2du2u2
+a1b3a2, v3d(1
u1u2u2, u1) +
a2b3u2
u2, v3, a1du1u1
− a2b3u22
u2, a1u2, v3du1u1
+a1a2u1
b3, u1d(1
u2u2, v3) +
a1b3u1
a2, u1d(1
u2u2, v3)+
a2b3a1d(1
u1 1
u2u2, v3, u1)
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
t
[[b3dv3, a1
du1u1
]ω, a2du2u2
]
ω
=b3u1
v3, a1u1, a2du2u2
+a2b3u2
v3, a1, u2du1u1
+a2u2
v3, a1b3, u2du1u1
+ b3a2v3, a1d(1
u1u2u1, u2) +
a1u1
b3, u1v3, a2du2u2
+a2a1u1u2
b3, u1, u2dv3 +a2u1u2
b3, u1a1, u2dv3 −a2a1u21u2
b3, u1u1, u2dv3+a1a2u1
b3, u1d(1
u2v3, u2) +
b3a1u1
v3, u1, a2du2u2
− b3a1u21
v3, u3u1, a2du2u2
+a1a2u2
b3, u2d(1
u1v3, u1) +
a2b3u2
a1, u2d(1
u1v3, u1)+
a1b3a2d(1
u2 1
u1v3, u1, u2)
.
râ ①qs ♥♦s ♦t♥♦♥s ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ♦♥t ai, v3 ∈ A t ui ∈ S i = 1, 2. ♥
[[a2
du2u2
, b3dv3]ω, a1du1u1
]
ω
+
[[a1
du1u1
, a2du2u2
]ω, b3dv3
]
ω
+
[[b3dv3, a1
du1u1
]ω, a2du2u2
]
ω
= 0
Pr ❱♦r ♥♥①
♠rq ♦♥t u1, u3 ∈ S t a1, a3, b2, v2 ∈ A ♥ [[a1
du1u1
, b2dv2, ]ω, a3du3u3
]
ω
=a1u1
u1, b2v2, a3du3u3
+a3a1u3u1
u1, b2, u3dv3 +
a3u3u1
a1, u3u1, b2dv3 − a3a1u3u21
u1, b2u1, u3dv2 +a1a3u1
u1, b2d(1
u3v2, u3) +
b2u1
a1, v2u1, a3du3u3
+a3b2u3
a1, v2, u3du1u1
+a3u3
b2, u3a1, v2du1u1
+
a3b2a1, v2d(1
u1u3u1, u3) +
a1b2u1
u1, v2, a3du3u3
− a1b2u21
u1, a3u1, v2du3u3
+
a3a1u3
b2, u3d(1
u1u1, v2) +
a3b2u3
a1, u3d(1
u1u1, v2) +
a1b2a3d(1
u3 1
u1u1, v2, u3),
[[b2dv2, a3
du3u3
]ω, a1du1u1
]
ω
=b2u3
v2, a3u3, a1du1u1
+a1b2u1
v2, a3, u1du3u3
+a1u1
v2, a3b2, u1du3u3
+ b2a1v2, a3d(1
u3u1u3, u1) +
a3u3
b2, u3v2, a1du1u1
+a1a3u3u1
b2, u3, u1dv2 +a1u3u1
b2, u3a3, u1dv2 −a1a3u23u1
b2, u3u3, u1dv2+a3a1u3
b3, u3d(1
u1v2, u1) +
b2a3u3
v2, u3, a1du1u1
− b2a3u23
v2, u3u3, a1du1u1
+a3a1u1
b2, u1d(1
u3v2, u3) +
a1b2u1
a3, u1d(1
u3v2, u3)+
a3b3a1d(1
u1 1
u3v2, u3, u1)
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
t
[[a3
du3u3
, a1du1u1
]ω, b2dv2
]
ω
=a3u3u1
u3, a1u1, b2dv2 +b2a3u3
u3, a1, v2du1u1
+
b2u3
u3, a1a3, v2du1u1
− b2a3u23
u3, a1u3, v2du1u1
+a3b2u3
u3, a1d(1
u1u1, v2)+
a1u1u3
a3, u1u3, b2dv2 +b2a1u1
a3, u1, v2du3u3
+b2u1
a3, u1a1, v2du3u3
+
−b2a1u21
a3, u1u1, v2du3u3
+a1b2u1
a3, u1d(1
u3u3, v2) +
a1a3u3u1
u3, u1, b2dv2+
−a3a1u23u1
u3, u1u3, b2dv2 −a3a1u3u21
u3, u1u1, b2dv2 + b2a3a1, v2d(1
u3u1u3, u1)
+b2a1a3, v2d(1
u3u1u3, u1) + a3a1b2d(
1
u3u1u3, u1, v2).
tt r♠rq ♥♦s és♦♥s ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ P♦r t♦t u1, u3 ∈ S t a1, a3, b2, v2 ∈ A ♦♥
[[a1
du1u1
, b2dv2, ]ω, a3du3u3
]
ω
+
[[b2dv2, a3
du3u3
]ω, a1du1u1
]
ω
+
[[a3
du3u3
, a1du1u1
]ω, b2dv2
]
ω
= 0
Pr é♦ ♥ s♠♣ ♣♣t♦♥ ♥tté ♦ t ♣r♦♣rété ♥ts②♠étr −,−. ♦♥tr♦♥s ♣r ①♠♣ q
a3a1b2d(1
u3u1u3, u1, v2)
+a3b3a1d(1
u1 1
u3v2, u3, u1) + a1b2a3d(
1
u3 1
u1u1, v2, u3)
= 0
♣♣♦♥s t♦t ♦r q
1
u3 1
u1u1, v2, u3 =
1
u3u1u1, v2, u3 −
1
u3u21u1, u3u1, v2
♣s
1
u1 1
u3v2, u3, u1 =
1
u1u3v2, u3, u1 −
1
u1u23v2, u3u3, u1
t ♣s
1
u3u1u3, u1, v2 =
1
u1u3u3, u1, v2 −
1
u1u23u3, u1u3, v2+
− 1
u3u21u1, v2u3, u1.
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
s♥ st ♦♥ q
a1b2a3d(1
u3 1
u1u1, v2, u3) + a3a1b2d(
1
u3u1u3, u1, v2) + a3b3a1d(
1
u1 1
u3v2, u3, u1)
= a1b2a3d(1
u3 1
u1u1, v2, u3+ 1
u3u1u3, u1, v2+
1
u1 1
u3v2, u3, u1)
= a1b2a3d(1
u3u1u1, v2, u3 −
1
u3u21u1, u3u1, v2+
1
u1u3v2, u3, u1+
− 1
u1u23v2, u3u3, u1+
1
u1u3u3, u1, v2 −
1
u1u23u3, u1u3, v2 −
1
u3u21v2, u3u3, u1)
= a1b2a3d(1
u3u1(u1, v2, u3+ v2, u3, u1+ u3, u1, v2)+
−u1, v21
u3u21(u3, u1+ u1, u3)− u3, u1
1
u1u23(u3, v2+ v2, u3))
♥ ♦♥t râ à ♥tté ♦ r♦t −,− q
(u1, v2, u3+ v2, u3, u1+ u3, u1, v2) = 0
♦ù
−u1, v21
u3u21(u3, u1+ u1, u3)− u3, u1
1
u1u23(u3, v2+ v2, u3 = 0
♦♥t ♣r été ré
s éts ♣r s♦♥t ♦♥♥és ♥ ♥♥①
♦♥t u1 ∈ S t a1, b2, b3, v2, v3 ∈ A − S. ♣rès é♥t♦♥ [−,−]ω t s
♣r♦♣rétés −,−, ♥♦s ♦♥s
[[u1du1u1
, b2dv2]ω, b3dv3]ω =a1u1
u1, b2v2, b3dv3 +b3a1u1
u1, b2, v3dv2
+b3u1
a1, v3u1, b2dv2 −b3a1u21
u1, b2u1, v3dv2 +a1b3u1
u1, b2d(v2, v3)
+b2u1
a1, v2u1, b3dv3 + b3b2a1, v2, v3du1u1
+ b3b2, v3a1, v2du1u1
+b2b3a1, v2d(1
u1u1, v3) +
a1b2u1
u1, v2, b3dv3 −a1b2u21
u1, v2u1, b3dv3+
b3a1b2, v3d(1
u1u1, v2) + b3b2a1, v3d(
1
u1u1, v2) + a1b2b3d(
1
u1u1, v2, v3),
[[b2dv2, b3dv3]ω, u1du1u1
]ω = b2v2, b3v3, a1du1u1
+a1b2u1
v2, b3, u1dv3
+a1u1
b2, u1v2, b3dv3 + a1b2v2, b3d(1
u1v3, u1) + b3b2, v3v2, a1
du1u1
+a1b3u1
b2, v3, u1dv2 +a1u1
b3, u1b2, v3dv2 + a1b3b2, v3d(1
u1v2, u1)
+b1b3v2, v3, a1du1u1
+a1b2u1
b3, u1d(v2, v3) +a1b3u1
b2, u1d(v2, v3)
+a1b2b3d(1
u1v2, v3, u1)
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
t
[[b3dv3, u1du1u1
]ω, b2dv2]ω =b3u1
v3, a1u1, b2dv2 + b2b3v3, a1, v2du1u1
+b2b3, v2v3, a1d(1
u1u1, v2) +
a1u1
b3, u1v3, b2dv2 +b2a1u1
b3, u1, v2dv3
+b2u1
a1, v2b3, u1dv3 −b2a1u21
u1, v2b3, u1dv3 +a1b2u1
b3, u1d(v3, v2)
+b3a1u1
v3, u1, b2dv2 −b3a1u21
u1, b2v3, u1dv2 + b3b2a1, v2d(1
u1v3, u1)+
+b2a1b3, v2d(1
u1v3, u1) + a1b2b3d(
1
u1v3, u1, v2)
♣rès rr♦♣♠♥t ♦♥ ♠♦♥tr à ♥tté ♦ r♦t P♦ss♦♥
−,− q
[[b3dv3, u1du1u1
]ω, b2dv2]ω + [[b2dv2, b3dv3]ω, u1du1u1
]ω + [[u1du1u1
, b2dv2]ω, b3dv3]ω = 0
♠ê♠ ♦♥ ♠♦♥tr q
♥ t♥t s ssttt♦♥s
a1 // a2 u1 // u2 b2 // b3 v2 // v3 b3 // b1 t
v3 // v1 ♦♥ ♦t♥t
[[b1dv1, u2du2u2
]ω, b3dv3]ω+[[b3dv3, b1dv1]ω, u2du2u2
]ω+[[u2du2u2
, b3dv3]ω, b1dv1]ω = 0
♥ t♥t s ssttt♦♥s a1 // a3 u1 // u3 b2 // b1
v2 // v1 b3 // b2 t v3 // v2 ♦♥ ♦t♥t
[[b2dv2, u3du3u3
]ω, b1dv1]ω+[[b1dv1, b2dv2]ω, u3du3u3
]ω+[[u3du3u3
, b1dv1]ω, b2dv2]ω = 0
è ♣r ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ♦♥t u1 ∈ S t a1, b2, b3, v2, v3 ∈ A−S. ♣rès é♥t♦♥
[−,−]ω t s ♣r♦♣rétés −,−, ♥♦s ♦♥s
[[b3dv3, u1du1u1
]ω, b2dv2]ω + [[b2dv2, b3dv3]ω, u1du1u1
]ω +
[[u1du1u1
, b2dv2]ω, b3dv3]ω = 0
[[b1dv1, u2du2u2
]ω, b3dv3]ω + [[b3dv3, b1dv1]ω, u2du2u2
]ω +
[[u2du2u2
, b3dv3]ω, b1dv1]ω = 0
[[b2dv2, u3du3u3
]ω, b1dv1]ω + [[b1dv1, b2dv2]ω, u3du3u3
]ω +
[[u3du3u3
, b1dv1]ω, b2dv2]ω = 0.
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
é♦ s ♣r♦♣♦st♦♥s t ♥érté [−,−]ω,
q
é♦rè♠ ♦t (A, −,−) ♥ èr P♦ss♦♥ ♦rt♠q ♣r♥
♣ ♦♥ ♥ é I ♥♥ré ♣r S := u1, ..., up. r♦t [−,−]ω é♥ ♣r
♥t sr ΩA(log I) ♥ strtr èr
♦♥strt♦♥ ♥ r♣rés♥tt♦♥ ♣r s ért♦♥s ♦rt
♠qs ΩA(log I)
♦s s♦♥s q ♣♣t♦♥ ♠t♦♥♥♥ H : ΩA → DerA t♦t strtr
P♦ss♦♥ sr A st ♥ ♠♦r♣s♠ èrs stss♥t ♦♥t♦♥
♦♠♣tté r à s♦s st♦♥ ♥♦s ♠♦♥tr♦♥s q ♥s s s
strtrs P♦ss♦♥ ♦rt♠qs ♣r♥♣s ♦♥ I tt ♣♣t♦♥ s
♣r♦♦♥ ♥ ♥ ♣♣t♦♥ A♥ér H : ΩA(log I) → DerA(log I). ♦t x ①é
♥s ΩA(log I) ♣♣t♦♥ ρω(x) : A → A é♥ ♣r
ρω(x)(a) = ω(x, d(a)) st ♥ Rért♦♥ sr A.♥ t ♣♦r t♦t a ∈ A,ρω(x)(a) =
p∑i=1xiρω(
duiui
)(a) +n∑p+1
xiρω(dvi) =p∑i=1
xiuiui, a+
n∑p+1
xivi, a
♦♥ ρω(x) =p∑i=1
xiuiui,−+
n∑p+1
xivi,−. ♦♥ ρω(x) st ♥ ért♦♥ ♦rt
♠q ♦♠♠ s♦♠♠ s ért♦♥s ♦rt♠qs ♥s ①st ♥ ♦♠♦♠♦r
♣s♠ A♠♦ ρω : ΩA(log I) → DerA(log I) q à t♦t x ∈ ΩA(log I)ss♦ ρω(x).
♥ ρω = H.
♦♥t u ∈ I∗ t a, b ∈ A ts q adu
u∈ ΩA(log I). ♣rès q ♣réè
ω(adu
u, db) =
a
uu, b. ♦♥ ρω(a
du
u)(b) =
a
uu, b =
a
u(ad(u))(b) t ♦♥
ρω(adu
u) =
a
uu,−.
♥s
ρω[adu
u, bdv
v] = ρω
(a
uu, bdv
v+b
va, vdu
u+ abd(
1
uvu, v)
)
=a
uu, bρω(
dv
v) +
b
va, vρω(
du
u) + abρω(d(
1
uvu, v))
=a
uvu, bv,−+ b
vua, vu,−+ ab 1
uvu, v,−
=a
uvu, bv,−+ b
vua, vu,−+ ab
uvu, v,−+
− ab
u2vu, vu,− − ab
uv2u, vv,−
Pr rs ♦♥
♦♥strt♦♥ érq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
ρω(adu
u)
(ρω(b
dv
v)
)=
a
uu, b
vv,−
=a
uvu, bv,−+ ab
uu, 1
vv,−
=a
uvu, bv,−+ ab
uvu, v,− − ab
uv2u, vv,−,
ρω(bdv
v)
(ρω(a
du
u)
)=
b
vv, a
uu,−
=b
uvv, au,−+ ab
vv, 1
uu,−
=b
uvv, au,−+ ab
uvv, u,− − ab
vu2v, uu,−.
♦♥ [ρω(adu
u), ρω(b
dv
v)] =
a
uvu, bv,− +
ab
uvu, v,− − ab
uv2u, vv,− +
b
uvv, au,−− ab
uvv, u,−+ ab
vu2v, uu,−. r ♣rès ♥tté ♦
u, v,− − v, u,−+ −, u, v = 0.
♦♥ [ρω(adu
u), ρω(b
dv
v)] =
a
uvu, bv,− − ab
uv2u, vv,− − b
uvv, au,− +
ab
vu2v, uu,−+ ab
uvu, v,− − ab
uv2u, vv,−.
t ♦♥ ρω([adu
u, bdv
v]ω) = [ρω(a
du
u), ρω(b
dv
v)].
♠ê♠ ♦♥ é♠♦♥tr q ρω[adu
u, bdv] = [ρω(a
du
u), ρω(bdv)] t ρω[adu, bdv] =
[ρω(adu), ρω(bdv)]. ♥ ♦♥ ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ♦t (A; −′−) ♥ èr P♦ss♦♥ ♦rt♠q ♦♥
I. ♣♣t♦♥ A♥ér ρω : x 7→ ρω(x) st ♥ ♠♦r♣s♠ èrs
♠rq♦♥s ss q
[du
u, adv
v]ω =
1
uu, adv
v+ ad(
1
uvu, v)
=1
uu, adv
v+ a[
du
u,dv
v]
=
(1
uu,−
)(a)
dv
v+ a[
du
u,dv
v]
= ρω(du
u)(a)
dv
v+ a[
du
u,dv
v]
♣r♦♣♦st♦♥ s♥t é♥érs tt ♣r♦♣rété
Pr♦♣♦st♦♥ P♦r t♦s ωj ∈ ΩA(log I) t f ∈ A, ♦♥
[ωi, fωj ] = f [ωi, ωj ] + (ρω(ωi)(f))ωj .
Pr ❱♦r ♥♥①
♥ ♥s é♠♦♥tré é♦rè♠ s♥t
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
é♦rè♠ ♦t strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ ♥
é I ♥ Rèr A ♥t sr ΩA(log I) ♥ strtr ♥rt
tr♠♥t t ♣♦r t♦t strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ ♦♥ ♥
é I, (ΩA(log I), ρω, [−,−]) st ♥ èr ♥rt
②♥t ♠♥ sr ΩA(log I), ♥ strtr ♥rt ♦♥ ♣t ♦ré♥♥t
♣♣qr t♥q Ps t ♥rt ♣♦r ♦♥strr ♥ ♦♠♣① ♥
q ♥♦s ♣r♠ttr ♦♥strr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q P♦r
♣♦s♦♥s LaltA(ΩA(log I),M) ♥s♠ s ♣♣t♦♥s ♠t♥érs ♥t
s②♠étrqs sr ΩA(log I) à rs ♥s ♥ A♠♦ ♥rt M.
LaltA(ΩA(log I),M) st ♥ Rèr ré ♦♠♠tt ♣♦r ♦
sté♥ ♣r
α ∧ β(xi, ..., xp+q) =∑
σ
εσµ(α(xσ(1), ..., xσ(p))⊗ β(xσ(p+1), ..., xσ(p+q)))
♦ù µ : M ⊗M → M st ♥ ♠♦r♣s♠ ΩA(log I)♠♦s ♠♥ ér♥
t dρω rt♥②♥r ss♦é à r♣rés♥tt♦♥ ρω é♥ ♣r
dρω(f)(α0, ...αp) =p∑i=0
(−1)iρω(αi)f(α0, ...αi, ...αp)+∑i,j(−1)i+jf([αi, αj ], α0, ..., αi, ..., αj , ..., αp)
♦♥ ♦t♥t ♥ èr ér♥t ré ♦♥t ♦♦♠♦♦ ss♦é st
♥♦té H∗PS (A, −,−;M) . r H∗
PS (A, −,−;M) = Ext(U(A,ΩA(log I)))(A,M) s
ΩA(log I) ♦♠♠ A−♠♦ st ♣r♦t ♥ ♦♣t ♦♥ é♥t♦♥ s♥t
é♥t♦♥ H∗PS (A, −,−;M) st ♣♣é ♦♦♠♦♦ P♦ss♦♥ ♦rt
♠q à rs ♥s ♠♦ ♥rt M.
♣rès q ♣réè ♦r♠ ω ♥t ♣r tt strtr P♦ss♦♥ st ♥
éé♠♥t Lalt2A(ΩA(log I),A). ♥ s ♠♥ s ♥st ♣s ♥ ♦②
♦♠♣① Lalt∗A(ΩA(log I),A). ♣r♦♣♦st♦♥ s♥t ♣♣♦rt ♥ ré♣♦♥s à tt
♣ré♦♣t♦♥
Pr♦♣♦st♦♥ ♦r♠ ω st ♥ ♦② Lalt∗A(ΩA(log I),A).
Pr ❱♦r
♥ ♥♦tr [ω−,−] ss ♦♦♠♦♦ ω
é♥t♦♥ [ω−,−] st ♣♣é ss P♦ss♦♥ ♦rt♠q
(A, −,−; I).
♦♥strt♦♥ é♦♠étrq ♦♦♠♦♦
P♦ss♦♥ ♦rt♠q
♥ ♠♦♥tr ♥s ❬t♦ ❪ q ♣r (ΩX,p(logD), DerX,p(logD)) st ré①
P♦r t♦t δ ∈ DerX,p(logD) t α ∈ ΩX,p(logD) ♦♥ ♥♦t
(δ|α) = iδ(α).
♦♥strt♦♥ é♦♠étrq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
♦ù (−|−) és♥ r♦t té ♥tr ΩX,p(logD) t DerX,p(logD). ♦s
♦♥s ♠♦♥tré ♣tr q t♦ts s st♦♥s ΩX(logD) s♦♥t ♦r♠
gα =dh
h+ η
♦ù g st ♥ ♦♥t♦♥ ♦♦♠♦r♣ srD t q dimCD∩z ∈ U : g(z) = 0 ≤ n−2
r ♣rès s ♦♥strt♦♥s st♦♥ ♣♣t♦♥ ♠t♦♥♥♥ H ♥
s é♥t q ♣♦r s ♦r♠s ②♥t s ♣ôs ♥q♠♥t sr D. tr♠♥t t
s ♦♥strt♦♥s ♥ s♦♥t ts q ♣♦r ♥ ss ♣rés srs P♦r
ts srs ΩX,p(logD) ♦t êtr ♥♥ré ♣r s ♦r♠s r♠és s rtérs
tqs ♥ t sr s♦♥t ♦♥♥és ♣r é♦rè♠
♥s tt st♦♥ ♥♦s s♣♣♦sr♦♥s ♥ ♣s q D stst s ②♣♦tèss
é♦rè♠ t q ♦♥t♦♥ é♥t♦♥ h D st rrét Pr rs
♦♥ s♣♣♦s q X st éq♣é ♥ strtr P♦ss♦♥ −,− ♦rt♠q
♦♥ é ID é♥t♦♥ D. ♦♠♠ à st♦♥ ♥♦s és♥r♦♥s ♣r
H : ΩX → DerX ♣♣t♦♥ ♠t♦♥♥♥ ss♦é à tt strtr P♦ss♦♥
♦tr s♦ st ♣r♦♦♥r H sr ΩX(logD) Psq t♦ts s st♦♥s
ΩX(logD) ♣♥t s ♠ttr s♦s ♦r♠ ω = gdh
h+η
g g ∈ OX t η ∈ ΩX
♦rs ♣♦r t♦t δ ∈ DerX(logD), ω ∈ ΩX(logD) ♦♥
Lδgω = −1
g
δh
h
dh
h+
1
ghLδdh+
1
gLδη −
δ.g
gω
H ét♥t ♣♣t♦♥ ♠t♦♥♥♥ ♥ strtr P♦ss♦♥ ♦♥
P♦r t♦t α1, α2, α3 ∈ ΩX
(H(α1)|α2) + (α1|H(α2)) = 0 (s♦tr♦♣)
(LHα1α2|Hα3)+ = 0
♥ ♣♦s
Hα := H(α0dh
h+ α1) =
α0
hH(dh) +H(α1.)
st ♣♣t♦♥ ♠t♦♥♥♥ ♦rt♠q ss♦é à strtr P♦ss♦♥
♦rt♠q ♣r♥♣ ♣♣t♦♥ ♠t♦♥♥♥ H. Pr rs
Lα0
hH(dh)+H(α1)
α =α0
hLH(dh)α−H(dh).α
dα0
h+α0
hH(dh)α
dh
h+ LH(α1)α
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♥ s ♠♥r s H ér s rt♦♥s s♠rs à P♦r ♦♥ r♠r
qr q ♣♦r t♦t αi =dh
h+ α1
i , i = 1, 2, 3 ♦♥
(LH(α1)
α2|H(α3))
=
(1
hLH(dh)α
12|1
hH(dh)
)−
(H(dh)(α1
2)
h
dh
h| 1hH(dh)
)+
(1
hLH(dh)α
12|H(α1
3)
)
−(H(dh)(α1
2)
h
dh
h|H(α1
3)
)−(H(α1
1)h
h
dh
h| 1hH(dh)
)−
(H((α1
1)
h
dh
h|H(α1
3)
)
+
(1
hLH(α1
1)dh|
1
hH(dh)
)
+
(1
hLH(α1
1)dh|H(α1
3)
)+
(LH(α1
1)α
12|1
hH(dh)
)+
(LH(α1
1)α
12|H(α1
3))
♥ ♣♦s
Gr(H) := H(α)⊕ α, α ∈ Ω1X(log ID)
s étés t ♥♦s ♣r♠tt♥t é♠♦♥trr té♦rè♠ s♥t ♦♥t
s éts ♣r s♦♥t r♥♦②és ♥ ♥♥①
é♦rè♠ ♦t H ♣♣t♦♥ ♠t♦♥♥♥ ♥ strtr P♦ss♦♥
♦rt♠q ♣r♥♣ ♣♣t♦♥ ♠t♦♥♥♥ H.
H : ΩX(logD) → DerX(logD) stst s ♣r♦♣rétés s♥ts
Gr(H) st s♦tr♦♣
P♦r t♦t αi, αj , αk ∈ ΩX(log ID) ♦♥ (LH(αi)
α2|H(α3))+ = 0
♥ ♥ ét ♦r♦r s♥t
♦r♦r P♦r t♦ts st♦♥s α1, α2 ΩX(logD), ♦♥
[Hα1, Hα2] = H(iHα1dα2 − iHα2
dα1 + d(Hα1, α2))
Pr ♦♥t α1, α2 ① st♦♥s ΩX(logD), ♣rès té♦rè♠ ♦♥
0
= −(LHα1α2|Hα3)+
= (HLHα1α2|α3)− (LHα2
α3, Hα1)− (LHα3α1|, Hα2)
= (HLHα1α2|α3)− (LHα2
α3, Hα1)− (iHα3dα1 + diHα3
α1|Hα2)
= (HLHα1α2|α3)− (LHα2
α3|Hα1)− dα1(Hα3|Hα2)− (diHα3α1|Hα2)
= (HLHα1α2|α3)− (LHα2
α3|Hα1) + dα1(Hα3|Hα2)− (diHα3α1|Hα2)
= (HLHα1α2|α3)− (LHα2
α3|Hα1) + (iHα2dα1|Hα3)− (diHα3
α1|Hα2)
= (HLHα1α2|α3)− (HiHα2
dα1, α3)− (diHα3α1|Hα2)− (LHα2
α3|Hα1)
= (HLHα1α2 − HiHα2
dα1|α3)− (diHα3α1|Hα2)− (LHα2
α3, Hα1)
= (HLHα1α2 − HiHα2
dα1|α3)− (diHα3α1|Hα2)− (iHα2
dα3 + diHα2α3|Hα1)
= (HLHα1α2 − HiHα2
dα1|α3)− (d(iHα3α1)|Hα2)− (iHα2
dα3|Hα1)− (diHα2α3|Hα1)
= (HLHα1α2 − HiHα2
dα1, α3)− Hα2(Hα3|α1)− Hα1(Hα2|α3)− dα3(Hα2, α1)
= (HLHα1α2 − HiHα2
dα1|α3)− Hα2(Hα3|α1)− Hα1(Hα2|α3) + (α3, [Hα2, Hα1])+
+Hα1(α3|Hα2)− Hα2(α3|Hα1)
= (HLHα1α2 − HiHα2
dα1 − [Hα2, Hα1]|α3)
♦♥strt♦♥ é♦♠étrq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
♦ù réstt
qs strtrs èr ss♦és ① strtrs P♦ss♦♥ ♦rt♠qs
P♦r t♦t m ∈ MD := OX [D] ♦♥ Hd log(m) ∈ DerX(logD).
MD és♥ s♦ss MX s s ♦♥t♦♥s ♠ér♦♠♦r♣s sr
X s ♦♥t♦♥s ♠ér♦♠♦r♣s ♣ôs sr D.
♦s r♣♣♦♥s q ♣♦r t♦t strtr P♦ss♦♥ ♦♦♠♦r♣ é♥ ♣r ♥
♣♣t♦♥ ♠t♦♥♥♥ H, s ♦♥t♦♥s ♠t♦♥♥♥s s♦♥t t♦ts ♦♦♠♦r♣s
sr X. ♥ ét rt♦♥ Hd log(m) ∈ DerX(logD) q rt♥s sss
♦♥t♦♥s ♠ér♦♠♦r♣s ♣♥t êtr ♠t♦♥♥♥s ♦rt♠qs st s s
♦♥t♦♥s ♠ér♦♠♦r♣s t②♣
m =
r∏
i=1
g
hrii
♦ù h =r∏i=1hi st ♦♥t♦♥ é♥t♦♥ D t g ♥ ♦♥t♦♥ s♥s ③ér♦s sr D.
♦s r♣♣♦♥s q t♦t strtr P♦ss♦♥ −,− s ♣r♦♦♥ ♠♥èr ♥q
♣r
u, abs =
1
bu, a − a
b2u, b
♥ ♥ ♥q strtr P♦ss♦♥ −,−s sr MX .
♥ st q ♣♦r t♦t m1,m2 ∈ MD s ①st♥t λ1, λ2 ∈ Z t a1, a2 ∈ O∗X ts q
mi =aihλi
tdmi
mi= ε(λi)λi
dh
h+daiai
♦ù ε(λi) és♥ s♥ λi.
♥ ♦♥sèr sr MD r♦t s♥t
m1,m2D =
(Hdm1
m1|dm2
m2) s mi ∈ MD −OX
(Hdm1|dm2
m2) s m2 ∈ MD −OX t m1 ∈ OX
(Hdm1|dm2) s mi ∈ OX
r♦t ♣♦ssè s ♣r♦♣rétés s♥ts
Pr♦♣♦st♦♥ r♦t −,−D ér s étés s♥ts
−,−D st C♥ér ♥ts②♠étrq
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
m1,m2D =
1
m1m2m1,m2s s mi ∈ MD −OX
1
m2m1,m2s s m2 ∈ MD −OX t m1 ∈ OX
m1,m2 s mi ∈ OX
,
−,−D st ♥ ért♦♥ ♦rt♠q sr MD − OX ♥ ♥ ss
♦♠♣♦s♥ts
P♦r t♦s m1,m2 ∈ MD −OX ,1
m1m2m1,m2s ∈ OX .
Pr é♦ s ♣r♦♣rétés ♦r♠s ♦rt♠qs
♥ ♥ ét ♦r♦r s♥t
♦r♦r −,−D st ♥ strtr sr s MD ♣r♦♦♥♥t
−,−Pr t ♠♦♥trr q −,−D ér ♥tté ♦ sr s st♦♥s
rst♥ts MD. P♦r ♦♥ st♥r tr♦s s
s u, v ∈ MD −OX t a ∈ OX .
s v ∈ MD −OX t a, b ∈ OX .
s u, v, w ∈ MD −OX .
♥ s♣♣♦s u, v ∈ MD −OX t a ∈ OX ♦rs
u, v, aDD = u, 1vv, asD
=1
uvu, v, ass −
1
uv2u, vsv, as
s♥st ♦♥ q
u, v, aDD+ =
=1
uvu, v, ass −
1
uv2u, vsv, as+
1
uvv, a, uss −
1
u2va, usv, us+
1
uva, u, vss −
1
uv2u, vsa, vs
− 1
u2vu, vsa, us
ç♦♥ ♥♦ ♦♥ ♠♦♥tr s trs s s trs éts tt ♣r s♦♥t
♦♥♥és ♥ ♥♥①
♥ ♥ ér s ♣r♦♣rétés s♥ts s r♦ts −,−s t −,−DPr♦♣♦st♦♥ s r♦ts −,−s t −,−D ér♥t s ♣r♦♣rétés s
♥ts sr MX −OX
m1,m2D(m1,m2D,m3D + m2,m3D + m1,m3D)+ = 0
1
m1m2,m3sm2,m3s,m1s−
1
m2m3m2,m1s−
1
m3m1m3,m1s+ = 0
♦♥strt♦♥ é♦♠étrq ♦♦♠♦♦ P♦ss♦♥
♦rt♠q
trtrs èr ♥rt sr ΩX(logD)
Préé♠♠♥t ♥♦s ♦♥s ♠♦♥trr q t♦t strtr P♦ss♦♥ ♦rt♠q
♥t ♥ ♠♦r♣s♠ s① H : ΩX(logD) −→ DerX(logD). ♦s ♦♥s à
♣rés♥t ♠♦♥trr q ♠♦r♣s♠ st ♥ strtr ♥rt
P♦r t♦t α := α1dh
h+ αi1dxi, β = β1
dh
h+ βj1dxj .
♥ é♥t sr ΩX(logD) r♦t s♥t
[α, β]
=α1
hh, β1
dh
h+β1hα1, h
dh
h+α1
hh, βjdxj+
+βjα1, xjdh
h+ α1β
jd(1
hh, βj) + αixi, β1
dh
h+
+β1hαi, hdxi + αiβ1d(
1
hxi, h) + αixi, βjdxj + βjαi, xjdxi + αiβjdxi, xj,
t ♦♥ été s♥t
[α, aβ] =
a(α1
hh, β1
dh
h+β1hα1, h
dh
h+α1
hh, βjdxj + βjα1, xj
dh
h+
+α1βjd(
1
hh, xj) + αixi, β1
dh
h+β1hαi, hdxi
+β1αid(
1
hxi, h) + αixi, βjdxj + βjαi, xjdxi + αiβjdxi, xj)
+α1
hh, adh
h+α1β
j
hh, adxj
+αiβ1xi, adh
h+ αiβjxi, adxj
q ♣rès rr♦♣♠♥t ♥♦s ♦♥♥
[α, aβ] = H(α)(a)β + a[α, β]
♥s ♦♣tq ♠♥r ΩX(logD) ♥ strtr èr ♥rt ♠♦♥
tr♦♥s ♠♠ ss♥t s♥t
♠♠ r♦t [−,−] é♥t ♥s ΩX(logD) ♥ strtr èr
♥rt
Pr ♦♥t α1, α2, α3 ∈ ΩX(logD).
[[α1, α2], α3]
= [LHα1α2 − iHα2
dα1, α3]
= −[α3,LHα1α2 − iHα2
dα1]
= iH(LHα1α2−iHα2
dα1)dα3 − LHα3
(LHα1α2 − iHα2
dα1).
r ♣rès ♦r♦r ♦♥
H(LHα1α2 − iHα2
dα1) = [Hα1, Hα2].
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦♥
[[α1, α2], α3]
= i[Hα1,Hα2]dα3 − LHα3
LHα1α2 + LHα3
iHα2dα1
= i[Hα1,Hα2]dα3 − LHα3
LHα1α2 + LHα3
LHα2− LHα3
diHα2α1
= i[Hα1,Hα2]dα3 − LHα3
LHα1α2 + LHα3
LHα2− dLHα3
iHα2α1.
.
Pr rs L ét♥t ♥ ♥♦♠♦r♣s♠ DerX(logD), s♥st q
[[α1, α2], α3]+ = i[Hα1,Hα2]dα3 + L[Hα3,Hα2]α1
− dLHα2iHα2
α1+
tr ♣rt ♦r♠ ♠q rt♥ t s étés ♣♣qés à α3 t
H(α2) ♦♥♥♥t
LHα2iHα2
α1 = i[Hα3,Hα2]+ iHα2
LHα3α1. tt r♥èr rt♦♥ ♥t q
−dLHα3iHα2
α1 = −d(LHα3
|Hα2
)− L[Hα3,Hα2]
α1 + i[Hα3,Hα2]dα1.
♥ sstt♥t −dLHα3iHα2
α1 ♥s ①♣rss♦♥ [[α1, α2], α3]+ sss ♦♥
♦t♥t
[[α1, α2], α3]+
= i[Hα1,Hα2]dα3 + L[Hα3,Hα2]
α1 − d(LHα3
|Hα2
)− L[Hα3,Hα2]
α1 + i[Hα3,Hα2]dα1+
= i[Hα1,Hα2]dα3 + i[Hα3,Hα2]
dα1 − d(LHα3
|Hα2
)+
= i[Hα1,Hα2]dα3 + i[Hα3,Hα2]
dα1 + i[Hα2,Hα3]dα1 + i[Hα1,Hα3]
dα2+
+i[Hα3,Hα1]dα2 + i[Hα2,Hα1]
dα3 − d((
LHα3|Hα2
)+
)
= d((
LHα3|Hα2
)+
)
r ♣rès é♦rè♠ (LHα3
|Hα2
)+ = 0.
♦ù réstt
♥ ♥ ét ss ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ H st ♥ strtr èr ♥rt sr ΩX(logD)
Pr ❱♦r ♥♥①
♥♦s ♣♦s♦♥s Laltp(ΩX(logD)) s s p♦r♠s OX ♥érs ♥t
s②♠étrqs sr ΩX(logD) t
Lalt(ΩX(logD)) =n⊕p=0
Laltp(ΩX(logD)). ♦rs ♣♣t♦♥
(∂Df)(α1, ..., αp) =n∑i=1
(−1)i−1H(αi)f(α1, ..., αi, ..., αp)+∑i≤j
(−1)i+jf([αi, αj ], α1, ..., αi, ..., αj , ..., αp)
ér
♠♠ ∂2D = 0
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
Pr é♦ rt♦♥ t ♥tté ♦ r♦t
[−,−].
♥ rést q (Lalt∗(logD), ∂D) st ♥ ♦♠♣① ♥s ♥ ♥ ét
é♥t♦♥ s♥t
é♥t♦♥ ♦♦♠♦♦ ♦♠♣① (Lalt∗(logD), ∂D) st ♣♣é ♦♦
♠♦♦ P♦ss♦♥ ♦rt♠q rété P♦ss♦♥ ♦rt♠q X
kime r♦♣ ♦♦♠♦♦ ♦♠♣① sr ♥♦té HkPS(X) t kime r♦♣
♦♦♠♦♦ P♦ss♦♥ ss♦é sr ♥♦té HkP (X).
①♠♣s s r♦♣s ♦♦♠♦♦s
P♦ss♦♥
♦rt♠qs
r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠qs s strtrs ♦s②♠♣tqs
♦t (L, [−,−], ρ, I) ♥ èr ♥rt ♦rt♠q ♦♠♠ ♥s
❬♦♥♦ ❪ ♥♦s ♦♣t♦♥s é♥t♦♥ s♥t
é♥t♦♥ ♥ ♣♣ strtr èr ♥rt P♦ss♦♥ ♥s L ♦
rt♠q ♦♥ I t♦t ♦r♠ µ sr L dρr♠é
♦rsq µ st ♥ strtr èr ♥rt P♦ss♦♥ ♦rt♠q
(L, ρ, µ) st ♣♣é èr ♥rt P♦ss♦♥ ♦rt♠q ♥ r q
L st ♥ èr ♥rt P♦ss♦♥ ♦rt♠q ♦rsq ①st sr L ♥
strtr ♥rt P♦ss♦♥ sr L ♦rt♠q A st ♥ èr P♦ss♦♥
♦r♠ ss♦é ω, ♦rs
dH(ω) = 0
♥ t ♣♦r t♦t a, b, c ∈ A ♦♥
dH(ω)(da, db, dc) = H(da)ω(db, dc)−H(db)ω(da, dc) +H(dc)ω(da, db)
−ω(da, b, dc) + ω(da, c, db)− ω(db, c, da)= −2(Jacobi(a, b, c))
♥ ♦♥t ♦♥ q t♦t ♦r♠ P♦ss♦♥ sr A ♥t sr ΩA ♥ strtr
èr ♥rt P♦ss♦♥ ♥ st ♠ê♠ ♣♦r s ♦r♠s P♦ss♦♥
♦rt♠qs q ♥s♥t sr Ω1A(log I) s strtrs èr ♥rt
P♦ss♦♥ ♦rt♠qs
tt ♥♦t♦♥ strtr èr ♥rt P♦ss♦♥ ♦rt♠q st é
strtr èr ♥rtP♦ss♦♥s②♠♣tq ♦rt♠q
♥ P t réér♥ à ♥s P♦ss♦♥ ♦rs st ♠s ♣♦r ②♦ t♦
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
é♥t♦♥ ♥ ♣♣ strtr èr ♥rtP♦ss♦♥s②♠♣tq
♦rt♠q ♥s L t♦t strtr èr ♥rt P♦ss♦♥
♦rt♠q µ sr L ♣♦r q ♣♣t♦♥
L → HomA(L,A)
x 7→ ıxµ
st ♥ s♦♠♦r♣s♠ A♠♦s
s♥ st q ♥s t♦t rété ♦s②♠♣tq (X,ω,D) ω st ♥ strtr
èr ♥rtP♦ss♦♥ s②♠♣tq ♦rt♠q sr DerX(logD).
♦s ♦♥s à ♣rés♥t ♠♦♥trr q s strtrs èr ♥rtP♦ss♦♥
s②♠♣tq ♦rt♠q s♦♥t ♥tèr♠♥t rtérsés ♣r H.
♦t µ ♦r♠ ss♦é à ♥ strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ −,− ♦♥ ♥ é I A t µ ♥ strtr èr ♥rtP♦ss♦♥
s②♠♣tq ♦rt♠q
♥s st s strtrs èr ♥rts②♠♣tq ♦rt♠qs
sr♦♥t s♠♣♠♥t ♣♣é strtr èr ♥rt♦s②♠♣tq
Pr♦♣♦st♦♥ µ st ♥ strtr èr ♥rt♦s②♠♣tq
sr ΩA(log I) s t s♠♥t s H st ♥ s♦♠♦r♣s♠ A♠♦s
Pr ♣♣♦s♦♥s q H st ♥ s♦♠♦r♣s♠
♦t x, y ∈ ΩA(log I) ts q I(x) = I(y).
♦rs
−σ(H(x)) = I(x)
= I(y)
= −σ(H(y))
i.e. H(x) = H(y)
i.e. x = y
é♣r♦q♠♥t s♦t ψ ∈ H(ΩA(log I),A). r♦♥s x ∈ ΩA(log I) t q I(x) =ψ.
Psq ψ ∈ Hom(ΩA(log I),A) ∼= DerA(log I) = H(ΩA(log I)) ♦rs ①st
z ∈ ΩA(log I) t q H(z) = σ−1(ψ). ♥ ♦♥
I(−z) = σ(H(z)) = ψ.
st ♣r♥r x = −z.é♣r♦q♠♥t ♦♥ s♣♣♦s q I st ♥ s♦♠♦r♣s♠ ♦rs s H(x) = H(y),
♦rs −H(H(x)) = −H(H(y)); I(x) = I(y) t ♣r s♥t x = y.
Pr rs ♣♦r t♦t δ ∈ DerA(log I), ①st x ∈ ΩA(log I) t q
σ(δ) = I(x) = −σ(H(x)); H(−x) = δ.
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
♦♦♠♦♦ P♦ss♦♥ ♦rt♠q x, y = x
sr C[x, y]
♥t ♥r tt ♦♦♠♦♦ rér♦♥s qqs réstts
té♦rqs ♥tr♦ts ♥ st♦♥ ♦t ♦♥ tt st♦♥ A és♥r èr
C[x, y]. ♥ ♦♥sèr sr A r♦t
(f, g) 7→ f, g = x(∂f
∂x
∂g
∂y− ∂f
∂y
∂g
∂x)
q t A ♥ èr P♦ss♦♥ Pr rs ♣♦r t♦t f ∈ A, ért♦♥
Df := x(∂f
∂x
∂
∂y− ∂f
∂y
∂
∂x)
ér
Df (xA) ⊂ xA
st ♦♥ ♥ ért♦♥ ♦rt♠q ♣r♥♣ ♦♥ I = xA. ♥ ♥
ét ♦♥ q A st ♥ èr P♦ss♦♥ ♦rt♠q ♦♥ é xA.♦♠♠ t♦t strtr P♦ss♦♥ ♥t ♥ ♣♣t♦♥ A♥ér H : ΩA →DerA é♥ ♣r
H(df) = Df
♣♥♥t éqt♦♥ ♥♦s és♦♥s q H(ΩA) ⊂ Der(log xA) ♦ù
Der(log xA) st As♦s ♠♦ DerA ♦r♠é s ért♦♥s ♦rt♠qs
♦♥ I.♥ ♦♥
H(dx) = Dx = x∂
∂y, H(dy) = Dy = −x ∂
∂x
♦♥ r♠rq ss q
1
xDx(xA) =
∂
∂y(xA) = x
∂
∂y(A) ⊂ xA.
s♥st ♦♥ q1
xDx(xA) ∈ Der(log xA).
♦♥ ♦♥
H(dx
x) =
1
xH(dx) =
∂
∂yt H(dy) = H(dy) = −x ∂
∂x
♠♠ s♥t ♥♦s ♣r♠t ♦♥r q s ♦♥♥és ss♥t ♣♦r é♥r
♥tèr♠♥t H.
♠♠
ΩA(log I) ∼= Adxx
⊕Ady ∼= C[y]dx
x⊕ ΩA.
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♥t ♦♥ q ♣♦r t♦t α ∈ ΩA(log I), ①st a, b ∈ A ts q
α = adx
x+ bdy.
♥ ♦t♥t ♦♥
H(adx
x+ bdy) = −bx ∂
∂x+ a
∂
∂y∈ Der(log xA).
♥ é♥t ♥s ΩA(log I) r♦t
[α01
dx
x+ α1
1dy, α02
dx
x+ α1
2dy] :=(α01
xx, α0
2+α02
xα0
1, x+ α12α0
1, y+ α11y, α0
2)dx
x+
(α01
xx, α1
2+α02
xα1
1, x+ α11y, α1
2+ α12α1
1, y)dy .
♥ ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ r♦t é♥ ♣r ♥t ♥ strtr èr
sr ΩA(log I).
Pr ❱♦r ♥♥①
♠rq
P♦r t♦t a(y)dx
x∈ C[y]
dx
xt bdx+ cdy ∈ ΩA, ♦♥
[a(y)dx
x, bdx+ cdy] = [a(y)
dx
x, bdx] + [a(y)
dx
x, cdy]
= a(y)(∂b
∂y− b
∂a(y)
∂y)dx+ a(y)
∂c
∂ydy ∈ ΩA
♥ ♦♥t q ΩA st st ♣♦r r♦t ΩA(log I). Pr rs
[a(y)dx
x, b(y)
dx
x] = (a(y)
∂b(y)
∂y− b(y)
∂a(y)
∂y)dx
x
t
[[a(y)dx
x, b(y)
dx
x], c(y)
dx
x]+ =
[(a(y)∂b(y)
∂y− b(y)
∂a(y)
∂y)dx
x, c(y)
dx
x]+ =
(a(y)(∂b(y)
∂y− b
∂a(y)
∂y)∂c(y)
∂y− ca
∂2b(y)
∂yy+ cb
∂2a(y)
∂yy)dx
x+
= 0
♦♥ C[y]dx
xst st ♣♦r r♦t [−,−].
♥s s ♣rtr ♣♣t♦♥ ♠t♦♥♥♥ ♦rt♠q ss♦é ér
♣r♦♣rété s♥t
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
♠♠ P♦r t♦t α = α01
dx
x+α1
1dy, β = β01dx
x+β11dy ∈ ΩA(log I) t a ∈ A,
♦♥
[α, aβ] = H(α)(a)β + a[α, β]
Pr ❱♦r ♥♥①
Pr♦♣♦st♦♥ H : ΩA(log I) −→ DerA(log xA) st ♥ ♦♠♦♠♦r♣s♠
èrs
Pr ❱♦r ♥♥①
P♦r ér s ♥♦tt♦♥s ♥♦s ♦♥sér♦♥s s s♦♠♦r♣s♠s s♥ts
Lalt0(ΩA(log I), I) ∼= A, Lalt1(ΩA(log I), I) ∼= DerA(log I) ∼= A × A t
Lalt2(ΩA(log I), I) ∼= A. s r♥rs ♦♠♣① P♦ss♦♥ ♦
rt♠q ss♦é ♥t
0 // Ad0H // A×A
d1H // A // 0
ou d0H(f) = (∂yf,−x∂xf) t d1H(f1, f2) = ∂yf2 + x∂xf1.
♥ ♥
d1H(d0Hf) = x(∂2xyf − ∂2xyf) = 0.
q ♠♦♥tr q dH st rré ♥
Pr♦♣♦st♦♥ ♦r♠ P♦ss♦♥ ss♦é à x, y = x st ♦s②♠♣
tq
Pr
Pr é♥t♦♥ ♦r♠ P♦ss♦♥ −,− st µ = x∂x ∧ ∂y. ♥ ♥ ét q
♦r♠ ♦rrs♣♦♥♥t à µ st ω =dx
x∧ dy q st ♥ ♦s②♠♣tq
♦s ♦♥s à ♣rés♥t r s r♦♣s ♦♦♠♦♦ ss♦és
Pr♦♣♦st♦♥ H0PS
∼= C H1PS
∼= C H2PS
∼= 0A.
Pr ♣rès é♥t♦♥ ér♥t dH , ♦♥
H0PS .
P♦r f ∈ A. f ∈ ker d0H
s t s♠♥t s∂f
∂y=∂f
∂x= 0.
s♥st q Kerd0H
∼= C.
H2PS .
P♦r t♦t g ∈ A ♦♥ g = d1H(0,
∫gdy+ k(x)). ♦♥ d1
Hst ♥ é♣♠♦r♣s♠
t ♣r st H2PS
∼= OA.
H1PS . ♥ r♠rq q A2 ∼= (C[y]× C[x])⊕ (xA× yA).
♥s ♣♦r t♦t (f1, f2) ∈ A × A, ①st g1 ∈ C[y], g2 ∈ C[x], h2, h1 ∈ At q f1 = g1(y) + xh1 t f2 = g2(x) + yh2. s ♣♦r t♦t (a(y), b(x)) ∈
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
C[y]×C[x], x∂a(y)
∂x+∂b(x)
∂y= 0. ♦♥ C[y]×C[x] ⊂ ker d1
H. P♦r s rs♦♥s
♥♦s ♥♦s ♦♥s
ker(d1H) : = ker(d1
H) ∩ A2
= (C[y]× C[x])⊕ ker(d1H) ∩ (xA× yA)
= (C[y]× C[x])⊕Θ(A)
♦ù Θ st é♥ ♣r
A Θ // A2 a 7→ (xa,−∫x∂xa
∂xdy)
Pr rs Θ(A) ⊂ ker(d1H) t
A ∼= C[x]⊕ yC[y]⊕ xyA.
♥ ♥ ét q ♣♦r t♦t f ∈ A, ①st (f1, q, p) ∈ C[x] × C[y] × A t
q f = f1 + yq + xyp.
♥s∂f
∂y= q+y
∂q
∂y+x(p+y
∂p
∂y) = (1+y
∂
∂y)q+x(1+y
∂
∂y)p ∈ C[y]⊕x(1+y ∂
∂y)(A)
t
−x∂f∂x
= −x∂f1∂x
− xyp− x2y∂p
∂x= −x∂f1
∂x− xy(1 + x
∂
∂x)p ∈ xC[x]⊕ xy(1 +
x∂
∂x)A.
♥ ♦♥sèr Ψ : A → A2, f 7→ (x(1 + y∂
∂y)f,−xy(1 + x
∂
∂x)f)
Psq
(x(1 + y∂
∂y)f,−xy(1 + x
∂
∂x)f) = (xf
∂y
∂y+ xy
∂f
∂y,−x∂x
∂xyf − x2
∂yf
∂x)
= (∂xyf
∂y,−x∂xyf
∂x)
= d0H(xyf)
t Ψ(A) ⊂ d0H(A). ♥
(∂f
∂y,−x∂f
∂x) ∈ (C[y]× xC[x])⊕Ψ(A)
é♣r♦q♠♥t ♣♦r t♦t F := (f1(y), xf2(x)) + Ψ(p) ∈ (C[y] × xC[x]) ⊕Ψ(A), ♥
F = d0H(
∫f1dy−
∫f2dx)+d
0H(xyp) = d0
H(
∫f1dy−
∫f2dx+xyp) ∈ d0
H(A)
♦♥
d0H(A) ∼= (C[y]× xC[x])⊕Ψ(A)
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
tr ♣rt t q d0H(∫xady) = (xa,−
∫x∂xa
∂xdy) ♣♦r t♦t a ∈ A,
♦♥ ♥ ét q Θ(A) ⊂ d0H(A). ♣s ♣r ♥ rt ♥♦s ♦♥♥
Θ(A) ⊂ Ψ(A).
Psq (C[y]×C[x]) ∼= (C[y]×xC)⊕ (0A×C) t x∂A∂x
∩C = 0A, ♦♥ ♦♥
d0H(A) ∩ (0A × C) ∼= 0A.
♦ù
H1PS
∼= C.
♣rès s Pr♦♣♦st♦♥s t s ♦♦♠♦♦s P♦ss♦♥ ♠
♦rt♠qs t P♦ss♦♥ ♦rt♠qs ss♦és à strtr P♦ss♦♥
x, y = x s♦♥t s♦♠♦r♣s ♣r♦♣♦st♦♥ s♥t ♥♦s ♣r♠t érr
réstt ♥s s strtr P♦ss♦♥ ♦rt♠q ♣r♥♣ x, y = x.
Pr♦♣♦st♦♥ s r♦♣s ♦♦♠♦♦s P♦ss♦♥ x, y = x s♦♥t
H0P∼= C H1
P∼= C t H2
P∼= 0A.
Pr rs ♦♠♣① ♠ ♦rt♠q ♦♥ I st
0 // A d0 // Ω1A(log xA)
d1 // Ω2A(log xA) // 0
♦ù
d0(a) := x∂x(a)dx
x+ ∂y(a)dy
t
d1(adx
x+ bdy) := (x∂x(b)− ∂y(a))
dx
x∧ dy.
Pr♦♣♦st♦♥ r♠♠ s♥t st ♦♠♠tt
0 // A
d0 // ΩA(log xA)
−H
d1 // Ω2A(log xA)
−H
// 0
0 // Ad0H // A2
d1H // A // 0
Pr P♦r t♦t a ∈ A ♥♦s ♦♥s H(da) = H(x∂x(a)dx
x+ ∂y(a)dy) =
−∂y(a)x∂x + x∂x(a)∂y ∼= (−∂y(a), x∂x(a)) t d0H(a) ∼= (∂y(a),−x∂x(a)) = −H(da)
♣s ♣♦r t♦t α = fdx
x+gdy ∈ ΩA(log I), ♦♥ d1(α) = (x∂x(g)−∂y(f))
dx
x∧
dy, −H(d1(α)) ∼= x∂x(g)− ∂y(f).
Pr rs −H(α) = gx∂x − f∂y ∼= (g,−f) ♥♦s ♦♥s d1H(−H) = d1
H(gx∂x −
f∂y) ∼= x∂x(g)− ∂y(f)
♣r♦♣♦st♦♥ s♥t ♦♥♥ s r♦♣s ♦♦♠♦♦ ss♦és à ♦♠♣①
Pr♦♣♦st♦♥ s r♦♣s ♦♦♠♦♦ ♦♠♣① s♦♥t H0DS
∼=C H1
DS∼= C t H2
DS∼= 0A.
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
Pr
P♦r s♠♣r s ♥♦tt♦♥s ♥♦s ♣♦s♦♥s
Ω1A(log xA)
∼=→ A×Aadx
x+ bdy 7→ (a, b)
Ω2A(log xA)
∼=→ Aadx
x∧ dy 7→ a
s ♥♦tt♦♥s ♦♠♣① ♥t
0 // A d0 // A×A d1 // A // 0
♦ù d0(f) = (x∂xf, ∂yf) t d1(f1, f2) = x∂xf2 − ∂yf1.
P♦r t♦t f ∈ A, ♦♥ f = d1(−∫fdy, 0). ♦♥ A ∼= d1(A × A) t ♣r st
H2DS
∼= 0.
Pr ♥ s♠♣ ♦♥ ♦t♥t H0DS
∼= C.
♦t (f1, f2) ∈ A×A. (f1, f2) ∈ ker(d1) s t s♠♥t s f1 = x∫∂xf
2dy + k(x).
♦♥ ker(d1) ∼= (x∫∂xudy, u);u ∈ A ⊕ xC ⊕ C. r ♣♣t♦♥ s♥t st ♥
♠♦♥♦♠♦r♣s♠ ♠♦s
θ : A → xA×Au 7→ (x
∫∂xudy, u)
t ker(d1) ∼= θ(A)⊕ (xC× 0A) ∼= θ(A)⊕ (xC⊕ C).
♣s ♣♦r u ∈ A t a ∈ C[x], ♦♥
d0(∫udy+
∫adx) = (x
∫∂xudy+xa, u) = (x
∫∂xudy, u)+(xa, 0) = θ(u)+(xa, 0) ∈
θ(A)⊕ (xC). ♦♥ θ(A)⊕ (xC) ⊂ d0(A). Psq C ∩ d0(A) = 0A ♦♥ d0(A) =
d0(A)∩ (ker(d1)) ∼= θ(A)⊕ (xC). ♦♥ ker(d1) ∼= d0(A)⊕C. t ♦♥ H1DS
∼= C.
s ♦♦♠♦♦s P♦ss♦♥ t P♦ss♦♥ ♦rt♠q
(A := C[x, y], x, y = x2)).
♥s tt st♦♥ ♥♦s ♣r♦♣♦s♦♥s ♥ ①♠♣ strtr P♦ss♦♥ ♥♦♥
♦s②♠♣tq t ♥♦s ♠♦♥tr♦♥s q ss r♦♣s ♦♦♠♦♦s P♦ss♦♥ t
P♦ss♦♥ ♦rt♠q s♦♥t s♦♠♦r♣s
♥ ♦♥sèr ♥sA = C[x, y] r♦t P♦ss♦♥ x, y = x2 q st ♣r é♥t♦♥
♦rt♠q ♣r♥♣ ♦♥ é A = C[x, y] ♥♥ré ♣r x2. ♦t♦♥s
qdx2
x2= 2
dx
x. ♦♥ ΩA(log x
2A) st s♦♠♦r♣ A♠♦ ♥♥ré ♣r dxx
∪ΩA
♦♦♠♦♦ P♦ss♦♥ ♦rt♠q A = C[x, y], x, y = x2.
♣♣t♦♥ ♠t♦♥♥♥ ♦rt♠q ss♦é st é♥ sr s é♥ér
trs ΩA(log x2A) ♣r H(
dx
x) = x∂y, H(dy) = −x2∂x. ♥ ♥ ét ♦♠♣①
P♦ss♦♥ ♦rt♠q s♥t
0 // Ad0H(H) // A×A
d1H // A // 0
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
♦ù d∗H
st é♥ ♣r d0H(f) = (x∂yf,−x2∂xf), d1H(f1, f2) = x∂yf2 + x2∂xf1 − xf1
t s s♦♠♦r♣s♠s s♥ts s♦♥t s♦s♥t♥s
DerA(log x2A)
∼=→ A×Aax∂x + b∂y 7→ (a, b)
DerA(log x2A) ∧DerA(log x2A)
∼=→ Aax∂x ∧ ∂y 7→ a
H2PS (A := C[x, y], x, y = x2).
Psq A ∼= C[y] ⊕ xA ♦rs ♣♦r t♦t g ∈ A, ①st g1, g2 ∈ A t q
g = g1 + xg2. ♥s ♣♦r t♦t g ∈ A ♦♥ g ∈ d1H(A) s t s♠♥t s g = xg2 =
x∂yf2 + x2∂xf1 − xf1. s xg2 = x∂y(x∫∂xg2dy) − x2∂xg2 − xg2 t éqt♦♥
x(∂yv + x∂xu − u) = g(y) ∈ C[y]∗ ♥ ♣♦ssè ♣s s♦t♦♥ ♥s A × A. ♦♥
A ∼= d1H(A×A)⊕ C[y]. s♥st q
H2PS
∼= C[y].
H1PS .
P♦r r H1PS ♥♦s ♦♥s s♦♥ ♠♠ s♥t
♠♠ ♦t ϕ : E → F ♥ ♠♦♥♦♠♦r♣s♠ s♣s t♦rs P♦r t♦t
s♦s ♥s♠ A,B E,ϕ(A⊕B) = ϕ(A)⊕ ϕ(B)
Pr st r q ϕ(A ⊕ B) = ϕ(A) + ϕ(B). z ∈ ϕ(A) ∩ ϕ(B), ♦rs
z ∈ ϕ(A⊕B) = 0E . Pr st ϕ(A⊕B) = ϕ(A)⊕ ϕ(B).
♦t (f1, f2) ∈ A×A.(f1, f2) ∈ ker(d1
H) s t s♠♥t s ①st k ∈ C[x] t q f2 =
∫(1−x∂x)f1dy+
k(x). ♥s ker(d1H) ∼= (u,
∫(1 − x∂x)udy), uA ⊕ C[x]. P♦r t♦t u ∈ A ♦♥ ♣♦s
η(u) = (u,∫(1− x∂x)udy). ♦♥ η : A → A×A st ♥ ♠♦♥♦♠♦r♣s♠ s♣s
t♦rs ker(d1H) ∼= η(A)⊕C[x] ∼= η(C[y])⊕η(xA)⊕C[x]; ♣sq A ∼= C[y]⊕xA.
tr ♣rt ♣♦r t♦t g ∈ η(xA) ⊕ (0A, x2C[x]), ①st u ∈ A t v ∈ C[x] ts
q g = (xu,−x2∫∂xdy + x2v(x)) = d0
H(∫udy −
∫v(x)dx). ♣s ♣♦r t♦t
u(y) ∈ C[y] t a0, a1 ∈ C, éqt♦♥ ér♥t
xfy = u(y)
−x2fx =∫u(y)dy + a0 + a1x
♥ ♣♦ssè ♣s s♦t♦♥ ♥s A. ♦♥ ker(d1H) ∼= η(C[y])⊕ C1[x]⊕ d0
H(A). Pr
st
H1PS
∼= η(C[y])⊕ C1[x].
♦ù C1[x] := a0 + a1x; a0, a1 ∈ C. tr ♣rt ♣sq η st ♥ ♠♦♥♦♠♦r♣s♠
η(C[y]) ∼= C[y]. ♦rs
H1PS
∼= C[y]⊕ C1[x].
è ♣r ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ s r♦♣s ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
x, y = x2 s♦♥t
H1PS
∼= C[y]⊕ C1[x];H2PS
∼= C[y], H0PS
∼= C.
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
♦♦♠♦♦ P♦ss♦♥ A = C[x, y], x, y = x2.
t♦♥ ♣♣t♦♥ ♠t♦♥♥♥ ss♦é sr s é♥értrs ΩA st
H(dx) = x2∂y t H(dy) = −x2∂x.♣r s♦ s♠♣té ♥♦s ♦♣t♦♥s s s♦♠♦r♣s♠s s♥t
DerA∼=→ A×A
a∂x + b∂y 7→ (a, b)
DerA ∧DerA∼=→ A
a∂x ∧ ∂y 7→ a.
s s♦♠♦r♣s♠s ér♥t ♦♦♠♦♦ P♦ss♦♥ ♥t
d0H(f) = (x2∂yf,−x2∂xf) t d1H(f1, f2) = x2∂xf1 + x2∂yf2 − 2xf1.
P♦r t♦t g ∈ A, ♥♦s ♦♥s xg = −2x(−1
2g) + x2(
1
2)(−∂xg + ∂y(
∫∂xgdy)).
♦♥ A ∼= d1H(A×A)⊕ C[y].
Pr st
H2P∼= C[y].
♦t (f1, f2) ∈ A×A
(f1, f2) ∈ ker(d1H) s t s♠♥t s u ∈ A, a ∈ C[x]. stàr f1 = xu t
f2 =∫(1− x∂x)udy + a(x).
♦♥ ker(d1H) = (xu,∫(1 − x∂x)udy + a(x)), u ∈ A, a(x) ∈ C[x]. ♥ ♣♦s
ϕ(u) = (xu,∫(1 − x∂x)udy ♣♦r t♦t u ∈ A. ♦rs ϕ : A → xA × A st ♥
s♦♠♦r♣s♠ s♣s t♦rs t
ker(d1H)∼= ϕ(A)⊕ C[x]
tr ♣rt ♦♠♣t t♥ t q A ∼= C[y]⊕xA, ♦♥ ϕ(A) ∼= ϕ(C[y])⊕ϕ(xA).
Pr rs ϕ(xA)⊕ x2C[x] ⊂ d0H(A), t ♦♥ d0H(A) ∩ ϕ(C[y])⊕ C1[x] ∼= 0APr st
ker(d1H)∼= ϕ(C[y])⊕ C1[x]⊕ d0H(A) ∼= C[y]⊕ C1[x]⊕ d0H(A)
♥ ♥ ét q
H1P∼= C[y]⊕ C1[x]
è ♣r ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ s r♦♣s ♦♦♠♦♦ P♦ss♦♥ x, y = x2 s♦♥t
H1P∼= C[y]⊕ C1[x];H
2P∼= C[y], H0
P∼= C
♥ ét é♥t♦♥ s ér♥ts ♦r♠s ♦rt♠qs ♦♥ x2At xA q ΩA(log x
2A) ∼= ΩA(log xA). ♥s ♦r♠ ω =dx
x2∧ dy ss♦é à
♦r♠ P♦ss♦♥ x2∂
∂x∧ ∂
∂y x, y = x2 ♥st ♣s ♦rt♠q t♥t
♣s q1
x/∈ C[x, y]. Pr rs ♦♠♦♠♦r♣s♠ ♠♦s s♥t
µ : ΩA(log x2A) → HA(ΩA(log x
2A),A), α0dx
x+ α0dy 7→ −α1x
2 ∂
∂x+ xα0
∂
∂y
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
♥st ♣s srt
♥ t −1
xdy st ♥q ♥téé♥t x
∂
∂xq ♥st ♣♥♥t ♣s éé♠♥t
ΩA(log x2A) s ♦♥ ♦♥sèr ♥♦tr é♥t♦♥ s ér♥ts ♦r♠s ♦rt
♠qs s♥st q x, y = x2 st ♥ strtr P♦ss♦♥ ♦rt♠q
♣r♥♣ ♥♦♥ ♦s②♠♣tq ♥ ♦t♥t ♦♥ té♦rè♠ s♥t
é♦rè♠ r♦t x, y = x2 ♥t sr C[x, y] ♥ strtr P♦s
s♦♥ ♦rt♠q ♣r♥♣ ♦♥ é x2A. tt strtr P♦ss♦♥ ♥st
♣s ♦s②♠♣tq ♠s ss r♦♣s ♦♦♠♦♦ P♦ss♦♥ t P♦ss♦♥ ♦
rt♠qs s♦♥t s♦♠♦r♣s
♦♦♠♦♦ P♦ss♦♥ t P♦ss♦♥ ♦rt♠q strtr P♦ss♦♥ x, y = 0, x, z =0, y, z = xyz sr A = C[x, y, z]
♥s tt ♣rt ♥♦s ♠♦♥tr♦♥s q strtr P♦ss♦♥ ♦rt♠q
♣r♥♣A = C[x, y, z] ♥st ♣s ♦s②♠♣tq t q ss r♦♣s ♦♦♠♦♦
t ① P♦ss♦♥ t P♦ss♦♥ ♦rt♠q ss♦és s♦♥t ér♥ts Pr é♥t♦♥
tt strtr P♦ss♦♥ st ♦rt♠q ♣r♥♣ ♦♥ é xyzA t s
ér♥ts P♦ss♦♥ ♦rt♠qs s♦♥t
d0H(f) = (0, xz
∂f
∂z,−xy∂f
∂y)
d1H(f1, f2, f3) = (xz
∂f3∂z
+ xy∂f2∂y
− xf1,−xy∂f1∂y
,−xz∂f1∂z
)
d2H(f1, f2, f3) = xz
∂f2∂z
+ xy∂f3∂y
.
♠ê♠ s ér♥ts P♦ss♦♥ ss♦és s♦♥t
δ0(f) = xyz(0,∂f
∂z,−∂f
∂y)
δ1(f1, f2, f3) = (xyz∂f3∂z
+ xyz∂f2∂y
− yzf1 − xzf2 − xyf3,−xyz∂f1∂y
,−xyz∂f1∂z
)
δ2(f1, f2, f3) = xyz(∂f2∂z
+∂f3∂y
).
H3PS
♦s és♦♥s s éqt♦♥s q d2H(A3) ⊂ xA.
♣♥♥t
A ∼= C[y]⊕ zC[z]⊕ xA∼= C[y]⊕ zC[z]⊕ xC[x]⊕ xyC[y]⊕ xzC[z]⊕ x2yA⊕ x2zA⊕ xyzA.
t ♣r ♦♥tr s♥r q ♣rès é♥t♦♥ ♦r♠ ér♥t ♦rt♠q
♦♥♥é ♥s ❬t♦ ❪ −dy
xst ♥ ♥ ♦r♠ ér♥t ♦rt♠q
♣tr ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
tr ♣rt ♣♦r t♦t xg(x) ∈ xC[x] éqt♦♥ ér♥t z∂u
∂z+y
∂v
∂y= g(x) ♥
♣♦ssè ♣s s♦t♦♥ ♥s A×A×A ♣s ♣♦r t♦t g ∈ xyC[y]⊕ xzC[z]⊕x2yA⊕ x2zA⊕ xyzA, ①st
g1(y), g2(z), g3(x, y, z), g4(x, y, z), g5(x, y, z) ∈ At q g = xyg1(y) + xzg2(z) + x2yg3(x, y, z) + x2zg4(x, y, z) + xyzg5(x, y, z)
♥ ♥ ét ①♣rss♦♥ s ♦♦rs
z∂f2∂z
+ y∂f3∂y
= yg1(y)+ zg2(z)+xyg3(x, y, z)+xzg4(x, y, z)+ yzg5(x, y, z)
q st éq♥t à
z(∂f2∂z
−g2(z)−xg4(x, y, z))+y(∂f3∂y
−g1(y)−xg3(x, y, z)−zg5(x, y, z)) = 0
st ♦♥ ♣r♥r
f2 =
∫g2(z) + xg4(x, y, z)dz; f3 =
∫g1(y) + xg3(x, y, z) + zg5(x, y, z)dy
♣♦r ♦r
d2H(A3) ∼= xyC[y]⊕ xzC[z]⊕ x2yA⊕ x2zA⊕ xyzA.
♥ ♥ ét q
H3PS
∼= C[y]⊕ zC[z]⊕ xC[x].
H3P .
éqt♦♥ ♥♦s és♦♥s q
δ2(A3) ⊂ xyzA.
sA ∼= C[y]⊕ zC[z]⊕ xC[x]⊕ xyC[y]⊕ xyC[x]⊕ xzC[x]⊕
xzC[z]⊕ yzC[y]⊕ yzC[z]⊕ xyzA
tδ2(A3) ∩ C[y]⊕ zC[z]⊕ xC[x]⊕ xyC[y]⊕ xyC[x]⊕
xzC[x]⊕ xzC[z]⊕ yzC[y]⊕ yzC[z] ∼= 0A
Psq ♠♦r♣s♠
A×A → A, (u, v) 7→ ∂u
∂z+∂v
∂y
st srt δ3(A3) ∼= xyzA,♦rs
H3P∼= C[y]⊕ zC[z]⊕ xC[x]⊕ xyC[y]⊕ xyC[x]⊕xzC[x]⊕ xzC[z]⊕ yzC[y]⊕ yzC[z]
♥ ♦♥t q
①♠♣s s r♦♣s ♦♦♠♦♦s P♦ss♦♥
♦rt♠qs
é♦rè♠ tr♦sè♠ r♦♣ ♦♦♠♦♦ P♦ss♦♥ ♦rt♠q
strtr P♦ss♦♥ (A = C[x, y, z], x, y = 0, x, z = 0, y, z = xyz)
stH3P∼= C[y]⊕ zC[z]⊕ xC[x]⊕ xyC[y]⊕ xyC[x]⊕xzC[x]⊕ xzC[z]⊕ yzC[y]⊕ yzC[z]
tr♦sè♠ r♦♣ ♦♦♠♦♦ P♦ss♦♥ strtr P♦ss♦♥
(A = C[x, y, z], x, y = 0, x, z = 0, y, z = xyz) st
H3PS
∼= C[y]⊕ zC[z]⊕ xC[x]
♥ ♥ H3PS 6= H3
P .
♣tr
Préq♥tt♦♥ s strtrs
P♦ss♦♥
♦rt♠qs
♦♠♠r Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
qs ♣r♦♣rétés s strtrs ♦s②♠♣tqs
♦♥♥①♦♥ ♦rt♠q
♥trté s ♦r♠s ♦rt♠qs r♠és
Préq♥tt♦♥ s strtrs P♦ss♦♥ ♦rt♠qs
qs r♠rqs sr ♦♦♠♦♦ s rétés P♦ss♦♥
♦rt♠qs
ss r♥P♦ss♦♥ ♦rt♠q
①♠♣s ♣♣t♦♥s
Préq♥tt♦♥ (C2, π = z1∂z1 ∧ ∂z2)
Préqtt♦♥ CP1 ♠♥ strtr
♥tr♦t♦♥
♥s ♣tr ♥♦s ét♦♥s s ♦♥t♦♥s ♥térté s strtrs
♦s②♠♣tqs t ♣réq♥tt♦♥ s strtrs P♦ss♦♥ ♦rt♠qs
Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
♥s tt ♣rt A és♥ ♥ èr ♦♠♠tt ♥tr sr ♥ ♦r♣s k
rtérstq 0 t I ♥ é ♣r♦♣r A ♥♥ré ♣r S = u1, ..., up ⊂ A.
qs ♣r♦♣rétés s strtrs ♦s②♠♣tqs
♦t µ ♥ strtr èr ♥rt♦s②♠♣tq sr DerA(log I).P♦r t♦t a ∈ A ①st ♥ ♥q ért♦♥ ♣r♥♣ δa t q
i(δa)µ = da.
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
P♦s♦♥s
a, b = −µ(δa, δb)
♣♦r t♦t a, b ∈ A. ♥ ♦t♥t ♥s ♥ r♦t P♦ss♦♥ −,− sr A. ♣s
♣♦r t♦t ui ∈ S, ①st ♥ ♥q δui ∈ Derk(log I) t q
iδuiµ =
duiui.
Psq dui ∈ ΩA ⊂ ΩA(log I), ①st δui t q iδuiµ = dui.
♥ ♦♥sèr r♦t s♥t
a, bsing :=
1
uvu, v a = u, b = v ∈ S
1
uu, b a = u ∈ S, b ∈ A− S
a, b a, b ∈ A− S
Pr♦♣♦st♦♥ ♦t strtr èr ♥rt ♦s②♠♣tq µ sr
A, ♥t ♥s A ① strtrs èrs −,− t −,−sing é♥s
♦♠♠ sss s strtrs ér♥t s ♣r♦♣rétés s♥ts
i(δu,v−uvδu,vsing)µ = u, v
(du
u+dv
v
),
uv, asing = u+ v, asing; ∀a ∈ A− I, a, b = δa(b),
[δa, δb] = δa,b,
δu,v = uv[δu, δv] + u, v(δv + δu).
Pr P♦r t♦s u, v ∈ I, ♦♥
i(δu,v−uvδu,v)µ = iδu,vµ− ıuvδu,vµ
= du, v − uvd(1
uvu, v)
= u, v(du
u+dv
v
).
♦ù ♣r♦♣rété
P♦r q st ♣r♦♣rété ♥♦s r♠rq♦♥s q
i(uv[δu,δv ]+u,v(δu+δv))µ = uvi([δu,δv ])µ+ u, v(du
u+dv
v
)µ
= uvi[δu,δv ]µ+ i(δu,v−uvδu,vsing
)µ
= i(uv[δu,δv ]+δu,v−uvδu,vsing
)µ.
st ♠♦♥trr q
i(uv[δu,δv ])µ = i(uvδu,vsing
)µ.
Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
ri(uv[δu,δv ])µ = uvi([δu,δv ])µ
= uv[Lδu , iδv ]µ= uv
(Lδuiδvµ− iδvLδuµ
)
= uvd
(1
uvu, v
).
Pr rsi(uvδu,vsing
)µ = uvi(δu,vsing
)µ
= uvd (u, vsing)= uvd
(1
uvu, v
).
♦ù été ré t ♣r♦♣rété st ♥s é♠♦♥tré
♦♥♥①♦♥ ♦rt♠q
♦♥t L,L′ t L′′ tr♦s èrs ♥rt
L′′ st ♥ ①t♥s♦♥ L ♦♥ L′ s ①st ♥ st ①t ♦rt
0 // L′f // L
g // L′′ // 0
èrs ♥rt
♦t ①t♥s♦♥ t②♣ ♥t ♥ ♣♣t♦♥ ♥ér ω : L′′ → L t q
g ω = id
①t♥s♦♥ st s♥é s ω st ♥ ♦♠♦♠♦r♣s♠ èrs ♥rt
♦t ①t♥s♦♥ t②♣ ♥t ① ♣♣t♦♥s
α : L′′ −→ EndK(L′)
x 7→ αx : y 7→ [ω(x), y]
Ω :2∧L′′ −→ L′
(x; y) 7→ [ω(x), ω(y)]− ω([x, y])
ts q
[αx;αy]− α[x,y] = [ω(x, y),−]
∑
cyclerx,y,z
(αxω(x, y)− ω([x, y], z)) = 0
é♦rè♠ ❬s♠♥♥ ❪❬é♦rè♠ ❪
♦♥t L′ t L′′ ① èrs ♥rt L′ é♥♥ t s♦t : L′′ →End(L′) ♥ strtr ♠♦ ♥rt L′′ sr L′. ♦rrs♣♦♥♥
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
q à t♦t ss s♦♠♦r♣s♠ ①t♥s♦♥ t②♣ ss♦ ss Ω ∈Lalt2A(L′′, L′), st ♥ t♦♥ ♥tr ♥s♠ s sss ①t♥s♦♥s s♥és
L′ ♣r L′′ t H2(LaltA(L′′, L′)).
♦♥t L ♥ èr ♥rt t M ♥ A♠♦
❯♥ L♦♥♥①♦♥ ♥sM st ♥ ♣♣t♦♥ k♥ér ∇ : L→ End(M) t q
∇(aα)(m) = a(∇(α))(m)
∇(α)(am) = a∇(α)(m) + (ρL(α))(a)m.
s DerA(log I)♦♥♥①♦♥s sr M s♦♥t ♣♣és ♦♥♥①♦♥s ♦rt♠qs ♦♥
I sr M.
♦t L♦♥♥①♦♥ ∇ sr M ♥t ♥ ♣♣t♦♥ A♥ér
∇ :M → HomA(L,M) é♥ ♣r
∇α(m) := (∇(α))(m).
♣s ∇ ♥t sr LaltA(L,M) ♦♣értr
(d∇f)(α0, ..., αp) =i=p∑i=0
(−1)i∇αif(α0, ..., αi, ..., αp)+∑i<j
(−1)i+jf([αi, αj ], α0, ..., αi, ..., αj , ..., αp).
s♥st q ♣♦r t♦t L♦♥♥①♦♥ ∇ sr M,
(d∇f)(α0, α1) = ∇α0(f(α1))− ∇α1(f(α0))− f([α0, α1]
= (∇(α0))(f(α1))− (∇(α1)(f(α0)))− f([α0, α1]);
♣♦r t♦t α1, α2 ∈ L.
♥ ♥ ét q
(d∇∇(m))(α0, α1) = ∇α0(f(α1))− ∇α1(f(α0))− f([α0, α1]
d∇ d∇(m)(α0, α1) = (∇(α0))(f(α1))− (∇(α1)(f(α0)))− f([α0, α1])
= (∇(α0))(∇(m)(α1))− (∇(α1)(∇(m)(α0)))− ∇(m)([α0, α1])
= (∇(α0))(∇(α1)(m))− (∇(α1)(∇(α0)(m)))−∇([α0, α1])(m)
= ((∇(α0))(∇(α1))− (∇(α1)(∇(α0)))−∇([α0, α1]))(m)
= ([∇(α0),∇(α1)]−∇([α0, α1]))(m).
♥ ♥ ét ♣♣t♦♥ ♥ér ♥ts②♠étrq
ΩM L× L → End(M)
(α1, α2) 7→ [∇(α0),∇(α1)]−∇([α0, α1]
é♥t♦♥ ΩM st ♣♣é ♦rr L♦♥♥①♦♥ ∇ sr M.
♦t♦♥s Pic(A) r♦♣ s sss s♦♠♦r♣s♠s A♠♦s ♣r♦ts
r♥ 1.
Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
é♦rè♠ ❬s♠♥♥ ❪ P♦r t♦t èr ♥rt L, ♣
♣t♦♥
C : Pic(A) → H2(LaltA(L,A))
M 7→ [ΩM ]
st ♥ ♦♠♦♠♦r♣s♠ A♠♦s
P♦r L = DerA(log I) té♦rè♠ ♠♣q q ♣♣t♦♥
C : Pic(A) → H2(LaltA(DerA(log I),A))
M 7→ [ΩM ].
st ♥ ♠♦r♣s♠ A♠♦s ♥s s ΩM st ♥ ♦r♠ ♦rt♠q
♦♥ I♦♥t X ♥ rété ♦♠♣① ♠♥s♦♥ n s r♠s ♦♥t♦♥s
♦♦♠♦r♣s OX t D ♥ sr rét t r X.
♦s ♥t♦♥s t♦t ré ♥ r♦t ♦♠♣① p : L→ X s F := F(L)
OX ♠♦ ss st♦♥s
♦t F ♥ ♥ ré ♥ r♦t ♦♠♣① sr X ❯♥ ♦♥♥①♦♥ ♥s F à ♣ôs ♦
rt♠qs ♦♥ D st ♥ ♦♠♦♠♦r♣s♠ C−♥ér
: F → Ω1X(logD)⊗F
ér♥t rè ♥③ s♥t
∇(fs) = df ⊗ s+ f∇(s)
Pr♦♣♦st♦♥ ♦t ♦♥♥①♦♥ ♥s F , ♦rt♠q ♦♥ D st ♥
DerX(logD)♦♥♥①♦♥ ♥s F .
♥s st ♦rr t♦t ♦♥♥①♦♥ ♦rt♠q ∇ sr F sr ♥♦té K∇.
♦t ∇ ♥ ♦♥♥①♦♥ ♦rt♠q sr F (Ui)1≤i≤n ♥ r♦r♠♥t à s ♦
rts X. ♦t s0 ∈ H0(Ui,F) t q 0 /∈ s0(Ui). ①st σ ∈ H0(Ui,Ω1X(logD))
t q ∇s0 = σ ⊗ s0, ♦rs K∇ = dσ.
♠♠ ♦t F ♥ ré ♥ r♦t ♦♠♣① sr X t ♥ ♦♥♥①♦♥ ♦
rt♠q sr F ♦rs ♣♦r t♦t ♦r♠ r♠é τ ∈ H0(X,Ω1
X(logD)), +τ⊗id
st ♥ ♦♥♥①♦♥ ♦rt♠q sr F ♦rr K = K.
Pr ♣♣♦s♦♥s q ∇ st é♥ ♣r (s) = σ⊗ s ♣♦r t♦t st♦♥ ♥♦♥ ♥
s F
♦rs(∇+ τ ⊗ id)(s) = ∇(s) + τ ⊗ s
= σ ⊗ s+ τ ⊗ s
= (σ + τ)⊗ s
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
t(∇+ τ ⊗ id)(fs) = ∇(fs) + τ ⊗ id(fs)
= df ⊗ s+ fσ ⊗ s+ fτ ⊗ s
= df ⊗ s+ f(∇+ τ ⊗ id)s.
D st ♥ sr à r♦s♠♥ts ♥♦r♠① ♦rs ①st ♥ s②stè♠ ♦♦r♦♥♥és
(zi)1≤i≤n X ♥ t♦t ♣♦♥t p D t q
σ =r∑
i=1
aidzi
zi+
n∑
i=r+1
aidzi
♦ù ai ∈ H0(X,OX).
♠♠ ♦♥t D ♥ sr à r♦s♠♥ts ♥♦r♠① t α ∈H0(X,Ω1
X(logD)) dα = 0 ♦rs rés α st ♦♥st♥t sr t♦t
♦♠♣♦s♥t ♣rt s♥èr D. ♥ s ♦r♠s ②♥t ♠♦♥s ♥
rés ♥♦♥ ♥ ♠t r♣rés♥tt♦♥ s♥t
α =r∑
j=1
αidfjfj, α1, ..., αr ∈ C.
♠♠ ♥♦s é♠♦♥tr♦♥s ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ♦t D ♥ sr à r♦s♠♥ts ♥♦r♠① X t ♥ ♦♥
♥①♦♥ à ♣ôs ♦rt♠qs ♦♥ D F . ♦rr K∇ st ♥ s
t s♠♥t s ♦r♠ ♦♥♥①♦♥ ss♦é st ♦r♠ σ =r∑i=1aidzi
zi
ai ∈ C.
rt♦♥ ♠♦♥tr q t♦t ♦♥♥①♦♥ ∇ sr F , ♦rt♠q ♦♥ D
ér rt♦♥ s♥t
∇δ(fs)− f∇δs = δ(f)s
♣♦r t♦s s ∈ M, f ∈ OX t δ ∈ DerX(logD).
♥ s♣♣♦s q h st ♦♥t♦♥ é♥t♦♥ D t ♦♥ r♣♣ q♥ ♦♣ér
tr ér♥t ϕ ♦rr r sr F st t ♦rt♠q ♦♥ D s s 7→[ϕ(hs) − hϕ(s)]h−1 st ♥ ♦♣értr ér♥t ♦rr (r − 1) sr F . ♥ ♥♦t
+1 (logD) ♠♦ s ♦♣értrs ér♥ts ♦rr ≤ 1, ♦rt♠qs
♦♥ D sr F .P♦r t♦t ♦♥♥①♦♥ ♦rt♠q ∇ t t♦t δ ∈ DerX(logD) ♦♥ ∇δ ∈+
1 (logD).
♠♠ ♦t ϕ ♥ ♦♣értr ér♥t ♦rt♠q ♣r♠r ♦rr P♦r
t♦t f ∈ OX , ①st ♥ ♥q f ∈ OX t q [ϕ(fs)− fϕ(s)] = f s.
Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
Pr P♦r t♦t ♦♣értr ér♥t ♦rt♠q ♣r♠r ♦rr ϕ, [s 7→ϕ(fs)− fϕ(s)] ∈ +
0 (logD). ①st f ∈ OX t q [ϕ(fs)− fϕ(s)] = f s. g
st ♥ tr éé♠♥t OX t q [ϕ(fs) − fϕ(s)] = gs, ♦rs f s = gs ♣♦r t♦t
s ∈ E ♦♥ f = g.
♦r♦r ϕ st ♥ ♦♣értr ér♥t ♦rt♠q ♣r♠r ♦rr
♦♥ D ♦rs h ∈ hOX
Pr P♦r t♦s s ∈ F , ϕ(hs)− hϕ(s) = hs t ①st g ∈ OX t q ϕ(hs)−hϕ(s) = hgs Pr st (h− hg)s = 0 ♣♦r t♦t s.
s♥st q t♦t ♦♣értr ér♥t ϕ ♦rt♠q ♣r♠r ♦rr ♦♥
D, ♦♥♥ à ♥ ♣♣t♦♥ σϕ : OX → OX é♥ ♣r σϕ(f) = f t q
[ϕ(fs)− fϕ(s)] = f s ♣♦r t♦t s ∈ F .
♠♠ P♦r t♦t ϕ ∈ +1 (logD), σϕ ∈ H0(X,Der1X(logD))
Pr ♦♥t f, g ∈ OX t s ∈ F . ♥
σϕ(f.g)s = ϕ(f(gs)− fgϕ(s)
= σϕ(f)(gs) + fϕ(gs)− fgϕ(s)
= σϕ(f)(gs) + f(ϕ(gs)− gϕ(s))
= (σϕ(f)g + fσϕ(g))s
tr ♣rtσϕ(h)s = ϕ(hs)− hϕ(s)
= hmh(s)
♦♥ (σϕ(h)− hmh)s = 0 ♣♦r t♦t s.
Pr st σϕ(h) ∈ hOX σϕ ∈ H0(X,Der1X(logD)).
Pr♦♣♦st♦♥ +1 (logD) st st ♣♦r ♦♠♠ttr
Pr ♦t ϕ1, ϕ2 ① éé♠♥ts +1 (logD) ♥
ϕ1ϕ2(fs) = ϕ1
(fϕ2(s) + f2s
)
= fϕ1(fϕ2(s) + ϕ1(f2s))
= fϕ1 (ϕ2(s)) + f1ϕ2(s) + f2ϕ1(s) +¯f2
1.s
ç♦♥ ♥♦
ϕ2ϕ1(fs) = fϕ2 (ϕ1(s)) + f2ϕ1(s) + f1ϕ2(s) +¯f1
2s
♣r st
ϕ1ϕ2(fs)− ϕ2ϕ1(fs)− f (ϕ1ϕ2 − ϕ2ϕ1) (s) = ( ¯f21 − ¯f1
2)s.
Pr rs ♣♦r t♦t ϕ1, ϕ2 ∈ +1 (logD), ①st h1, h2 ∈ OX ts q
[ϕ2(hs)− hϕ2(s)]1h = h2s t [ϕ1(hs)− hϕ1(s)]
1h = h1s
h2 = hh2 t h1 = hh1.
♠ê♠ ①st h21, h12 ∈ OX ts q ¯h12= hh12 t ¯h2
1= hh21.
Pr st
ϕ1ϕ2(hs)− ϕ2ϕ1(hs)− h (ϕ1ϕ2 − ϕ2ϕ1) (s) = (¯h21 − ¯h1
2)s = h[h21 − h12]s
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
♥trté s ♦r♠s ♦rt♠qs r♠és
♦t X ♥ rété ♦♠♣① ♠♥s♦♥ 2n D ♥ sr rét X.
♠♠ D stst ♣r♦♣rété érè♠ ♦rs ♣♦r t♦t
ω ∈ Ω2X(logD), ♦♥ res(ω) ∈ ΩX .
Pr é♦ éq♥ s ♣r♦♣rétés t té♦rè♠
♥s st ♥♦s s♣♣♦s♦♥s q D stst ♣r♦♣rété té♦rè♠
és♥♦♥s ♣r HkDR−Log(X) kime r♦♣ ♦♦♠♦♦ ♠ ♦rt
♠q X. ♦s ♦♥s st ♠♦r♣s♠s r♦♣s s♥t
... // H∗(X,Z)i // H∗(X,C)
∼=
p // H∗(X,Ω∗X(logD)) // ...
H∗(X,Ω∗X)
♦t [ω] ♥ éé♠♥t H2(X,Ω∗X(logD))
é♥t♦♥ ω st t ♥tér s [ω] ♣♣rt♥t à ♠ p i. ♣r♦♣♦st♦♥ s♥t ♥♦s ♦♥♥ ♥ rtérst♦♥ s ♦r♠s ♦rt♠qs
r♠és
Pr♦♣♦st♦♥ ♦t ω ♥ st♦♥ Ω2X(logD). ♥
d(ω) = 0 s t s♠♥t s s ♦r♠ rés t s ♣rt ss s♦♥t t♦ts r♠és
Pr ♥t t q D ér s ♣r♦♣rétés é♦rè♠ t
♦♥ ω =dh
h∧ res(ω) + ωl ♦ù res(ω) st ♦r♠ rés ss♦é à ω t ωl st
♣rt ss ω.
é♦rè♠ ♦t ω ♥ ♦r♠ r♠é ♦rt♠q ♦♥
s ♣r♦♣rétés s♥ts s♦♥t éq♥ts
ω =dh
h∧ ψ + η st ♥tér
res(ω) st ①t t ①st [ω0] ∈ H2(X,C) ♥tér t q
[ω0] = [η].
Pr ω st ♥tér ♦rs ①st [ω1] ∈ H2(X,Z) t q [ω] = p i[ω1].
♦♥tr♦♥s q [ω0] = i([ω1]).
Psq ω st ♥tér ①st [ω1] ∈ H2(X,Z) t q [ω] = p i[ω1]. tr♠♥t
t ①st ♥ ♦r♠ ♦rt♠q α = α0dh
h+ α1 t q ω− ω0 = dα. ♦♥
−dα0 = ψ t η = ω0 + dα1.
é♣r♦q♠♥t s ω0 + dλ = η t ψ = dβ ω0 ♥tr ♦rs
ω = d(−β dhh) + η
= ω0 + dλ+ d(−β dhh)
= ω0 + d(λ− βdh
h)
Préq♥tt♦♥ s strtrs ♦s②♠♣tqs
Pr st [ω] = [η] = [ω0].
s tr① ♦st♥t ♥s ❬♦st♥t ❪ t ♦r ♥s ❬♦r ❪ r
♣♦s♥t sr ♣r♥♣ q♥tt♦♥ ♣r♦♣♦sé ♣r r ♥s ❬r ❪
♣r♥♣ ♣r♠t ♠♦ésr ♠té♠tq♠♥t q s ♣②s♥s ♣♣♥t
q♥tt♦♥ st sé sr ♦♥strt♦♥ ♥ s♦♠♦r♣s♠ ♥tr èr
s ♦♣értrs sr ♥ s♣ rt H t èr s ♦srs s
sqs F(X) ♦♥sttés s ♦♥t♦♥s é♥s ♥s ♥ rété s②♠♣tq (X,ω).
Ps ♣résé♠♥t s ϕ st ♥ t s♦♠♦r♣s♠ rt stsr s ♣r♦♣rétés
s♥ts
ϕ st t
s f st ♥ ♦sr ♦♥st♥t ♦rs ϕ(f) st ♠t♣t♦♥ ♣r f.
[f1, f2] = f3 ♦rs ϕ(f1)ϕ(f2) − ϕ(f2)ϕ(f1) = −ihϕ(f3) ♦ù h és♥ ♦♥
st♥t P♥
q éqt à ①st♥ ♥ r♣rés♥tt♦♥ ϕ (F(X), ω) r♥♥t ♦♠♠
tt r♠♠ èrs ♥rt s♥t
0 // F(X)m // +
1 (Γ(L))σ // DerX // 0
0 // R //
OO
(F(X), ω)
ϕ
OO
// Ham(F(X))
OO
// 0
ϕ é♥ ♣r
ϕ(as) = ∇v(a)s+ 2iπas
♦r ❬❯r♥ ❪ ♦ù ∇ st ♥ ♦♥♥①♦♥ ♥s ♥ ré ♥ r♦t ♦♠♣① L sr
X t Ham(F(X)) st èr s ♠♣s ♦♠♥t ♠t♦♥♥s
♦rsq ♦♥ r♠♣ rété s②♠♣tq (X,ω) ♣r ♥ rété ♦s②♠♣tq
(X,ω,D), ①è♠ ♥ r♠♠ st r♠♣é ♣r
0 // C // (OX , ω) // HωX(OX) // 0
♥♦s ♠♥t♥♦♥s ①♣rss♦♥ ϕ ♦♥♥é ♣r ♦rs ♣♦r t♦s f, g ∈H0(X,OX) t s ∈ E , ♦♥
ϕ(f)ϕ(g)s = ϕ(f)(ϕ(g)s)
= ϕ(f)[∇v(g)s+ 2πigs]
= ∇v(f)(∇v(g)s+ 2πigs) + 2πi(f∇v(g)s+ 2πifgs)
= ∇v(f)∇v(g)s+ 2πi∇v(f)(gs) + 2πi∇v(g)s− 4π2fgs
= ∇v(f)∇v(g)s+ 2πi(H(df).g)s+ 2πig∇v(f)s+ 2πif∇v(g)s− 4π2fg
♥ é♥♥t s rôs f t g ♦♥ ♦t♥t
ϕ(g)ϕ(f)s = ∇v(g)∇v(f)s+ 2πi(H(dg).f)s+ 2πig∇v(g)s+ 2πig∇v(f)s− 4π2gfs
♣r st
[ϕ(f), ϕ(g)]s = [∇v(f),∇v(g)]s+ 4πiω(v(f), v(g))s
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
tr ♣rt
ϕ(f, g) = ∇v(f,g)s+ 2πif, gs= ∇[v(f),v(g)]s+ 2πif, gs= [∇v(f),∇v(g)]−K∇(v(f), v(g))s+ 2πif, gs= [ϕ(f), ϕ(g)]s+ 2πif, gs−K∇(v(f), v(g))s
♥s s ♣r♦♣rété ♣r♥♣ r st stst s t s♠♥t s
K∇ = 2πiω
♥ ♥s ♣r♦é ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ ❯♥ rété ♦s②♠♣tq (X,ω,D) st ♣réq♥t s t
s♠♥t s ①st ♥ ré ♥ r♦t ♦♠♣① sr X ♣♦ssé♥t ♥ ♦♥♥①♦♥
♦rt♠q ♦♥ D ♦rr 2iπω.
Préq♥tt♦♥ s strtrs P♦ss♦♥ ♦rt
♠qs
♥s tt ♣rt (X,D,Υ) és♥r ♥ rété P♦ss♦♥ ♦rt♠q
♦♥ ♥ sr rét t r D X t♥sr P♦ss♦♥ ss♦é Υ.
qs r♠rqs sr ♦♦♠♦♦ s rétés P♦ss♦♥ ♦rt♠qs
♥ ♥♦t ∂D ér♥t P♦ss♦♥ ♦rt♠q Υ. ss ♦♦
♠♦♦ P♦ss♦♥ ♦rt♠q ♥ ♦② P sr ♥♦té [P ]D.
é♥t♦♥ ∂D t ér♥t d ♠ ♦rt♠q ♦♥
♠♠ s♥t
♠♠ ♣♣t♦♥ H ér
∂D H = −H d
♥ ♥ ét ♣r♦♣♦st♦♥ s♥t
Pr♦♣♦st♦♥ H∗DR−Log(X) st r♦♣ ♦♦♠♦♦ ♠ ♦
rt♠q X ♦rs H : (Ω∗X(logD), d) → (Der∗X(logD), ∂log) ♥t ♥ ♠♦r
♣s♠ é♥ ♣r
H : H∗DR−Log(X) → H∗
PS(X)
[α] 7→ [H(α)]D
Préq♥tt♦♥ s strtrs P♦ss♦♥ ♦rt♠qs
ss r♥P♦ss♦♥ ♦rt♠q
♦t (X,D,Υ) ♥ rété P♦ss♦♥ ♦rt♠q p : L → X ♥ ré ♥
r♦t ♦♠♣① sr X t Γ(L) s♦♥ ♠♦ st♦♥s
é♥t♦♥ ❯♥ ért♦♥ ♦rt♠q ♦♥trr♥t Dlog sr p : L → X
st ♥ ♣♣t♦♥ Dlog : C♥ér Ω1X(logD) → EndC(Γ(L)) t q
Dlogα (fs) = fDlog
α s+ (H(α)f)s
♣♦r t♦t α ∈ Ω1X(logD) t s ♥ st♦♥ ♦ Γ(L).
Dlog st t ♦♠♣t ♥ ♠étrq r♠t♥♥ h sr p : L→ X s ♣♦r t♦t
α ∈ ΩX(logD), s1, s2 ∈ Γ(L)
H(α)(h(s1, s2)) = h(Dlogα s1, s2) + h(s1, D
logα s2).
♠rq ∇ st ♥ ♦♥♥①♦♥ ♦rt♠q sr p : L → X ♦rs
Dα = ∇H(α) st ♥ ért♦♥ ♦rt♠q ♦♥trr♥t sr p : L→ X
é♥t♦♥ ♥ ♣♣ ♦rr ♥ ért♦♥ ♦rt♠q ♦♥trr♥t
Dlog sr p : L→ X t♦t ♣♣t♦♥
CD : Ω1X(logD)× Ω1
X(logD) → EndC(Γ(L))
é♥ ♣r
CD(α, β) = Dlogα Dlog
β −Dlogβ Dlog
α −Dlogα,β
♣♦r t♦s α, β ∈ Ω1X(logD).
♥ ♣r♦♣rété s♥t s ért♦♥s ♦rt♠qs ♦♥trr♥ts
Pr♦♣♦st♦♥ CD st OX♥ér ♥ts②♠étrq
Pr P♦r t♦s α, β ∈ Ω1X(logD) ♦♥
CD(β, α)s = (Dlogβ Dlog
α −Dlogα Dlog
β −Dlogβ,α)s
= −(Dlogα Dlog
β −Dlogβ Dlog
α −Dlogα,β)s
= −CD(α, β).
♦t f ♥ st♦♥ OX . ♥
CD(fα, β)s
= (Dlogfα Dlog
β −Dlogβ Dlog
fα −Dlogfα,β)s
= fDlogα Dlog
β s−Dlogβ (fDαs)−Dlog
fα,β+(H(β)f)αs
= fDlogα Dlog
β s− fDlogβ (Dαs)− (H(β)f)Dlog
α s− fDlogα,βs+ (H(β)f)Dlog
α s
= f(Dlogfα Dlog
β −Dlogβ Dlog
fα −Dlogfα,β)s
= fCD(α, β)s.
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
Pr♦♣♦st♦♥ ♦t p : L→ X ♥ ré ♥ r♦t ♦♠♣① sr (X,D,Υ) ♠♥
♥ ért♦♥ ♦rt♠q ♦♥trr♥t Dlog ♦rr CD. ♦rs
CD é♥t ♥ ss ♦♦♠♦♦ [CD]D ♥s H2
PS(X),
[CD]D ♥ é♣♥ ♣s Dlog,
♣s Dlog st ♦♠♣t ♠étrq r♠t♥♥ h sr p : L →X ♦rs CD = −CD.
Pr ♦t s ♥ st♦♥ p : L → X ♥ s♥♥♥t ♣s sr X. Psq
q r p : L → X st ♥♠♥s♦♥♥ ♦rs té ♥tr Ω1X(logD)
t Der1X(logD)) ♠♣q q ♣♣t♦♥ α 7→ Dαss st C♥ér ①st ♦♥
♥ ♥q ♠♣ trs ♦rt♠q δ sr X t q
Dlogα s = 〈α, δ〉s
♦ù 〈−,−〉 és♥ r♦t té ♥tr (Ω1X(logD) t Der1X(logD)).
♣s ♣♦r t♦s α, β ∈ ΩX(logD) ♦♥
CDlog(α, β)s = (Dlogα Dlog
β −Dlogβ Dlog
α −Dlogα,β)s
= Dlogα (〈β, δ〉s)−Dlog
β (〈α, δ〉s)− 〈α, β, δ〉s= 〈α, δ〉〈β, δ〉s+ H(〈α, δ〉)s− 〈β, δ〉〈α, δ〉s− H(〈β, δ〉)s− 〈α, β, δ〉s= H(α)(〈β, δ〉)s− H(β)(〈α, δ〉)s− 〈α, β, δ〉s= ∂Dδ(α, β)s
♦♥ CDlog = ∂Dδ. t ♣r st ∂DCDlog = ∂2Dδ = 0 ♦♥ CD st ♥ ♦②
P♦ss♦♥ ♦rt♠q
♦t D′ ♥ tr ért♦♥ ♦rt♠q ♦♥trr♥t sr p : L → X
♦rr ss♦é C ′D t δ′ ♠♣ trs ♦rt♠q ss♦é
♥ CD′ − CDlog = ∂Dδ′ − ∂Dδ CD′ = CDlog + ∂D(δ
′ − δ).
Pr rs ♣♦r t♦t α ∈ Ω1X(logD) ♦♥ D′
α −Dα ∈ EndC(Γ(L))
①st ♦♥ ♥ ♠♣ trs ♦rt♠q δ′′ t q ♣♦r t♦t s ∈ Γ(L)
(D′α −Dlog
α )s = 〈α, δ′′〉s♦♥ 〈α, δ”〉s = D′
αs−Dlogα s = 〈α, δ′〉−〈α, δ〉s 〈α, δ”〉 = 〈α, δ′−δ〉 δ′′ = δ′−δ
t ♦♥ CD′ = CDlog +∂D(δ′− δ) = CDlog +∂Dδ” stàr [CD′ ]log = [CDlog ]log.
♣♣♦s♦♥s q Dlog st ♦♠♣t ♥ ♠étrq r♠t♥♥ h sr p :
L→ X t s♦t (e) ♥ s ♦rt♦♦♥ ♦ Γ(L) ♦rs α ∈ Ω1X(logD).
♥ ♦♥
H(α)(h(e, e)) = h(Dlogα e, e) + h(e,Dlog
α e) 0 = h(〈α, δ〉e, e) + h(e, 〈α, δ〉e)
〈α, δ〉 + 〈α, δ〉 = 0 δ + δ = 0. s♥st q δ t ♦♥ CDlog = ∂Dδ s♦♥t
♠♥rs ♣rs
♣rt ♣r♦♣rété iii) té♦rè♠ s♥st q 12πi [CDlog ]D ∈ H2
PS(X)
♥ ♥ ét é♥t♦♥ s♥t
é♥t♦♥ 12πi [CDlog ]D st ♣r♠èr ss r♥P♦ss♦♥ ♦rt♠q
p : L→ X.
Préq♥tt♦♥ s strtrs P♦ss♦♥ ♦rt♠qs
♦s ♦♥s à ♣rés♥t étr ♥ ♥ ♥tr ♣r♠èr ss r♥ C1(L) ♥
ré ♥ r♦t ♦♠♣① r♠t♥ p : L → X sr ♥ rété P♦ss♦♥ ♦
rt♠q (X,D,Υ) t s ss r♥P♦ss♦♥ ♦rt♠q 12πi [CDlog ]D. ♦s
s♣♣♦s♦♥s q♥ ♣s D stst s ♣r♦♣rétés s♥ts
D st à r♦s♠♥t ♥♦r♠①
D = ∪j∈IDj é♦♠♣♦st♦♥ ♥ ♦♠♣♦s♥ts rréts D, ♦rs
q Dj st ss I és♥ ♥s♠ s ♥s
♦t ∇ ♥ ♦♥♥①♦♥ ♦rt♠q sr ♥ ré ♥ r♦t ♦♠♣① r♠t♥ L sr
X. ♦r♠ ♦♥♥①♦♥ ♦rt♠q α0 é♥ ♣r rt♦♥ ∇δs = 〈α0, δ〉sér dα0 = K.
♥ ♦♥
c1(L) = [i
2πK]D = [
i
2πdα0].
♥ ♣♦s ♣♦r t♦t α ∈ Ω1X(logD) Dα := ∇H(α).
♦t δ ♥ ♠♣ trs ♦rt♠q é♥ ♣r rt♦♥ ♥
Dαs = ∇H(α)s⇔ 〈α, δ〉s = 〈α0, H(α)〉s⇔ 〈α, δ〉s = −〈α, H(α0)〉 ⇔ δ = −H(α0).
Pr st CDlog = ∂Dδ = −∂DH(α0) = H(dα0).
♥ ♦♥ [i
2πCDlog ]D = [
i
2πH(dα0)] = H([
i
2π]dα0) = H(c1(L)).
tr♠♥t t s sss r♥P♦ss♦♥ ♦rt♠q t r♥ ré
♥ r♦t ♦♠♣① r♠t♥ L s♦♥t és ♣r rt♦♥
[i
2πCDlog ]D = H(c1(L)).
♦t p : L → X ♥ ré ♥ r♦t ♦♠♣① r♠t♥ ♠♥ ♥ ért♦♥ ♦♥
trr♥t ♦rt♠q Dlog ♦♥ ♥ sr D stss♥t s ②♣♦tèss
t sss ♣rès ♣r♥♣ r ♥s ❬r ❪ ♠♦r
♣s♠
ϕ : OX → EndC(Γ(L))
é♥ ♣r
ϕ(f)s = Dlogdf s+ 2πifs
♦t êtr ♥ r♣rés♥tt♦♥ èr (OX , −,−Υ) ♣r Γ(L). q ♠♣q q
CDlog = −2πiΥ
♥ ♥ ét q
Pr♦♣♦st♦♥ ♦♣értr ϕ st ♥ ♦♠♦♠♦r♣s♠ èrs s t
s♠♥t s CDlog = −2πiΥ
♦s ♦♣t♦♥s é♥t♦♥ s♥t
é♥t♦♥ ❯♥ rété P♦ss♦♥ ♦rt♠q (X,D,Υ) st t ♦ ♣réq♥
t s ①st ♥ ré ♥ r♦t ♦♠♣① r♠t♥ p : L → X ♣♦r q
♦♣értr ϕ é♥ ♣r st ♥ é♥ t st ♥ ♠♦r♣s♠ èrs
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
Pr♦♣♦st♦♥ ♦t (X,D,Υ) ♥ rété P♦ss♦♥ ♦rt♠q ♦♥
♥ sr D stss♥t s ②♣♦tèss t (X,D,Υ) st ♦ ♣réq♥
t s ①st ♥ ♠♣ trs ♦rt♠q δ t ♥ ♦r♠ ♦rt♠q
ω ♥tér t q
Υ+ ∂Dδ = H(ω).
Pr ♣♣♦s♦♥s (X,D,Υ) ♦ ♣réq♥t t ♥♦t♦♥s CDlog ♦rr
ért♦♥ ♦♥trr♥t Dlog ss♦é ré ♣réq♥tq L→ X ♦rrs♣♦♥♥t
♦rsi
2πCDlog = Υ ♦t K∇ ♦rr ♦♥♥①♦♥ r♠t♥♥ ∇ sr L.
♣rès ♦♥ c1(L) = [i
2πK∇]. ♥ ♣r♥ ω =
i
2πK∇ Pr rs ∇ ♥t
♥ ért♦♥ ♦rt♠q ♦♥trr♥t D é♥ ♣r Dα = ∇H(α) ♣♦r t♦t
α ∈ Ω1X(logD). ♥ ♥♦t CD s ♦rr ♣rès rt♦♥ ♦♥
H([ω]) = [i
2πCD]
r à éqt à [H(ω)] = [i
2πCD]
D. ♥ rt Pr♦♣♦st♦♥ ♦♥ ♥
ét q [CDlog ]D = [CD]D. q ♠♣q q ①st ♥ ♠♣ trs
♦rt♠q λ t qi
2πCDlog =
i
2π∂Dλ+
i
2πCD =
i
2π∂logλ+ H(ω). stàr
Υ+ ∂log(−i
2πλ) = H(ω). st ♦♥ ♣r♥r δ = − i
2πλ.
é♣r♦q♠♥t ♦♥ s♣♣♦s qs ①st♥t δ t ω ♦♠♠ ♥s s ②♣♦tèss
Pr♦♣♦st♦♥ ♦rs ♥ rt ♥térté ω ♥ ré ♥ r♦t ♦♠♣①
r♠t♥ L → X ♥ ♦♥♥①♦♥ r♠t♥♥ ♦rt♠q ∇ t ♦rr
−2πω. P♦s♦♥s Dlog(α)s = ∇H(α)s+ 2πi〈δ, α〉 t ♠♦♥tr♦♥s q st ♥ ért♦♥
♦♥trr♥t ♦rt♠q ♦♥t ♦rr CDlog Dlog ér rt♦♥
st r q st ♥ ért♦♥ ♦♥trr♥t ♦rt♠q
♦♥t α, β ∈ Ω1X(logD) t s ♥ st♦♥ L. ♥
CDlog(α, β)s = (Dlogα Dlog
β −Dlogβ Dlog
α −Dlog[α,β])s
= Dlogα (∇H(β)s+ 2πi〈β, δ〉)s−Dlog
β (∇H(α)s+ 2πi〈α, δ〉s)− ∇H[α,β]s− 2πi〈[α, β], δ〉s= ∇H(α)((∇H(β)s+ 2πi〈β, δ〉)s) + 2πi〈α, δ〉((∇H(β)s+ 2πi〈β, δ〉)s)− ∇H(β)((∇H(α)s+ 2πi〈α, δ〉)s)− 2πi〈β, δ〉((∇H(α)s+ 2πi〈α, δ〉)s)− ∇[H(α),H(β)]s− 2πi〈[α, β], δ〉s=
(∇H(α)∇H(β)s−∇H(β)∇H(α)s−∇[H(α),H(β)]s
)
+ 2πi(H(α)〈β, δ〉)s− H(β)〈α, δ〉)s− 〈[α, β], δ〉s
)
= −2πi (ω) (H(α), H(β))s+ 2πi∂Dδ (α, β) s
= −2πiΥ(α, β)s
♣♦r α, β ∈ Ω1X(logD) t ♣♦r t♦t st♦♥ ♦ s L.
P♦s♦♥s h = h1...hk é♦♠♣♦st♦♥ h ♥ ♦♠♣♦s♥ts rréts Di D
①♠♣s ♣♣t♦♥s
é♥s ♣r s hi. ♣rès Pr♦♣♦st♦♥ s ♦r♠s ♦rt♠qs ♥té
rs s♦♥t à réss ①ts t à ♦r♠ ♦♦♠♦r♣ ss♦é r♠é t ♥tér
ω st ♥tér ♦rs H(ω) =k∑i=1
Ri
hi(H(dhi)) +H(ω0) R
i st♦♥ ♦ OX
t ω0 ♥ ♦r♠ ♦♦♠♦r♣ ♥tér ♥ ♥ ét ♦r♦r s♥t
♦r♦r ♦t (X,D,Υ) ♥ rété P♦ss♦♥ ♦rt♠q ♦♥ ♥
sr D stss♥t s ②♣♦tèss é♦rè♠ (X,D,Υ) st ♦
♣réq♥t s ①st ♥ ♠♣ trs ♦rt♠q δ s ♦♥t♦♥s ♦♦
♠♦r♣s Ri, i = 1, ..., k t ♥ ♦r♠ ω0 ♦♦♠♦r♣ sr ♥ s♦s rété
♠♥s♦♥ ♥ X, ♥tér t q
Υ+ ∂D(δ −k∑
i=1
Ri
hi(H(dhi))) = H(ω0)
①♠♣s ♣♣t♦♥s
Préq♥tt♦♥ (C2, π = z1∂z1 ∧ ∂z2)
P♦s♦♥s X = C2;D = (0, z), z ∈ C ♦s s♦♥s q ω0 = dz1 ∧ dz2 st ♥
strtr s②♠♣tq sr C2 ♦♥t strtr P♦ss♦♥ ss♦é st é♥ ♣r
z1, z2 = 1 ♥ ♣♦s♥t f, gnew := f, h1g, h2 − f, h2g, h1 ♦ù h1 = z1 t
h2 = z1z2 ♦♥ ♦t♥t z1, z2new = z1 q st ♥♦tr strtr P♦ss♦♥ π.♦♥tr♦♥s
q tt strtr st ♦ ♣réq♥t P♦r ♦s ♦♥s rr ♥
st♦♥ ω0 Ω2X(logD) t q
①st ♥ st♦♥ α0 ∈ Ω2X ♥tér t α0 ∈ [ω0]
H(ω0) ∈ [z1∂z1 ∧ ∂z2 ]♦♥sér♦♥s ♦♥ ♦♠♣① ♠ ♦rt♠q s♥t
K : 0 // ΩA(log I)X d0 // Ω1X(logD)2
d1 // ΩA(log I)X // 0
♦ù d0(f) := z1∂z1fdz1z1
+ ∂z2fdz2 t d1(f1dz1z1
+ f2dz2) = (z1∂z1f2 − ∂z2f1)dz1z1
∧ dz2♦rs H2(K) = 0 ♥ t ♣♦r t♦t st♦♥ g Ω1
X(logD) ①st ♥ st♦♥
f OX t q d1(fdz2) = gdz1z1
∧ dz2. s♥st q t♦t st♦♥ Ω1
X(logD) sr s♦t♦♥ ♣r♦è♠ st
♣r♥r α0 = 0.
Préqtt♦♥ CP1 ♠♥ strtr
♥s ❬♦r♦s♥ t ❪ st é♠♦♥tré q s strtrs P♦ss♦♥
②♥♥r♥ t r♦♦♥st♥t♦r s♦♥t ♦♠♣ts
sr CP1. tr♠♥t t r ♦♠♥s♦♥ ♥ér ♥t é♠♥t ♥ strtr
♣tr Préq♥tt♦♥ s strtrs P♦ss♦♥
♦rt♠qs
P♦ss♦♥ sr CP1 ♥s ❬♦r♦s♥ t ❪ t ❬♦t♦ ❪ s trs ♠♦♥
tr♥t q tt strtr st ♣r♠étré sr C ♣r
πλ := − i
2(zz + 1)(λ+ (λ+ 2)zz))
∂
∂z∧ ∂
∂z.
t q st s♥èr ♣♦r λ ∈ [−2, 0]
♦t♦ ♠♦♥tr é♠♥t ♥s ❬♦t♦ ❪ q s r♦♣s ♦♦♠♦♦ P♦s
s♦♥ tt strtr s♦♥t
H0 ∼= H1 ∼= C; H2 ∼= C2
t s λ = 0.
P♦r λ = 0 ♦♥
π0 = −i(zz + 1)z∂
∂z∧ z ∂
∂z
♦ù
z∂z :=z
2(∂x − i∂y); t z∂z :=
z
2(∂x + i∂y).
P♦r t♦ts ♦♥t♦♥s a, b ♦♥
a, b = −i(1 + zz)zz(∂a
∂z
∂b
∂z− ∂b
∂z
∂a
∂z).
st ♥ ♦rt♠q ♦♥ sr D0 := zz = 0.P♦r t♦t ♦♥t♦♥ a, ♦♥
∂0f =∂a
∂zz,− − ∂a
∂z−, z
= i(1 + zz)(z∂a
∂zz∂
∂z− z
∂a
∂zz∂
∂z).
éqt♦♥ ♦♥ ét q H0 ∼= C.
♠ê♠ ♣♦r t♦t ♠♣ trs ♦rt♠q δ = az∂
∂z+ bz
∂
∂z♦♥
∂1δ = i(1 + zz)(z∂za− z∂zb) + izz(a+ b).
Pr rs tt strtr ♥t sr X −D0 strtr s②♠♣tq é♥ ♣r
ω0 = i1
1 + zz
dz
z∧ dz
z.
♣s ♣♦r t♦ts ♦♥t♦♥s a, b ♦♥
(1 + zz)(z∂z(a)− z∂z(b)) 6= 1.
♥ t s ①st a0, b0 ts q (1 + zz)(z∂z(a0) − z∂z(b0)) = 1 ♦rs ♣♦r t♦t
z ∈ U := z ∈ C; 0 < |z| < 4 ♦♥ r za(0)− zb(0) =1
1 + zz. q st sr
r ♥tr♥rt q1
3=
1
4 ♦rsq♦♥ ♣r♥ z = 2 ♣s z = 3.
♠♦♥tr q ω0 6= 0 ∈ H2(CP1,Ω∗(logD0))
①♠♣s ♣♣t♦♥s
♥ ♣t ♦♥ ♦♥r q ω0 st ♥ strtr ♦s②♠♣tq sr CP1. Pr ♦♥
séq♥t H : Ω∗(logD0) → Der∗X(logD) st qss♦♠♦r♣s♠
t ♦♥
H2 ∼= H−1
(C[[z, z]]
〈1 + zz〉 i1
1 + zz
dz
z∧ dz
z
).
♠rq♦♥s q
H(i1
1 + zz
dz
z∧ dz
z) = −i(1 + zz)z∂z ∧ z∂z
s♥st q π0 st ♦ ♣réq♥t s t s♠♥t s
[i1
1 + zz
dz
z] = 0 ∈ H1((CP1,Ω∗(logD0)) ∼= C[[z]]
dz
z⊕ C[[z]]
dz
z.
q st sr ♦♥ π0 ♥st ♣s ♦ ♣réq♥t
♥♥①
P♦♥ts ét qqs
é♠♦♥strt♦♥s
é♠♦♥strt♦♥ ♦r♦r
♦t −,−0 ♥ strtr P♦ss♦♥ sr A = k[x, y] ♦ A = k[x1, x2, x3]
• s A = k[x, y].
♣rès ♠♠ st ♣r♦r q
a, a00b, c0 + b, a00c, a0 + c, a00a, b0 = 0
♣♦r t♦t a, b, c ∈ A.r ♣♦r t♦t f, g ∈ A,
f, g = (∂f
∂x
∂g
∂y− ∂f
∂y
∂g
∂x)x, y
♦♥
a, a00 = (∂a
∂x
∂a0∂y
− ∂a
∂y
∂a0∂x
)x, y0, b, c0 = (∂b
∂x
∂c
∂y− ∂b
∂y
∂c
∂x)x, y0
b, a00 = (∂b
∂x
∂a0∂y
− ∂b
∂y
∂a0∂x
)x, y0, c, a0 = (∂c
∂x
∂a
∂y− ∂c
∂y
∂a
∂x)x, y0
c, a00 = (∂c
∂x
∂a0∂y
− ∂c
∂y
∂a0∂x
)x, y0, a, b0 = (∂a
∂x
∂b
∂y− ∂a
∂y
∂b
∂x)x, y0
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
♦♥ ♥ ét q
1
(x, y0)2a, a00b, c0 + b, a00c, a0 + c, a00a, b0 =
∂a
∂x
∂a0∂y
∂b
∂x
∂c
∂y− ∂a
∂x
∂a0∂y
∂b
∂y
∂c
∂x− ∂a
∂y
∂a0∂x
∂b
∂x
∂c
∂y+∂a
∂y
∂a0∂x
∂b
∂y
∂c
∂x+
∂b
∂x
∂a0∂y
∂c
∂x
∂a
∂y− ∂b
∂x
∂a0∂y
∂c
∂y
∂a
∂x− ∂b
∂y
∂a0∂x
∂c
∂x
∂a
∂y+∂b
∂y
∂a0∂x
∂c
∂y
∂a
∂x+
∂c
∂x
∂a0∂y
∂a
∂x
∂b
∂y− ∂c
∂x
∂a0∂y
∂a
∂y
∂b
∂x− ∂c
∂y
∂a0∂x
∂a
∂x
∂b
∂y+∂c
∂y
∂a0∂x
∂a
∂y
∂b
∂x=
[∂a
∂x
∂a0∂y
∂b
∂x
∂c
∂y− ∂b
∂x
∂a0∂y
∂c
∂y
∂a
∂x] + [
∂a
∂x
∂a0∂y
∂b
∂y
∂c
∂x− ∂c
∂x
∂a0∂y
∂a
∂x
∂b
∂y] +
[∂a
∂y
∂a0∂x
∂b
∂x
∂c
∂y− ∂c
∂y
∂a0∂x
∂a
∂y
∂b
∂x] + [
∂a
∂y
∂a0∂x
∂b
∂y
∂c
∂x− ∂b
∂y
∂a0∂x
∂c
∂x
∂a
∂y] +
[∂b
∂x
∂a0∂y
∂c
∂x
∂a
∂y− ∂c
∂x
∂a0∂y
∂a
∂y
∂b
∂x] + [
∂b
∂y
∂a0∂x
∂c
∂y
∂a
∂x− ∂c
∂y
∂a0∂x
∂a
∂x
∂b
∂y]
= 0
• s A = k[x1, x2, x3]. P♦s♦♥s h := a0.
♦rs ♣♦r t♦t f, g, k ∈ A, ♦♥
f, h0 = (∂f
∂x1
∂h
∂x2− ∂f
∂x2
∂h
∂x1)x1, x20 + (
∂f
∂x1
∂h
∂x3− ∂f
∂x3
∂h
∂x1)x1, x30 +
(∂f
∂x2
∂h
∂x3− ∂f
∂x3
∂h
∂x2)x2, x30
g, k0 = (∂g
∂x1
∂k
∂x2− ∂g
∂x2
∂k
∂x1)x1, x20 + (
∂g
∂x1
∂k
∂x3− ∂g
∂x3
∂k
∂x1)x1, x30 +
(∂g
∂x2
∂k
∂x3− ∂g
∂x3
∂k
∂x2)x2, x30
f, h0g, k0 = (∂f
∂x1
∂h
∂x2− ∂f
∂x2
∂h
∂x1)(∂g
∂x1
∂k
∂x2− ∂g
∂x2
∂k
∂x1)(x1, x20)2
+(∂f
∂x1
∂h
∂x3− ∂f
∂x3
∂h
∂x1)(∂g
∂x1
∂k
∂x3− ∂g
∂x3
∂k
∂x1)(x1, x30)2+
(∂f
∂x2
∂h
∂x3− ∂f
∂x3
∂h
∂x2)(∂g
∂x2
∂k
∂x3− ∂g
∂x3
∂k
∂x2)(x2, x30)2
[(∂f
∂x1
∂h
∂x2− ∂f
∂x2
∂h
∂x1)(∂g
∂x1
∂k
∂x3− ∂g
∂x3
∂k
∂x1)+(
∂f
∂x1
∂h
∂x3− ∂f
∂x3
∂h
∂x1)(∂g
∂x1
∂k
∂x2−
∂g
∂x2
∂k
∂x1)](x1, x20)(x1, x30)
[(∂f
∂x1
∂h
∂x2− ∂f
∂x2
∂h
∂x1)(∂g
∂x2
∂k
∂x3− ∂g
∂x3
∂k
∂x2)+(
∂f
∂x2
∂h
∂x3− ∂f
∂x3
∂h
∂x2)(∂g
∂x1
∂k
∂x2−
∂g
∂x2
∂k
∂x1)](x1, x20)(x2, x30)+
[(∂f
∂x1
∂h
∂x3− ∂f
∂x3
∂h
∂x1)(∂g
∂x2
∂k
∂x3− ∂g
∂x3
∂k
∂x2)+(
∂g
∂x1
∂k
∂x3− ∂g
∂x3
∂k
∂x1)(∂f
∂x2
∂h
∂x3−
∂f
∂x3
∂h
∂x2)](x1, x30x2, x30)
♥ é♦♣♣♥t tt ①♣rss♦♥ ♦♥ ♦t♥t
♦♥t (x1, x20)2 st∂f
∂x1
∂h
∂x2
∂g
∂x1
∂k
∂x2− ∂f
∂x1
∂h
∂x2
∂g
∂x2
∂k
∂x1− ∂f
∂x2
∂h
∂x1
∂g
∂x1
∂k
∂x2+
∂f
∂x2
∂h
∂x1
∂g
∂x2
∂k
∂x1
♦é♥t (x1, x30)2 st∂f
∂x1
∂h
∂x3
∂g
∂x1
∂k
∂x3− ∂f
∂x1
∂h
∂x3
∂g
∂x3
∂k
∂x1− ∂f
∂x3
∂h
∂x1
∂g
∂x1
∂k
∂x3+
∂f
∂x3
∂h
∂x1
∂g
∂x3
∂k
∂x1
♦♥t (x2, x30)2 st∂f
∂x2
∂h
∂x3
∂g
∂x2
∂k
∂x3− ∂f
∂x2
∂h
∂x3
∂g
∂x3
∂k
∂x2− ∂f
∂x3
∂h
∂x2
∂g
∂x2
∂k
∂x3+
∂f
∂x3
∂h
∂x2
∂g
∂x3
∂k
∂x2
♦♥t x1, x2x1, x3 st∂f
∂x1
∂h
∂x3
∂g
∂x1
∂k
∂x2− ∂f
∂x1
∂h
∂x3
∂g
∂x2
∂k
∂x1− ∂f
∂x3
∂h
∂x1
∂g
∂x1
∂k
∂x2+∂f
∂x3
∂h
∂x1
∂g
∂x2
∂k
∂x1+
∂f
∂x1
∂h
∂x2
∂g
∂x1
∂k
∂x3− ∂f
∂x1
∂h
∂x2
∂g
∂x3
∂k
∂x1− ∂f
∂x2
∂h
∂x1
∂g
∂x1
∂k
∂x3+
∂f
∂x2
∂h
∂x1
∂g
∂x3
∂k
∂x1
♦♥t x1, x3x2, x3 st∂f
∂x1
∂h
∂x3
∂g
∂x2
∂k
∂x3− ∂f
∂x1
∂h
∂x3
∂g
∂x3
∂k
∂x2− ∂f
∂x3
∂h
∂x1
∂g
∂x2
∂k
∂x3+∂f
∂x3
∂h
∂x1
∂g
∂x3
∂k
∂x2+
∂g
∂x1
∂k
∂x3
∂f
∂x2
∂h
∂x3− ∂g
∂x1
∂k
∂x3
∂f
∂x3
∂h
∂x2− ∂g
∂x3
∂k
∂x1
∂f
∂x2
∂h
∂x3+
∂g
∂x3
∂k
∂x1
∂f
∂x3
∂h
∂x2
t♦♥ ♣r♠tt♦♥ (fgk) sr ♦♥t x1, x3x2, x3 ♥s
♥♦s ♦♥♥
∂f
∂x1
∂h
∂x3
∂g
∂x2
∂k
∂x3− ∂f
∂x1
∂h
∂x3
∂g
∂x3
∂k
∂x2− ∂f
∂x3
∂h
∂x1
∂g
∂x2
∂k
∂x3+∂f
∂x3
∂h
∂x1
∂g
∂x3
∂k
∂x2+
∂g
∂x1
∂k
∂x3
∂f
∂x2
∂h
∂x3− ∂g
∂x1
∂k
∂x3
∂f
∂x3
∂h
∂x2− ∂g
∂x3
∂k
∂x1
∂f
∂x2
∂h
∂x3+∂g
∂x3
∂k
∂x1
∂f
∂x3
∂h
∂x2+
∂g
∂x1
∂h
∂x3
∂k
∂x2
∂f
∂x3− ∂g
∂x1
∂h
∂x3
∂k
∂x3
∂f
∂x2− ∂g
∂x3
∂h
∂x1
∂k
∂x2
∂f
∂x3+
∂g
∂x3
∂h
∂x1
∂k
∂x3
∂f
∂x2+
∂k
∂x1
∂f
∂x3
∂g
∂x2
∂h
∂x3− ∂k
∂x1
∂f
∂x3
∂g
∂x3
∂h
∂x2− ∂k
∂x3
∂f
∂x1
∂g
∂x2
∂h
∂x3+∂k
∂x3
∂f
∂x1
∂g
∂x3
∂h
∂x2+
∂k
∂x1
∂h
∂x3
∂f
∂x2
∂g
∂x3− ∂k
∂x1
∂h
∂x3
∂f
∂x3
∂g
∂x2− ∂k
∂x3
∂h
∂x1
∂f
∂x2
∂g
∂x3+∂k
∂x3
∂h
∂x1
∂f
∂x3
∂g
∂x2+
∂f
∂x1
∂g
∂x3
∂k
∂x2
∂h
∂x3− ∂f
∂x1
∂g
∂x3
∂k
∂x3
∂h
∂x2− ∂f
∂x3
∂g
∂x1
∂k
∂x2
∂h
∂x3+
∂f
∂x3
∂g
∂x1
∂k
∂x3
∂h
∂x2
♥ ér q r♥r st ♥
♠ê♠ ♦♥ ♠♦♥tr q s ♦♥ts ♥s
x1, x2x1, x3, (x2, x30)2, (x1, x30)2, (x1, x20)2
s♦♥t t♦s ♥s ♦ù réstt
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦t ♦r r♣♣♦♥s q s G : Ep → F st ♥ ♣♣t♦♥ ♥ér ♥
ts②♠étrq t q ♣♦r t♦t y ∈ E ♣♣t♦♥ ♣rt Gy : En−1 → F st
♥ ♦rs G = 0.
♦t x ∈ L, ♥♦s é♥ss♦♥s s ♣♣t♦♥s ♥érs dx : Ltq(L,P ) → Ltq(L,P )♣r
(dxf)(x1, ..., xq) = ρ(x)f(x1, ..., xq)−q∑
i=1
f(x1, ..., [xi, x], ..., xq)
t Fx : Ltq+1(L,P ) → Ltq(L,P ) é♥ ♣r
(Fx(f))(x1, ..., xq) = f(x, x1, ..., xq).
s ♣♣t♦♥s s♦♥t és ♣r s rt♦♥s
Fy(dxf) = dx(Fy(f))− F[x,y](f)
t
Fx(dρf) = dxf − dρ(Fx(f)).
rt♦♥ ♥t ♥ ♣♣t♦♥ A♥ér d : L → End(Ltq(L,P )) é♥♣r x 7→ dx.
♦♥tr♦♥s q ♣♦r t♦t q ∈ N, d st ♥ r♣rés♥tt♦♥ L Lti(L,P ) ♦s♦♥s tr ♥ ♣r ♣r ♥t♦♥ sr q.
ρ(y)ρ(x)f − ρ(x)ρ(y)f − ρ([x, y])f = 0 ♣♦r t♦t f ∈ P t x, y ∈ L. ♠♦♥tr
q d : L → End(Lt0(L,P )) st ♥ ♠♦r♣s♠ èrs ♣♣♦s♦♥s
②♣♦tès r ♣♦r t♦t 1 ≦ k ≦ q− 1 t s♦t f ∈ Ltq(L,P )). P♦r t♦t z ∈ L,
♦♥
Fz(dydxf) = dy[Fz(dxf)]− F[z,y](dxf)
= dy(dxFz(f)− F[z,x](f)
)− F[z,y](dxf)
= dydxFz(f)− dy(F[z,x](f))
= dydxFz(f)− F[z,x](dyf)− F[[z,x],y](f)− F[z,y](dxf).
♦♥
Fz(dydxf)− Fz(dxdyf) = dydxFz(f)− dxdyFz(f) + (F[[z,x],y] + F[[z,y],x])(f)
= d[x,y]Fz(f)− F[[y,x],z](f)
= (d[x,y]Fz − F[[y,x],z])(f))
= Fz(d[x,y]).
Psq z ∈ L st rtrr ♦♥ ♦♥t ♣rès ♣r♥♣ ♥t♦♥ q d st
♥ ♥ r♣rés♥tt♦♥ L ♣r Ltq(L,P )) ♣♦r t♦t q.♦♥tr♦♥s q r♠♠ s♥t st ♦♠♠tt ♣♦r t♦t q ∈ N t x ∈ L
Ltq(L,P )) dρ //
dx
Ltq+1(L,P ))
dx
Ltq(L,P ))dρ
// Ltq+1(L,P ))
f ∈ Lt0(L,P )) = P, ♦rs ♣♦r t♦t y ∈ L ♦♥
(dxdρf)(y) = ρ(x)(dρf)(y)− (dρf)([y, x])
= (ρ(x)ρ(y)− ρ[y, x])(f)
= ρ(y)ρ(x)(f) = ρ(y)(dxf) = (dρdxf)(x)
♣♣♦s♦♥s q r♠♠ st ♦♠♠tt ♣♦r t♦t 1 ≦ k ≦ q − 1 t s♦t
f ∈ Ltq+1(L,P )); q > 0. ♥ ♣♣q♥t s rt♦♥s t t q d st
♥ ♠♦r♣s♠ èrs ♦♥ ♦t♥t
Fy(dρdxf)− Fy(dxdρf)
= dydxf − dρ[Fy(dxf)]− dx[Fy(dρf)] + F[y,x](dρf)
= dydxf − dρdxFy(f)− dρ(F[y,x])− dx[Fy(dρf)] + d[y,x]f − dρ(F[y,z](f))
= dydxf − dρdx(Fy(f))− dxdyf + dxdρ(Fy(f)) + d[y,x]f
= dxdρ(Fy(f))− dρdx(Fy(f)) = 0.
s ♣r♦♣rétés ♥♦s é♠♦♥tr♦♥s ♣r♦♣♦st♦♥ ♣r ♥t♦♥ sr ♦rr
s ♥s ♣rès é ♣r Pr♦♣♦st♦♥ réstt st r
♣♦r q = 0, 1. ♣♣♦s♦♥s réstt r ♣♦r f ∈ Ltk(L,P )) 1 ≦ k ≦ q − 1
t s♦t f ∈ Ltq(L,P )), q > 0. ♣rès q ♣réè ♦♥
Fx(dρdρf) = dxdρf − dρ[Fx((dρf))] = dxdρf − dρdxf + dρdρ(Fx(f)) = 0
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦t a, b ∈ A t u, v ∈ S. s ♣r♦♣rétés Pr♦♣♦st♦♥ ♥♦s és♦♥s q
LH[a
d(u)
u]
(d(v)
v)
= aLH[d(u)
u]
(d(v)
v) + σ[H(
d(u)
u)]
(d(v)
v
)d(a)
= aLH[d(u)
u]
(d(v)
v) +
1
uσ(H d(u))(d(v)
v)d(a)
= aLH[d(u)
u]
(d(v)
v) +
1
uσ(u,−)(d(v)
v)d(a)
= ad( 1uvu, v) +
1
uvu, vd(a).
♣rès Pr♦♣♦st♦♥ ♦♥
LH[d(u)
u]
(bd(v)
v)
= [H(d(u)
u)](b)
d(u)
u+ bL
H[d(u)
u]
(d(v)
v)
=1
uu, bd(v)
v+ bd(
1
uvu, v)
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
♣rt♥t
LH(a
d(u)
u)
(bd(v)
v)
= aLH[d(u)
u]
(bd(v)
v) + σ(H(
d(u)
u)))
(bd(v)
v
)d(a)
=a
uu, bd(v)
v+
b
uvu, vd(a) + abd(
1
uvu, v)
♥ ♥trrtss♥t s rôs u t v ♥♦s ♦t♥♦♥s
LH(b
d(v)
v)
(ad(u)
u) =
b
vv, ad(u)
u+
a
uvv, ud(b) + abd(
1
uvv, u)
Psq ω0(x, y) := [Φ(x)]y ♣♦r t♦t x, y ∈ ΩA(log I)ω(a
d(u)
u, bd(v)
v) =
ab
uvu, v
♦rs
dω(ad(u)
u, bd(v)
v) = d[
ab
uvu, v] = abd[
1
uvu, v] + d(ab).(
1
uvu, v)
= abd[1
uvu, v] + bd(a).(
1
uvu, v) + ad(b).(
1
uvu, v)
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦♥t a ∈ A t u, v, w ∈ S. ♣rès ♦r♦r ♦♥ [du
u,dv
v]ω =
d(1
uvu, v) t [da, du
u]ω = d(
1
ua, u).
t♥t ♦♥♥é q strtr P♦ss♦♥ −,− st ♦rt♠q ♣r♥♣ ♦♥
I, ♦♥ 1
uvu, v ∈ A. ♥ ♦♥
[[du
u,dv
v
]
ω
,dw
w
]
ω
=
[d(
1
uvu, v), dw
w
]
ω
= d(1
w 1
uvu, v, w).
[[dv
v,dw
w
]
ω
,du
u
]
ω
=
[d(
1
vwv, w), du
u
]
ω[[dw
w,du
u
]
ω
,dv
v
]
ω
=
[d(
1
uww, u), dv
v
]
ω
.
r ♥ ♣♣q♥t ♠♠ ♦♥ ♦t♥t
1
w 1
uvu, v, w =
1
w(1
uvu, v, w − 1
u2v2u, vuv,w)
=1
uvwu, v, w − 1
wu2vu, vu,w − 1
wuv2u, vv, w
1
u 1
vwv, w, u =
1
u(1
vwv, w, u − 1
v2w2v, wvw, u)
=1
vwuv, w, u − 1
uv2wv, wv, u − 1
uvw2v, ww, u
1
v 1
wuw, u, v =
1
v(1
vuw, u, v − 1
w2u2w, uwu, v)
=1
wuvw, u, v − 1
vvw2uw, uw, v − 1
vwu2w, uu, v.
♥ ♦t♥t ♦♥[[du
u,dv
v
]
ω
,dw
w
]
ω
+
[[dv
v,dw
w
]
ω
,du
u
]
ω
+
[[dw
w,du
u
]
ω
,dv
v
]
ω
=1
uvwu, v, w − 1
wu2vu, vu,w − 1
wuv2u, vv, w
+1
vwuv, w, u − 1
uv2wv, wv, u − 1
uvw2v, ww, u
+1
wuvw, u, v − 1
vvw2uw, uw, v − 1
vwu2w, uu, v
=1
uvw(v, w, u+ w, u, v+ u, v, w)
= 0
r♥èr été é♦ ♥tté ♦ −,−.
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
P♦r q st ♣r♠èr ssrt♦♥ ét♥t ♦♥♥és u, v ∈ S t w ∈ A ♥♦s
♦♥s ♥tté s♥t [[du
u,dv
v
], dw
]=
[d(
1
uvu, v), dw
]= d
( 1
uvu, v, w
).
r
1
uvu, v, w
=
1
uvu, v, w − 1
uv2u, vv, w − 1
vu2u, vu,w
♣r ♦♥séq♥t[[du
u,dv
v
], dw
]= d
(1
uvu, v, w − 1
uv2u, vv, w − 1
vu2u, vu,w
).
tts ♠t♥s ♦♥ [[dv
v, dw
],du
u
]=
[d
(1
vv, w
),du
u
]= d
(1
u
1
vv, w, u
).
Psq1
u
1
vv, w, u
=
1
u
(1
vv, w, u − 1
v2v, wv, u
)=
1
uvv, w, u−
1
uv2v, wv, u
♦♥
[[dv
v, dw
],du
u
]= d
(1
uvv, w, u − 1
uv2v, wv, u
)
t ♦♥[[dw,
du
u
],dv
v
]=
[(1
uw, u
),dv
v
]= d
(1
v
1
uw, u, v
).
Pr rs1
v
1
uw, u, v
=
1
vuw, u, v − 1
vu2w, uu, v.
♦♥
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
[[dw,
du
u
],dv
v
]= d
(1
vuw, u, v − 1
vu2w, uu, v
).
♥tté ♦ −,− ♦♥t ① s sss ♦♥♥ [[du
u,dv
v
], dw
]+
[[dv
v, dw
],du
u
]+
[[dw,
du
u
],dv
v
]= 0.
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦♥t a1, a2, a3, u1, u2 t u3 é♥s ♣r s ②♣♦tèss Pr♦♣♦st♦♥
P ♣rès ♠♠ ♥♦s ♦♥s 1
u3 1
u1u2u1, u2, u3+
1
u1 1
u2u3u2, u3, u1+
1
u2 1
u3u1u3, u1, u2
=1
u1u2u3u1, u2, u3 −
1
u3u1u22u1, u2u2, u3 −
1
u3u21u2u1, u2u1, u3+
+1
u1u2u3u2, u3, u1 −
1
u3u1u22u2, u3u2, u1 −
1
u23u1u2u2, u3u3, u1+
1
u1u2u3u3, u1, u2 −
1
u3u21u2u3, u1u1, u2 −
1
u23u1u2u3, u1u3, u2
=1
u1u2u3(u1, u2, u3+ u2, u3, u1+ u3, u1, u2)+
−u2, u3u3u1u22
(u1, u2+ u2, u1)−u1, u2u3u21u2
(u1, u3+ u3, u1)+
−u3, u1u23u1u2
(u2, u3+ u3, u2)♣♥♥t r♦t −,− ét♥t ♥ts②♠étrq ui, uj + uj , ui = 0
♣♦r t♦t (i, j).
♥ tr♠♥ ♣r P ♥ ts♥t ♥tté ♦ −,−.
P ♥ ♣♣q♥t ♠♠ ♦♥ ♦t♥t a1u1
a2u2
u2, a3, u1du3u3
=
(a1u1u2
a2u2, a3, u1 −a1a2u1u22
u2, a3u2, u1)du3u3
=
(a1a2u1u2
u2, a3, u1+a1u1u2
u2, a3a2, u1 −a1a2u1u22
u2, a3u2, u1)du3u3
.
Pr ♥ rs♦♥♥♠♥t ♥♦ ♦♥ é♠♦♥tr s trs ♣r♦♣rétés
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♣rès Pr♦♣♦st♦♥ ♦♥
[[a1du1u1
, a2du2u2
], a3
du3u3
]+
[[a2du2u2
, a3du3u3
], a1
du1u1
]+
[[a3du3u3
, a1du1u1
], a2
du2u2
]=
a1u1u2
u1, a2u2, a3du3u3
+a3a1u3u1
u1, a2, u3du2u2
+a3u3u1
u1, a2a1, u3du2u2
+
−a3a1u21u3
u1, a2u1, u3du2u2
+a1a3u1
u1, a2d(1
u2u3u2, u3) +
a2u2u1
a1, u2u1, a3du3u3
+
+a3a2u3u2
a1, u2, u3du1u1
+a3u3u2
a1, u2a2, u3du1u1
− a3a2u3u22
a1, u2u2, u3du1u1
+
a2a3u2
a1, u2d(1
u1u3u1, u3) +
a1a2u1u2
u1, u2, a3du3u3
− a1a2u1u22
u1, u2u2, a3du3u3
+
−a1a2u21u2
u1, u2u1, a3du3u3
+a3a1u3
a2, u3d(1
u1u2u1, u2) +
a3a2u3
a1, u3d(1
u1u2u1, u2)
+a1a2a3d(1
u3 1
u1u2u1, u2, u3)
a2u2u3
u2, a3u3, a1du1u1
+a1a2u1u2
u2, a3, u1du3u3
+a1u1u2
u2, a3a2, u1du3u3
+
−a1a2u22u1
u2, a3u2, u1du3u3
+a2a1u2
u2, a3d(1
u3u1u3, u1) +
a3u3u2
a2, u3u2, a1du1u1
+
+a1a3u1u3
a2, u3, u1du2u2
+a1u1u3
a2, u3a3, u1du2u2
− a1a3u1u23
a2, u3u3, u1du2u2
+
a3a1u3
a2, u3d(1
u2u1u2, u1) +
a2a3u2u3
u2, u3, a1du1u1
− a2a3u2u23
u2, u3u3, a1du1u1
+
−a2a3u22u3
u2, u3u2, a1du1u1
+a1a2u1
a3, u1d(1
u2u3u2, u3) +
a1a3u1
a2, u1d(1
u2u3u2, u3)
+a2a3a1d(1
u1 1
u2u3u2, u3, u1)
a3u3u1
u3, a1u1, a2du2u2
+a2a3u2u3
u3, a1, u2du1u1
+a2u2u3
u3, a1a3, u2du1u1
+
−a2a3u23u2
u3, a1u3, u2du1u1
+a3a2u3
u3, a1d(1
u1u2u1, u2) +
a1u1u3
a3, u1u3, a2du2u2
+
+a2a1u2u1
a3, u1, u2du3u3
+a2u2u1
a3, u1a1, u2du3u3
− a2a1u2u21
a3, u1u1, u2du3u3
+
a1a2u1
a3, u1d(1
u3u2u3, u2) +
a3a1u3u1
u3, u1, a2du2u2
− a3a1u3u21
u3, u1u1, a2du2u2
+
−a3a1u23u1
u3, u1u3, a2du2u2
+a2a3u2
a1, u2d(1
u3u1u3, u1) +
a2a1u2
a3, u2d(1
u3u1u3, u1)
+a3a1a2d(1
u2 1
u3u1u3, u1, u2).
♥ rt s s ♥térrs été sss st éq♥t à
[[a1du1u1
, a2du2u2
], a3
du3u3
]+
[[a2du2u2
, a3du3u3
], a1
du1u1
]+
[[a3du3u3
, a1du1u1
], a2
du2u2
]=
a1u1u2
u2, a3 (u1, a2+ u2, a1)du3u3
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
a3a1u3u1
(u1, a2, u3+ a2, u3, u1+ u3, u1, a2)du2u2
+u1, a2a3u3u1
(a1, u3+ u3, a1)du2u2
+−u1, a2a3a1u21u3
(u1, u3+ u3, u1)du2u2
+
a1a3u1
(u1, a2+ a2, u1) d(1
u2u3u2, u3) + a1, u2
a2u2u1
(u1, a3+ a3, u1)du3u3
+a3a2u3u2
(a1, u2, u3+ u2, u3, a1+ u3, a1, u2)du1u1
+a2, u3a3u3u2
(a1, u2+ u2, a1+)du1u1
− u2, u3a3a2u3u22
(a1, u2+ u2, a1)du1u1
+
a2a3u2
a1, u2d(
1
u1u3u1, u3+
1
u3u1u3, u1
)
+a1a2u1u2
(u1, u2, a3+ u2, a3, u1+ a3, u1, u2)du3u3
+
−u2, a3a1a2u1u22
(u1, u2+ u2, u1)du3u3
− u1, u2a1a2u21u2
(u1, a3+ a3, u1)du3u3
+a3a1u3
a2, u3d(1
u1u2(u1, u2+ u2, u1))) +
a3a2u3
d(1
u1u2u1, u2 (a1, u3+ u3, a1))+
u3, a1a2u2u3
(u2, a3+ a3, u2)du1u1
+a2a1u2
(u2, a3+ a3, u2) d(1
u3u1u3, u1)+
a3, u1a1u1u3
(a2, u3+ u3, a2)du2u2
− u3, u1a1a3u1u23
(a2, u3+ u3, a2)du2u2
−u3, a1a2a3u2u23
(u2, u3+ u3, u2)du1u1
+a1a2u1
a3, u1d(1
u2u3(u2, u3) + u3, u2))
+a1a2a3d
(1
u3 1
u1u2u1, u2, u3+
1
u1 1
u2u3u2, u3, u1+
1
u2 1
u3u1u3, u1, u2
)= 0.
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
é♦ s ♣r♦♣rétés s strtrs P♦ss♦♥ ♦rt♠qs ♣r♥♣s
étés à Pr♦♣♦st♦♥ q ♦♥ s étés q s♥t
[[a1
du1u1
, a2du2u2
]ω, b3dv3
]
ω
=a1u1u2
u1, a2u2, b3dv3 +b3a1u1
u1, a2, v3du2u2
+
b3u1
u1, a2a1, v3du2u2
− b3a1u21
u1, a2u1, v3du2u2
+a1b3u1
u1, a2d(1
u2u2, v3)+
a2u2u1
a1, u2u1, b3dv3 +b3a2u2
a1, u2, v3du1u1
+b3u2
a1, u2a2, , v3du1u1
+
−b3a2u22
a1, u2u2, v3du1u1
+a2b3u2
a1, u2d(1
u1u1, v3) +
a2a1u1u2
u1, u2, b3dv3+
−a1a2u21u2
u1, u2u1, b3dv3 −a1a2u1u22
u1, u2u2, b3dv3 + b3a1a2, v3d(1
u1u2u1, u2)
+b3a2a1, v3d(1
u1u2u1, u2) + a1a2b3d(
1
u1u2u1, u2, v3).
[[a2
du2u2
, b3dv3]ω, a1du1u1
]
ω
=a2u2
u2, b3v3, a1du1u1
+a1a2u1u2
u2, b3, u1dv3
+a1u1u2
u2, b3a2, u1dv3 −a1a2u1u22
u2, b3u2, u1dv3 +a1a2u2
u2, b3d(1
u1v3, u1)
+b3u2
a2, v3u2, a1du1u1
+a1b3u1
a2, v3, u1du2u2
+a1u1
a2, v3b3, u2du2u2
+a1b3a2, v3d(1
u1u2u2, u1) +
a2b3u2
u2, v3, a1du1u1
− a2b3u22
u2, a1u2, v3du1u1
+a1a2u1
b3, u1d(1
u2u2, v3) +
a1b3u1
a2, u1d(1
u2u2, v3)+
a2b3a1d(1
u1 1
u2u2, v3, u1)
t[[b3dv3, a1
du1u1
]ω, a2du2u2
]
ω
=b3u1
v3, a1u1, a2du2u2
+a2b3u2
v3, a1, u2du1u1
+a2u2
v3, a1b3, u2du1u1
+ b3a2v3, a1d(1
u1u2u1, u2) +
a1u1
b3, u1v3, a2du2u2
+a2a1u1u2
b3, u1, u2dv3 +a2u1u2
b3, u1a1, u2dv3 −a2a1u21u2
b3, u1u1, u2dv3+a1a2u1
b3, u1d(1
u2v3, u2) +
b3a1u1
v3, u1, a2du2u2
− b3a1u21
v3, u3u1, a2du2u2
+a1a2u2
b3, u2d(1
u1v3, u1) +
a2b3u2
a1, u2d(1
u1v3, u1)+
a1b3a2d(1
u2 1
u1v3, u1, u2).
r ♠♠r r♦t r♥èr été ♣t sérr s♦s ♦r♠
u2, b3a1u1u2
(u1, a2+ a2, u1) dv3 +b3u1
u1, a2 (a1, v3+ v3, a1)du2u2
+
b3a1u1
(u1, a2, v3+ v3, u1, a2+ a2, v3, u1+)du2u2
+
−u1, a2b3a1u21
(u1, v3+ v3, u1)du2u2
+a1b3u1
(u1, a2+ a2, u1) d(1
u2u2, v3)+
a2u2u1
a1, u2(u1, b3+ b3, u1)dv3 + a2, v3b3u2
(a1, u2+ u2, a1)du1u1
+
b3a2u2
(a1, u2, v3+ u2, v3, a1+ v3, a1, u2)du1u1
+
−u2, v3b3a2u22
(a1, u2+ u2, a1)du1u1
+a2b3u2
a1, u2d(1
u1(u1, v3+ v3, u1))+
a2a1u1u2
(u1, u2, b3+ u2, b3, u1+ b3, u1, u2)dv3+
−u1, u2a1a2u21u2
(u1, b3+ b3, u1)dv3 − u2, b3a1a2u1u22
(u1, u2+ u2, u1dv3)dv3
+b3a1a2, v3d(1
u1u2(u2, u1+ u1, u2)) + b3a2(a1, v3+ v3, a1)d(
1
u1u2u1, u2)
+a1a2b3d(1
u1u2u1, u2, v3+
1
u1 1
u2u2, v3, u1+
1
u2 1
u1v3, u1, u2)+
v3, a1a2u2
(u2, b3+ b3, u2)du1u1
+a1a2u2
(u2, b3+ b3, u2)d(1
u1v3, u1)
+b3, u2a1u1
(a2, v3+ v3, a2)du2u2
++b3, u1a1a2u1
d(1
u2(u2, v3+ v3, u2)).
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
è é♠♦♥strt♦♥
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦♥t u1, u3 ∈ S a1, a3, b2 t v2 ♥s A ♣rès r♠rq ♦s ♦♥s [[a1
du1u1
, b2dv2]ω, a3du3u3
]
ω
+
[[b2dv2, a3
du3u3
]ω, a1du1u1
]
ω
+
[[a3
du3u3
, a1du1u1
]ω, b2dv2
]
ω
=
a1u1
u1, b2v2, a3du3u3
+a3a1u3u1
u1, b2, u3dv3 +a3u3u1
a1, u3u1, b2dv3+
−a3a1u3u21
u1, b2u1, u3dv2 +a1a3u1
u1, b2d(1
u3v2, u3) +
b2u1
a1, v2u1, a3du3u3
+
a3b2u3
a1, v2, u3du1u1
+a3u3
b2, u3a1, v2du1u1
+ a3b2a1, v2d(1
u1u3u1, u3)
+a1b2u1
u1, v2, a3du3u3
− a1b2u21
u1, a3u1, v2du3u3
+a3a1u3
b2, u3d(1
u1u1, v2)
+a3b2u3
a1, u3d(1
u1u1, v2) + a1b2a3d(
1
u3 1
u1u1, v2, u3)
+b2u3
v2, a3u3, a1du1u1
+a1b2u1
v2, a3, u1du3u3
+a1u1
v2, a3b2, u1du3u3
+ b2a1v2, a3d(1
u3u1u3, u1) +
a3u3
b2, u3v2, a1du1u1
+a1a3u3u1
b2, u3, u1dv2 +a1u3u1
b2, u3a3, u1dv2 −a1a3u23u1
b2, u3u3, u1dv2+a3a1u3
b3, u3d(1
u1v2, u1) +
b2a3u3
v2, u3, a1du1u1
− b2a3u23
v2, u3u3, a1du1u1
+a3a1u1
b2, u1d(1
u3v2, u3) +
a1b2u1
a3, u1d(1
u3v2, u3)+
a3b3a1d(1
u1 1
u3v2, u3, u1)
+a3u3u1
u3, a1u1, b2dv2 +b2a3u3
u3, a1, v2du1u1
+
b2u3
u3, a1a3, v2du1u1
− b2a3u23
u3, a1u3, v2du1u1
+a3b2u3
u3, a1d(1
u1u1, v2)+
a1u1u3
a3, u1u3, b2dv2 +b2a1u1
a3, u1, v2du3u3
+b2u1
a3, u1a1, v2du3u3
+
−b2a1u21
a3, u1u1, v2du3u3
+a1b2u1
a3, u1d(1
u3u3, v2) +
a1a3u3u1
u3, u1, b2dv2+
−a3a1u23u1
u3, u1u3, b2dv2 −a3a1u3u21
u3, u1u1, b2dv2 + b2a3a1, v2d(1
u3u1u3, u1)
+b2a1a3, v2d(1
u3u1u3, u1) + a3a1b2d(
1
u3u1u3, u1, v2).
♥ ♥s
[[a1
du1u1
, b2dv2]ω, a3du3u3
]
ω
+
[[b2dv2, a3
du3u3
]ω, a1du1u1
]
ω
+
[[a3
du3u3
, a1du1u1
]ω, b2dv2
]
ω
= v2, a3a1u1
(u1, b2+ b2, u1)du3u3
+ u1, b2a3u3u1
(a1, u3+ u3, a1)dv2a3a1u3u1
(u1, b2, u3+ b2, u3, u1+ u3, u1, b2)dv2+
−u1, b2a3a1u3u21
(u1, u3+ u3, u1)dv2 +a1a3u1
(u1, b2+ b2, u1)d(1
u3v2, u3)+
a3b2u3
(a1, v2, u3+ u3, a1, v2+ v2, u3, a1)du1u1
+
+b2, u3a3u3
(a1, v2+ v2, a1)du1u1
+ a3b2a1, v2d(1
u1u3(u1, u3+ u3, u1)
+(a1b2u1
u1, v2, a3+ v2, a3, u1+ a3, u1, v2)du3u3
−u1, v2a1b2u21
(u1, a3+ a3, u1)du3u3
+a3a1u3
b2, u3d(1
u1(u1, v2+ v2, u1))+
a3b2u3
(a1, u3+ u3, a1)d(1
u1u1, v2) +
b2u3
v2, a3(u3, a1+ a1, u3)du1u1
+b2a1(v2, a3+ a3, v2)d(1
u3u1u3, u1) + a3, u1
a1u3u1
(b2, u3+ u3, b2dv2
−a1a3u23u1
b2, u3(u3, u1+ u1, u3)dv2 −b2a3u23
u3, a1(v2, u3+ v2, u3)du1u1
.
é♠♦♥strt♦♥ é♦rè♠
♦t αi =dh
h+ α1
i , ♦♥ (LH(α1)
α2|H(α3))
=
(1
hLH(dh)α
12|1
hH(dh)
)−
(H(dh)(α1
2)
h
dh
h| 1hH(dh)
)+
(1
hLH(dh)α
12|H(α1
3)
)−
(H(dh)(α1
2)
h
dh
h|H(α1
3)
)−
(H(α1
1)h
h
dh
h| 1hH(dh)
)−
(H((α1
1)
h
dh
h|H(α1
3)
)+
(1
hLH(α1
1)dh|
1
hH(dh)
)+
(1
hLH(α1
1)dh|H(α1
3)
)+
(LH(α1
1)α
12|1
hH(dh)
)+(LH(α1
1)α
12|H(α1
3))
ér♦♥s r♥èr été s♦s ♦r♠ s♥t
(LH(α1)
α2|H(α3))
=1
h2(LH(dh)α
12|H(dh)
)+
1
h
(LH(dh)α
12|H(α1
3))
−H(dh)(α1
2)
h2(dh|H(α1
3))
− H(α11)h
h2(dh|H(α1
3))
+1
h2
(LH(α1
1)dh|H(dh)
)+
1
h
(LH(α1
1)dh|H(α1
3))+
1
h
(LH(α1
1)α
12|H(dh)
)+(LH(α1
1)α
12|H(α1
3)).
♥ s♦♠♠♥t s♦s ♣r♠tt♦♥ ②q ♦♥ ♦t♥t (LH(α1)
α2|H(α3))+ =
1
h2(LH(dh)α
12|H(dh)
)+
1
h
(LH(dh)α
12|H(α1
3))
−H(dh)α1
2
h2(dh|H(α1
3))
− H(α11)(h)
h2(dh|H(α1
3))
+1
h2
(LH(α1
1)dh|H(dh)
)+
1
h
(LH(α1
1)dh|H(α1
3))
+1
h
(LH(α1
1)α
12|H(dh)
)+
(LH(α1
1)α
12|H(α1
3))
+
1
h2(LH(dh)α
13|H(dh)
)+
1
h
(LH(dh)α
13|H(α1
1))
− H(dh)(α13)
h2(dh|H(α1
1))
−
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
H(α12)h
h2(dh|H(α1
1))
+1
h2
(LH(α1
2)dh|H(dh)
)+
1
h
(LH(α1
2)dh|H(α1
1))
+
1
h
(LH(α1
2)α
13|H(dh)
)+(LH(α1
2)α
13|H(α1
1))+
1
h2(LH(dh)α
11|H(dh)
)+1
h
(LH(dh)α
11|H(α1
2))−
H(dh)(α11)
h2(dh|H(α1
2))
− H(α13)h
h2(dh|H(α1
2))
+1
h2
(LH(α1
3)dh|H(dh)
)+
1
h
(LH(α1
3)dh|H(α1
2))+
1
h
(LH(α1
3)α
11|H(dh)
)+(LH(α1
3)α
11|H(α1
2))
♥ ♦t♥t (LH(α1)
α2|H(α3))+ =
[(LH(α1
3)α
11|H(α1
2))+(LH(α1
1)α
12|H(α1
3))+(LH(α1
2)α
13|H(α1
1))]
1
h
[(LH(α1
3)α
11|H(dh)
)+(LH(α1
1)dh|H(α1
3))+(LH(dh)α
13|H(α1
1))]
+
1
h
[(LH(α1
3)dh|H(α1
2))+(LH(dh)α
12|H(α1
3))+(LH(α1
2)α
13|H(dh)
)]+
1
h2
[(LH(α1
3)dh|H(dh)
)+(LH(dh)dh|H(α1
3))+(LH(dh)|α1
3H(dh))]
+
1
h2
[(LH(α1
3)dh|H(dh)
)+(LH(dh)dh|H(α1
3))+(LH(dh)α
13|H(dh)
)]+
1
h
[(LH(dh)α
11|H(α1
2))+(LH(α1
1)α
12|H(dh)
)+(LH(α1
2)dh|H(α1
1))]
+
− 1
h2[H(α1
1)(dh)(dh|H(α1
2))+H(α1
3)(dh)(dh|H(α1
2))]
+
− 1
h2[H(α1
3)(dh)(dh|H(α1
1))+H(α1
2)(dh)(dh|H(α1
1))]
+
− 1
h2[H(dh)(α1
2)(dh|H(α1
3))+H(dh)(α1
1)(dh|H(α1
3))]
Psq H st ♠t♦♥♥ s rt♦♥s s♦♥t ♥s ♥ ♦♥
(LH(α1)
α2|H(α3))+ =
−H(dh)(α11)
h2(dh|H(α1
2))− H(dh)(α1
3)
h2(dh|H(α1
2))
−H(dh)(α13)
h2(dh|H(α1
1))− H(dh)(α1
2)
h2(dh|H(α1
1))
−H(dh)(α12)
h2(dh|H(α1
3))− H(dh)(α1
1)
h2(dh|H(α1
3))
= −[H(α1
1)(dh)
h2(dh|H(α1
2))+H(dh)(α1
2)
h2(dh|H(α1
1))]
−[H(α1
3)(dh)
h2(dh|H(α1
2))+H(dh)(α1
2)
h2(dh|H(α1
3))]
−[H(α1
3)(dh)
h2(dh|H(α1
1))+H(dh)(α1
1)
h2(dh|H(α1
3))]
= 0.
♥ rt t qq s♦t αi = α0i
dh
h+ α1
i ∈ ΩX(logD) qq s♦t i ∈1, 2, 3 ♦♥
Lα01
hH(dh)+H(α1
1)
(α02
dh
h+ α1
2) = α01
H(dh)
h.(α0
2)dh
h
+α01
hLH(dh)α
12 +H(dh).α1
2
dα01
h− α0
1
H(dh)
h.α1
2
dh
h
+H(α11).(α
02)dh
h− α0
2
H(α11)
h.dh
dh
h+α02
hLH(α1
1)dh+ LH(α1
1)α
12
s♥ st q
(LH(α1)
α2|H(α3))=
(α01
hH(dh)(α0
2)dh
h|α
03
hH(dh)
)+
(α01
hH(dh)(α0
2)dh
h|H(α1
3)
)+
(α01
hLH(dh)α
12|α03
hH(dh)
)+
(α01
hLH(dh)α
12|H(α1
3)
)+
(H(dh).α1
2
dα01
h|α
03H(dh)
h
)+
(H(dh).α1
2
dα01
h|H(α1
3)
)+
(α01
H(dh).α12
h
dh
h|α0
3
H(dh)
h
)+
(α01
H(dh).α12
h
dh
h|H(α1
3)
)+
(H(α1
1)(α02)dh
h|α
03
hH(dh)
)+
(H(α1
1)(α02)dh
h|H(α1
3)
)−
(α02
H(α11).dh
h
dh
h|α
03
hH(dh)
)−
(α02
H(α11)
h.dh
dh
h|H(α1
3)
)+
(α02
hLH(α1
1)dh|
α03
hH(dh)
)+
(α02
hLH(α1
1)dh|H(α1
3)
)+
(LH(α1
1)α
12|α03
hH(dh)
)+(LH(α1
1)α
12|H(α1
3)).
rtèr ♥ts②♠étrq r♦t P♦ss♦♥ ♦♥ ét(LH(α1)
α2|H(α3))+ =
α01H(dh)(α0
2)
h2(dh|H(α1
3))+α01α
03
h2(LH(dh)α
12|H(dh)
)+
α01
h
(LH(dh)α
12|H(α1
3))+ α0
3
H(dh).α12
h2(dα0
1|H(dh))+H(dh).α1
2
h
(dα0
1|H(α13))+
α03α
02
h2
(LH(α1
1)dh|H(dh)
)− α0
1
H(dh).α12
h2(dh|H(α1
3))+H(α1
1)(α02)
h
(dh|H(α1
3))
−α02
H(α11).dh
h2(dh|H(α1
3))+α02
h
(LH(α1
1)dh|H(α1
3))+α03
h
(LH(α1
1)α
12|H(dh)
)+
(LH(α1
1)α
12|H(α1
3))+α02H(dh)(α0
3)
h2(dh|H(α1
1))+α02α
01
h2(LH(dh)α
13|H(dh)
)+
α02
h
(LH(dh)α
13|H(α1
1))+ α0
1
H(dh).α13
h2(dα0
2|H(dh))+H(dh).α1
3
h
(dα0
2|H(α11))+
α01α
03
h2
(LH(α1
2)dh|H(dh)
)− α0
2
H(dh).α13
h2(dh|H(α1
1))+H(α1
2)(α03)
h
(dh|H(α1
1))
−α03
H(α12).dh
h2(dh|H(α1
1))+α03
h
(LH(α1
2)dh|H(α1
1))+α01
h
(LH(α1
2)α
13|H(dh)
)+
(LH(α1
2)α
13|H(α1
1))+α02H(dh)(α0
3)
h2(dh|H(α1
1))+α02α
01
h2(LH(dh)α
13|H(dh)
)+
α03
h
(LH(dh)α
11|H(α1
2))+ α0
2
H(dh).α11
h2(dα0
3|H(dh))+H(dh).α1
1
h
(dα0
3|H(α12))+
α02α
01
h2
(LH(α1
3)dh|H(dh)
)− α0
3
H(dh).α11
h2(dh|H(α1
2))+H(α1
3)(α01)
h
(dh|H(α1
2))
−α01
H(α13).dh
h2(dh|H(α1
2))+α01
h
(LH(α1
3)dh|H(α1
2))+α02
h
(LH(α1
3)α
11|H(dh)
)+(
LH(α1
3)α
11|H(α1
2)).
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
♣rès rr♦♣♠♥t ♦♥ ♦t♥t
(LH(α1)
α2|H(α3))+ =
α01
h2[(H(dh)|d(α0
2)) (dh|H(α1
3))+(H(dh)|α1
3
) (dα0
2|H(dh))]
+
α01α
03
h2
[(LH(dh)α
12|H(dh)
)+(LH(α1
2)dh|H(dh)
)+
(LH(dh)dh|H(α1
2))]
+
α01
h
[(LH(dh)α
12|H(α1
3))+(LH(α1
2)α
13|H(dh)
)+(LH(α1
3)dh|H(α1
2))]
+
α03
h2[(H(dh)|α1
2
) (dα0
1|H(dh))+
(H(dh)|dα0
1
) (dh|H(α1
2))]
+
1
h
[(H(dh)|α1
2
) (dα0
1|H(α13))+(dh|H(α1
2)) (dα0
1|H(α13))]
+
α03α
02
h2
[(LH(α1
1)dh|H(dh)
)+(LH(dh)dh|H(α1
1))+
(LH(dh)α
11|H(dh)
)]+
− α01
h2[(H(dh)|α1
2
) (dh|H(α1
3))+(dh|H(α1
2)) (dh|H(α1
3))]
+
1
h
[(H(α1
1)|dα02
) (dh|H(α1
3))+(H(α1
1)|dα02
) (H(dh)|α1
3
)]+
− α02
h2[(H(α1
1)|dh) (dh|H(α1
3))+(H(α1
1)|dh) (H(dh)|α1
3
)]+
α02
h
[(LH(α1
1)dh|H(α1
3))+(LH(dh)α
13|H(α1
1))+(LH(α1
3)α
11|H(dh)
)]+
α03
h
[(LH(α1
1)α
12|H(dh)
)+(LH(α1
2)dh|H(α1
1))+(LH(dh)α
11|H(α1
2))]
(LH(α1
1)α
12|H(α1
3))+(LH(α1
2)α
13|H(α1
1))+(LH(α1
3)α
11|H(α1
2))
t q H stst s rt♦♥ ♥tr♥ ♥té s rt♦♥s
♥ rést q(LH(α1)
α2|H(α3))+ = 0
Pr rs ♣♦r t♦s α = α0dh
h+ α1 t β = β0
dh
h+ β1. ♦♥
(H(α)|β
)=
=
(α0H(dh)
h+H(α1)|β0
dh
h+ β1
)
=
(α0
1
hH(dh)|β0
dh
h
)+
(α0
1
hH(dh)|β1
)+
(H(α1)|β0
dh
h
)+ (H(α1|β1))
=α0
h(H(dh)|β1) +
β0h
(H(α1)|dh) + (H(α1)|β1)(H(β)|α
)=
=
(β0H(dh)
h+H(β1)|α0
dh
h+ α1
)
=
(β0H(dh)
h|α0
dh
h
)+α0
h(H(β1)|dh) +
β0h
(H(dh)|α1)) + (H(β1)|α1)
=α0
h(H(β1)|dh) +
β0h
(H(dh)|α1)) + (H(β1)|α1)(H(α)|β
)+(H(β)|α
)=
=α0
h((H(dh)|β1) + (H(β1)|dh)) +
β0h
((H(dh)|α1) + (H(α1)|dh))++(H(β1)|α1) + (β1|H(α1))
= 0 + 0 + 0 + 0
♦ù s♦tr♦♣ Gr(H).
é♠♦♥strt♦♥ ♦r♦r
st r q r♦t é♥t ♥s OX ② é♥t ♥ strtr èr
rst ♦♥ à érr ♥tté ♦ sr s st♦♥s rst♥ts MD.
t♣
♥ s ♦♥♥ u, v ∈ MD −OX t a ∈ OX ♦rs
u, v, aDD = u, 1vv, asD
=1
uvu, v, ass −
1
uv2u, vsv, as.
s♥st ♦♥ q
u, v, aDD+ =1
uvu, v, ass − 1
uv2u, vsv, as +
1
uvv, a, uss −
1
u2va, usv, us +
1
uva, u, vss −
1
uv2u, vsa, vs −
1
u2vu, vsa, us
t♣
♥ s ♦♥♥ v ∈ MD −OX t a, b ∈ OX . ♦rs
a, b, vDD = a, 1vb, vsD =
1
va, b, vss −
1
v2b, va, vs.
♠ê♠ ♥♦s ♦♥s
b, v, aDD = b, 1vv, asD
=1
vb, v, ass −
1
v2v, asb, vs
tv, a, bDD = v, a, bsD
=1
vv, a, bss
.
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
♥ ♥ ét ♦♥ q
a, b, vDD+ =1
va, b, vss −
1
v2b, va, vs+
+1
vb, v, ass −
1
v2v, asb, vs +
1
vv, a, bss
=1
va, b, vss +
1
vb, v, ass +
1
vv, a, bss
= 0
t♣
Pr♥♦♥s u, v, w ∈ MD −OX .
♦rs u, v, wDD = u, 1
vwv, wsD.
s1
vwv, ws ∈ OX ; r
1
vwv, ws = v, wD ∈ OX . ♥ rést q
u, v, wDD = u, 1
vwv, wsD.
=1
uvwu, v, wss −
1
uvw2v, wsu,ws −
1
uwv2v, wsu, vs.
♥ ♥ ét q
u, v, wDD+ =1
uvwu, v, wss −
1
uvw2v, wsu,ws −
1
uwv2v, wsu, vs
+1
uvwv, w, uss −
1
vwu2w, usv, us −
1
vuw2w, usv, ws
+1
uvww, u, vss −
1
wuv2u, vsw, vs −
1
wvu2u, vsw, us
=1
uvw(u, v, wss + v, w, uss + w, u, vss)
= 0.♥s −,−D stst ♥tté ♦ ♥ ♥ ét ♦♥ q st ♥ strtr
èr
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦♥t α, β ∈ ΩX(logD) ♦♥
Hα(Hβ) =α1β1h2
h, h,−+ α1
h2h, β1h,−+ α1β
j
hh, xj ,−+ α1
hh, βjxj ,−+
αiβ1h
xi, h,−+ αi
hxi, βjh,− − αiβj
h2xi, hh,−+ αiβjxi, xj ,−+
αixi, βjxj ,−.Hβ(Hα) =β1α1
h2h, h,−+ β1
h2h, α1h,−+ β1
hh, αixi,−+ β1α
i
hh, xi,−+
βjα1
hxj , h,−+ βj
h2xj , α1h,− −+
βjα1
h2xj , hh,−+ βjαixj , xi, +
βjxj , αixi,−.
t
♦♥Hα(Hβ)− Hβ(Hα) =
=α1
h2h, β1h,−+ αiβ1
hxi, h,−+ α1β
j
hh, xj,−+ α1
h2h, βjh,−+
β1h2
α1, hh,−+ β1hαi, hxi,−+ αi
hxi, βjh,−+ βj
hα1, xjh,−−
αiβæ
h2xi, hh,− − α1β
j
h2h, xjh,−+ αiβjxi, xj,−+ αixi, βjxj ,−+
βjαi, xjxi,−
Pr rs ♥♦s ♦♥sH([α, β]) =
=α1
h2h, β1h,−+ β1
h2α1, hh,−+ α1
hh, βjxi,−+ βj
hα1, xjh,−
+α1β
j
hh, xj,− − α1β
j
h2h, xjh,−+ αi
hxi, βjh,−+ β1
hαi, hxi,−+
αiβ1h
xi, h,− − αiβj
h2xi, hh, ,−+ αixi, βjxj ,−+ βjαi, xjxi,−+
αiβjxi, xj,−♥ ♥
H([α, β]) = [Hα, Hβ]
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
st qst♦♥ ♠♥r C[y]dx
x⊕ΩA ♥ strtr èr r strtr
P♦ss♦♥ s♥t
[dx, dy] := dx
t ΩA ♥ èr
②♥t st ①t ♦rt A♠♦s s♥t
0 // ΩA// ΩA ⊕ C[y]
dx
x// C[y]
dx
x// 0
st ♠ttr sr C[y]dx
x♥ strtr èr ♠♥èr à ♥ r ♥
①t♥s♦♥ s♥é r ♣rès ❬ss② t ❪
[γ1 + β1, γ2 + β2] = [γ1, γ2] + [β1, γ2]− [β2, γ1] + [β1, β2]
♦ù γi + βi ∈ ΩA ⊕ C[y]dx
x♣♦r i = 1, 2.
st ♥ strtr èr ♥s ΩA ⊕ C[y]dx
xà ♦♥t♦♥ q ΩA ♥ é
ΩA ⊕C[y]dx
x. st ♦♥ ♠♦♥trr q s r♦ts é♥s ♣r t s♦♥t
é①
P♦s♦♥s γ1 = γ01dx
x, β1 = β0
1dx+ β11dy t γ2 = γ02
dx
x, β2 = β0
2dx+ β12dy.
Pr ♥ rt ♦♥ ♦t♥t
[γ1, γ2] =
(γ01xx, γ02+
γ02xγ01 , x
)dx
x,
[β1, β2] =(β01x, β0
2+ β02β0
1 , x+ β12β0
1 , y+ β11y, β0
2+ (β01β
12 − β1
1β02))dx +(
β01x, β1
2+ β02β1
1 , x+ β11y, β1
2+ β12β1
1 , y)dy,
[β1, γ2] =γ02xβ0
1 , xdx+γ02xβ1
1 , xdy + (β01x, γ02+ β1
1y, γ02)dx
x,
[β2, γ1] =γ01xβ0
2 , xdx+γ01xβ1
2 , xdy + (β02x, γ01+ β1
2y, γ01)dx
x.
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
s étés q ♣réè♥t ♦♥ ét[γ1 + β1, γ2 + β2] = [γ1, γ2] + [β1, γ2]− [β2, γ1] + [β1, β2] =(γ01xx, γ02+
γ02xγ01 , x+ β0
1x, γ02+ β11y, γ02 − β0
2x, γ01 − β12y, γ01
)dx
x+
(γ02xβ0
1 , x −γ01xβ0
2 , x+ β01x, β0
2+ β02β0
1 , x+ β12β0
1 , y+ β11y, β0
2+ (β01β
12 − β1
1β02)
)dx+
(γ02xβ1
1 , x −γ01xβ1
2 , x+ β01x, β1
2+ β02β1
1 , x+ β11y, β1
2+ β12β1
1 , y)dy.
Pr rs γ1+β1 = (γ01 +xβ01)dx
x+β1
1dy, γ2+β2 = (γ02 +xβ02)dx
x+β1
2dy. ♥ ♣♣q♥t
r♦t é♥ ♣r ♦♥ ♦t♥t
[γ1 + β1, γ2 + β2] =
= [(γ01 + xβ01)dx
x, (γ02 + xβ0
2)dx
x] + [(γ01 + xβ0
1)dx
x, β1
2dy]
+ [β11dy, (γ
02 + xβ0
2)dx
x] + [β1
1dy, β12dy]
=(γ01 + xβ0
1)
xx, γ02 + xβ0
2dx
x+
(γ02 + xβ02)
xγ01 + xβ0
1 , xdx
x
+(γ01 + xβ0
1)
xx, γ12dy + β1
2γ01 + xβ01 , y
dx
x
+ β11y, γ02 + xβ0
2dx
x+γ02 + xβ0
2
xβ1
1 , xdy+ β1
1y, β12dy + β1
2β12 , ydy
= (γ01xx, γ02+ β0
1x, γ02+γ02xγ01 , x+ β0
2γ01 , x+ β12γ01 , y+ β1
1y, γ02)dx
x+ (β0
1x, β02+ γ01x, β0
2+ β02β0
1 , x+ γ02β01 , x+ β1
2β01 , y+ βy, β0
2+β12β
01 − β1
1β02)dx
+ (γ01xx, β1
2+ β01x, β1
2+γ02xβ1
1 , x+ β02β1
1 , x+ β11y, β1
2+ β12β1
1 , y)dy.
♥ ♥ été ré
é♠♦♥strt♦♥ ♠♠
♦♥t α, β t a ♦♠♠ ♥s ②♣♦tès ♠♠ ♥
[α, aβ] =
aα01
xx, β0
1dx
x+α01β
01
xx, adx
x+aβ0
1
xα0
1, xdx
x+α01a
xx;β1
1dy+
+α01β
11
xx, ady + aβ1
1α01, y
dx
x+ α1
1ay, β01dx
x+ α1
1β01y, a
dx
x+
+ aβ01α1
1, xdy + α11ay, β1
1dy + α11β
11y, ady + aβ1
1α11; ydy.
=
a(α01
xx, β0
1dx
x+β01
xα0
1, xdx
x+α01
xx;β1
1dy + β11α0
1, ydx
x
+ α11y, β0
1dx
x+ β0
1α11, xdy + α1
1y, β11dy + β1
1α11; ydy)
+ ((α01
xx, a+ α1
1y, a)β01
dx
x+ (
α01
xx, a+ α1
1y, a)β11dy)
=
a(α01
xx, β0
1dx
x+β01
xα0
1, xdx
x+α01
xx;β1
1dy + β11α0
1, ydx
x
+ α11y, β0
1dx
x+ β0
1α11, xdy + α1
1y, β11dy + β1
1α11; ydy)
+ (α01
xx, a+ α1
1y, a)β= H(α)(a).β + a[α, β].
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
♦♥t α = α01
dx
x+ α1
1dy t β = β01
dx
x+ β1
1dy ♥s ∈ ΩA(log I). ♥
H([α, β]) =1
x(α01
xx, β0
1+β01
xα0
1, x+ α11y, β0
1+ β11α0
1, y)x,−
(α01
xx, β1
1+β01
xα1
1, x+ α11y, β1
1+ β11α1
1, y)y,−
Pr rs ♦♥
H(α)H(β) =α01β
01
x2x, x,−+ α0
1
x2x, β0
1x,−+ α01β
11
xx, y,−+
α01
xx, β1
1y,−+ α11β
01
xy, x,−+ α1
1
xy, β0
1x,−+
−α11β
01
x2y, xx,−+ α1
1β11y, y,−+ α1
1y, β11y,−
H(β)H(α) =β01α
01
x2x, x,−+ β0
1
x2x, α0
1x,−+ β01α
11
xx, y,−+
β01
xx, α1
1y,−+ β11α
01
xy, x,−+ β1
1
xy, α0
1x,−+
−β11α
01
x2y, xx,−+ β1
1α11y, y,−+ β1
1y, α11y,−
H(α)H(β)− H(β)H(α) = H([α, β]) +
α11β
01
x(y, x,− − 1
xy, xx,− − x, y,−)
α11β
01
x(x, y,− − y, x,−+ 1
xy, xx,−).
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
r
y, x,− − 1
xy, xx,− − x, y,− =
= (y, x,−+ x, −, y+ x,−)= (y, x,−+ x, −, y+ −, y, x)= 0
t
x, y,− − y, x,−+ 1
xy, xx,− =
= x, y,−+ y, −, x − x,−= x, y,−+ y, −, x+ −, x, y= 0
♦ù réstt
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
st qst♦♥ ♠♦♥trr q qq s♦t α0, α1 t α2 ♥s ΩA(log I) ♦♥ 0 =
dρω (ω)(α0, α1, α2) = ρω(α0)ω(α1, α2)−ρω(α1)ω(α0, α2)+ρω(α2)ω(α0, α1)−ω([α0, α1], α2)+
ω([α0, α2], α1)−ω([α1, α2], α0.) st r sr s éé♠♥ts é♥értrs ΩA(log I).P♦r α0 =
du0u0
, α1 =du1u1
, α2 =du2u2
♦♥
dρω (ω)(α0, α1, α2) =1
u0u0,
1
u1u2u1, u2 −
1
u1u1,
1
u0u2u0, u2+
1
u2u2,
1
u0u1u0, u1
− 1
u2 1
u0u1u0, u1, u2+
1
u1 1
u0u2u0, u2, u1 −
1
u0 1
u1u2u1, u2, u0
=1
u0u1u2u0, u1, u2 −
1
u0u1u22u1, u2u0, u2
− 1
u0u2u21u1, u2u0, u1 −
1
u1u0u2u1, u0, u2+
1
u2u1u20u0, u2u1, u0
+1
u22u1u0u0, u2u1, u2+
1
u0u1u2u2, u0, u1 −
1
u2u1u20u0, u1u2, u0
− 1
u2u0u21u0, u1u2, u1+
1
u2u0u1u0, u1, u2+
1
u2u20u1u0, u1u0, u2
+1
u1u0u2u0, u2, u1 −
1
u1u20u2u0, u2u0, u1 −
1
u1u0u22u0, u2u2, u1
− 1
u0u1u2u1, u2, u0+
1
u0u21u2u1, u2u1, u0+
1
u0u1u22u1, u2u2, u2.
♥ ♣♣q♥t ① ♦s ♥tté ♦ ♦♥ ♦t♥t dρω (ω)(α0, α1, α2) = 0. ♠ê♠
♣♦r α0 =du0u0
, α2 =du1u1
, α2 = du2
dρω (ω)(α0, α1, α2) =1
u0u0,
1
u1u1, u2 −
1
u1u1,
1
u0u0, u2+ u2,
1
u0u1u0, u1
=1
u0u1u0, u1, u2 −
1
u0u21u1, u2u0, u1 −
1
u1u0u1, u0, u2+
1
u1u20u0, u2u1, u0
+1
u0u1u2, u0, u1 −
1
u0u21u0, u1u2, u1 −
1
u20u1u0, u1u2, u0 −
1
u0u1u0, u1, u2
+1
u0u21u0, u1u1, u2+
1
u20u1u0, u1u0, u2+
1
u1u0u0, u2, u1 −
1
u1u20u0, u2u0, u1
− 1
u0u1u1, u2, u0+
1
u0u21u1, u2u1, u0 = 0.
♠ê♠ ♦♥ ♠♦♥tr dρω (ω)(α0, α1, α2) = 0 ♣♦r α0 =du0u0
, α1 = du1, α2 = du2 ♥s q
♣♦r α0 = du0, α1 = du1, α2 = du2.
é♠♦♥strt♦♥ Pr♦♣♦st♦♥
P♦r ωi = aiduiui
+ bidvi ωj = ajdujuj
+ bjdvj t f ∈ A ♦♥
[ωi, fωj ] = ρω(ωi)(a)ωj + f [ωi, ωj ]
♥ t
♥♥① P♦♥ts ét qqs é♠♦♥strt♦♥s
[ωi, fωj ] = [aiduiui, faj
dujuj
] + [aiduiui, fbjdvj ] + [bidvi, faj
dujuj
]
=aiui
ui, faj+faiuj
ai, ujduiui
+ faiajd(1
uiujui, uj) +
aiui
ui, fbjdvj+
fbjai, vjduiui
+ faid(1
uiui, vj) + bivi, faj
dujuj
+fajuj
bi, ujdvi+
fbiajd(1
ujvi, uj) + bivi, fbjdvj + fbjbi, vjdvi + fbibjd(vi, vj)
=faiui
ui, ajdujuj
+aiajui
ui, fdujuj
+fajuj
ai, ujduiui
+
faiajd(1
uiujui, uj) +
faiui
ui, bjdvj +aibjui
ui, fdvj+
fbjai, vjduiui
+ faibjd(1
uiui, vj) + bifvi, aj
dujuj
+
fbivi, bjdvj + bibjvi, fdvj + fbjbi, vjdvi + fbibjd(vi, vj)= f(
aiui
ui, ajdujuj
+ajuj
ai, ujduiui
+ aiajd(1
uiujui, uj)
aiui
ui, bjdvj + bjai, vjduiui
+ aibjd(1
uiui, vj)
bivi, bjdvj +aiui
bi, ujdvi + biajd(1
ujvi, uj)+
bivi, bjdvj + bjbi, vjdvi + bibjd(vi, vj))+= f(
aiui
ui, ajdujuj
+ajuj
ai, ujduiui
+ aiajd(1
uiuj)
aiui
ui, bjdvj + bjai, vjduiui
+ aibjd(1
uiui, vj)
bivi, bjdvj +aiui
bi, ujdvi + biajd(1
ujvi, uj)+
bivi, bjdvj + bjbi, vjdvi + bibjd(vi, vj))+[(aiui
ui,−+ bjui
ui,−dvj + biajvi,−+ bjvi,−dvj)(f)
](aj
dujuj
+ bjdvj)
= f [ωi, ωj ] + (ρω(ωi)(f))ωj .
♦ù réstt
♥♥①
s ♣♦♥ts s qqs
s
♥tr♦t♦♥
t ♥♥① ♦r♥t qq éts sr s ♣♦♥ts s rt♥s ♥ ér
♥♦t♠♠♥t ♥♦t♦♥ étté ér♥t ♦♥strt ♣tr
s strtr f, g = xyzdf ∧ dg ∧ dp
dx ∧ dy ∧ dz
♥s s ♥♦s ♥♦s ♦♥♥♦♥s ♥ ♣♦②♥ô♠ ♥♦♥ ♦♥st♥t p ♥s A = C[x, y, z] râ
q ♥♦s é♥ss♦♥s r♦t P♦ss♦♥ ♦rt♠q s♥t
f, g = hdf ∧ dg ∧ dpdx ∧ dy ∧ dz
P♦r ér s ♥♦tt♦♥s ♥♦s ♦♥sér♦♥s s s♦♠♦r♣s♠s s♥ts
Ω1A(logD)
ϕ1−→ A3 ∼= A×A×Af1dx
x+ f2
dy
y+ f3
dz
z7→ (f1, f2, f3)
Ω2A(logD)
ϕ2−→ A3 ∼= A×A×Af1dy
y∧ dz
z+ f2
dz
z∧ dx
x+ f3
dx
x∧ dy
y7→ (f1, f2, f3)
Ω3A(logD)
ϕ2−→ Afdx
x∧ dy
y∧ dz
z7→ f
∧1DerA(logD)ψ1−→ A3 ∼= A×A×A
f1x∂x+ f2y∂y + f3z∂z 7→ (f1, f2, f3)
∧2DerA(logD)ψ2−→ A3 ∼= A×A×A
f1y∂y ∧ z∂z + f2z∂z ∧ x∂x+ f3x∂x ∧ y∂y 7→ (f1, f2, f3)
∧3DerA(logD)ψ3−→ A
fx∂x ∧ y∂y ∧ z∂z 7→ f
râ à s s♦♠♦r♣s♠s s ♦♣értrs é♥s ♣r éqt♦♥ ♥♥♥t
∂0f = ∂xh(∂yf∂zp− ∂zf∂yp)x∂x + ∂yh(∂zf∂xp− ∂xf∂zp)y∂y+
∂zh(∂xf∂yp− ∂yf∂xp)z∂z
♥♥① s ♣♦♥ts s qqs s
P♦r t♦t f ∈ A,
∂1 ~f =
∂yh(∂zf3∂xp− ∂xf3∂zp)− ∂zh(∂xf2∂yp− ∂yf2∂xp)
−f1x2∂2xxp− f2xy∂2xyp− f3xz∂
2xzp− f1x∂xp
∂zh(∂xf1∂yp− ∂yf1∂xp)− ∂xh(∂yf3∂zp− ∂zf3∂yp)
−f1xy∂2xyp− f2y2∂2yyp− f3yz∂
2yzp− f2y∂yp
∂xh(∂yf2∂zp− ∂zf2∂yp)− ∂yh(∂zf1∂xp− ∂xf1∂zp)
−f1xz∂2xzp− f2yz∂2yzp− f3z
2∂2zzp− f3z∂zp
P♦r t♦t ~f ∈ A3 t ♥ ♥
∂2 ~f = ∂xh(∂yf1∂zp− ∂zf1∂yp) + ∂yh(∂zf2∂xp− ∂xf2∂zp)+
∂zh(∂xf3∂yp− ∂yf3∂xp)
P♦r t♦t ~f ∈ A3. P♦s♦♥s Pi : A3 → A ♣r♦t♦♥ sr iè♠ ♦♠♣♦s♥t
♦♥tr♦♥s q ∂1 ∂0 = 0
♦t f ∈ A.
∂0(f) =
f1 = z∂zpy∂yf − y∂ypz∂zf
f2 = x∂xpz∂zf − z∂zpx∂xf
f3 = y∂ypx∂xf − x∂xpy∂yf
♣rès ♣r♠èr ♦♠♣♦s♥t p1(∂1(∂0(f))) st ♦♥♥é ♣r
P1(∂1(∂0(f))) = ∂yh(∂zf3∂xp− ∂xf3∂zp)− ∂zh(∂xf2∂yp− ∂yf2∂xp)
−f1x2∂2xxp− f2xy∂2xyp− f3xz∂
2xzp− f1x∂xp
♥ sstt♥t f1, f2, f3 ♣r rs ①♣rss♦♥s sss ♦♥ ♦t♥tP1(∂1(∂0(f))) = x2zy∂xp∂xf∂
2yzp+ x2yz∂xp∂yp∂
2xzf − x2yz∂xp∂yf∂
2zxp− x2yz(∂xp)
2∂2zyf−x2yz∂zp∂xf∂
2xyp− x2yz∂zp∂yp∂
2xxf − xzy∂zp∂yp∂xf + x2yz∂zp∂yf∂
2xxp+ x2yz∂zp∂xp∂
2xyf+
xyz∂zp∂xp∂yf − x2yz∂yp∂zf∂2xxp− x2yz∂yp∂xp∂
2xzf − xyz∂yp∂xp∂zf + x2yz∂yp∂xf∂
2xzp+
x2yz∂yp∂zp∂2xxf + xyz∂yp∂zp∂xf + x2yz∂xp∂zf∂
2xyp+ x2yz(∂xp)
2∂2yzf − x2yz∂xp∂xf∂2yz−
x2yz∂xp∂zp∂2yxf − x2z∂zp∂yf∂
2xxp+ x2yz∂yp∂zf∂
2xxp− x2yz∂xp∂zf∂
2xyp+ x2yz∂zp∂xf∂
2xyp
−x2yz∂yp∂xf∂2xzp+ x2yz∂xp∂yf∂2xzp− xyz∂zp∂yf∂xp+ xyz∂yp∂zf∂xp
= 0 ç♦♥ ♥♦ ♦♥ ♠♦♥tr q s trs ♦♠♣♦s♥ts s♦♥t t♦ts ♥s
♦♥tr♦♥s q ∂2 ∂1 = 0
P♦r ér s s t tr tr ♦♥ ♣♦s ♣♦r t♦t ~f =
(f1, f2, f3); (F1, F2, F3) = ~F = ∂1(~f).
♦rs ∂1 ~f =
F1 = ∂yh(∂zf3∂xp− ∂xf3∂zp)− ∂zh(∂xf2∂yp− ∂yf2∂xp)
−f1x2∂2xxp− f2xy∂2xyp− f3xz∂
2xzp− f1x∂xp
F2 = ∂zh(∂xf1∂yp− ∂yf1∂xp)− ∂xh(∂yf3∂zp− ∂zf3∂yp)
−f1xy∂2xyp− f2y2∂2yyp− f3yz∂
2yzp− f2y∂yp
F3 = ∂xh(∂yf2∂zp− ∂zf2∂yp)− ∂yh(∂zf1∂xp− ∂xf1∂zp)
−f1xz∂2xzp− f2yz∂2yzp− f3z
2∂2zzp− f3z∂zpP♦s♦♥s ♥♥
δ1 = −∼−→A 1; δ2 = −
∼−→A 2; δ3 = −
∼−→A 3
♣rès ♦♥ r ∂2(~F ) = δ1(F1) + δ2(F2) + δ3(F3) ♦rs
s strtr P♦ss♦♥ x, y = x.
F1 = δ2(f3)− δ3(f2)− f1x2∂2xxp− f2xy∂
2xyp− f3xz∂
2xzp− f1x∂xp
F2 = δ3(f1)− δ1(f3)− f1xy∂2yxp− f2y
2∂2yyp− f3yz∂2yzp− f2y∂yp
F3 = δ1(f2)− δ2(f1)− f1xz∂2zxp− f2yz∂
2zyp− f3z
2∂2zzp− f3z∂zpt ♦♥
∂2(~F ) =
δ1 δ2(f3)− δ1 δ3(f2)− δ1(f1x2∂2xxp)− δ1(f2xy∂
2xyp)− δ1(f3xz∂
2xzp)− δ1(f1x∂xp)+
δ2 δ3(f1)− δ2 δ1(f3)− δ2(f1xy∂2yxp)− δ2(f2y
2∂2yyp)− δ2(f3yz∂2yzp)− δ2(f2y∂yp)+
δ3 δ1(f2)− δ3 δ2(f1)− δ3(f1xz∂2zxp)− δ3(f2yz∂
2zyp)− δ3(f3z
2∂2zzp)− δ3(f3z∂zp)+ st ♦♥ r q tr♠ tt ①♣rss♦♥ t érr q♦♥ ♦t♥t
t♠♥t ③ér♦ ♦t t ♦♥ ♦t♥t
δ1 δ2(f3) = xyz2(∂zp∂2xyp∂z + ∂zp∂xp∂
2yz − ∂yp∂
2xzp∂z − ∂yp∂xp∂
2zz − ∂zp∂
2yzp∂x
−(∂zp)2∂2yx + ∂yp∂
2zzp∂x + ∂yp∂zp∂
2xz)f3 + xyz(∂yp∂zp∂x − ∂yp∂xp∂z)f3
δ2 δ1(f3) = xyz2(∂xp∂2zzp∂y + ∂zp∂
2xyp∂z − ∂xp∂yp∂2zz − ∂zp∂
2xzp∂y − ∂xp∂
2yzp∂z
−(∂zp)2∂2yx + ∂zp∂yp∂
2zx − ∂zp∂xp∂
2yz)f3 + xyz(∂xp∂zp∂y − ∂xp∂yp∂z)f3
δ1 δ3(f2) = xy2z(∂zp∂2yyp∂x + ∂zp∂yp∂
2yx + ∂yp∂
2xzp∂y + ∂yp∂xp∂
2yz − ∂y∂
2yzp∂x
−(∂yp)2∂2xz − ∂zp∂
2xyp∂y − ∂zp∂xp∂
2yy)f2 + xyz(∂zp∂yp∂x − ∂zp∂xp∂y)f2
δ3 δ1(f2) = xy2z(∂yp∂2xzp∂y + ∂yp∂zp∂
2yx + ∂xp∂
2yyp∂z + ∂xp∂yp∂
2yz − ∂x∂
2yzp∂y
−(∂yp)2∂2xz − ∂yp∂
2xyp∂z − ∂xp∂zp∂
2yy)f2 + xyz(∂xp∂yp∂z − ∂xp∂zp∂y)f2
δ2 δ3(f1) = x2yz(∂xp∂2zyp∂x + ∂xp∂yp∂
2xz + ∂zp∂xp∂
2xy + ∂zp∂
2xxp∂y − ∂xp∂
2xzp∂y
−(∂xp)2∂2yz − ∂zp∂yp∂
2xx − ∂zp∂
2yxp∂x)f1 + xyz(∂zp∂xp∂yp− ∂zp∂yp∂x)f1
δ3 δ2(f1) = x2yz(∂yp∂2xxp∂z + ∂yp∂xp∂
2xz + ∂xp∂zp∂
2xy + ∂xp∂
2yzp∂x − ∂xp∂
2xyp∂z
−(∂xp)2∂2yz − ∂yp∂zp∂
2xx − ∂yp∂
2zxp∂x)f1 + xyz(∂yp∂xp∂zp− ∂yp∂zp∂x)f1
−δ1(f1x∂x(x∂xp)) = −xyz∂zp∂yf1∂xp− x2yz∂yf1∂2xxp+ xyz∂yp∂zf1∂xp+
x2yz∂yp∂zf1∂2xxp− f1xyz∂zp∂
2xyp− f1x
2yz∂wp∂3xxyp+ f1xyz∂yp∂
2xzp+
f1x2yz∂yp∂
3xxzp
−δ1(f2xy∂2xyp) = −xy2z∂zp∂2xyf2 + xy2z∂yp∂2xyp∂zf2 − f2xyz∂zp∂
2xyp
−f2xy2z∂zp∂3xyyp+ f2xy2z∂yp∂
2xyzp
−δ1(f3xz∂2xzp) = −xz2y∂zp∂yf3∂2xzf2 + xz2y∂yp∂2xzp∂zf3 − f3xyz
2∂zp∂3xyzp
−f3xz2y∂yp∂3xzzp+ f3xyz∂yp∂2xzp
−δ2(f2y∂y(y∂yp)) = −xyz2∂xp∂yp∂zf2 + xyz∂zp∂yp∂xf2 − xy2z∂xp∂zf2∂2yyp
+xy2z∂zp∂xf2∂2yyp− f2xyz∂xp∂
2yzp+ f2xyz∂zp∂
2xyp− f2xy
2z∂xp∂yyzp+ f2xy2z∂zp∂
3xyyp
−δ2(f1xy∂2xyp) = −yx2z∂xp∂zf1∂2xyp+ yx2z∂zp∂2xyp∂xf1 − f1x
2yz∂xp∂3xyzp
+f1x2yz∂zp∂
3xxyp+ f1xyz∂zp∂
2xyp
−δ2(f3zy∂2zyp) = −xz2y∂xp∂2zyf3 + xz2y∂zp∂2zyp∂xf3 − f3xyz
2∂xp∂3yzzp
−f3xyz∂xp∂2zyp+ f3xz2y∂zp∂
3xyzp
−δ3(f3z∂z(z∂zp)) = −xyz∂yp∂zp∂xf3 − xyz2∂yp∂xf3∂2zzp+ xyz∂xp∂yf3∂zp
+xyz2∂xp∂yf3∂2zzp− f3xyz∂yp∂
2xzp− f3xyz
2∂yp∂2xzzp+ f3xyz∂xp∂
2yzp+ f3xyz
2∂xp∂3yzzp
−δ3(f1xz∂2xzp) = −x2yz∂yp∂xf1∂2xyp+ x2yz∂xp∂2xzp∂yf1 − f1x
2yz∂yp∂3xyxp
−f1xyz∂yp∂2xzp+ f1x2yz∂xp∂
3xyzp
−δ3(f2yz∂2yzp) = −y2xz∂yp∂xf2∂2zyp+ xy2z∂xp∂2yzp∂yf2 − f2xy
2z∂yp∂3xyzp
+f2xy2z∂xp∂
3yyzp+ f2xyz∂xp∂
2yzp
s strtr P♦ss♦♥ x, y = x.
♥s t ♥♥① ♥♦s ♥♦s ♣r♦♣♦s♦♥s érr sr ①♠♣ x, y = x tté
strtr èr ♥rt sr ΩA(log xA).
s éé♠♥ts ♠♦ ΩA(log xA) s♦♥t s♦s ♦r♠ αdx
x+ βdy ♦ù α, β ∈ A.
♥♥① s ♣♦♥ts s qqs s
♦♥t α1 = α01
dx
x+ α1
1dy, α2 = α02
dx
x+ α1
2dy, α3 = α03
dx
x+ α1
3dy tr♦s éé♠♥ts
ΩA(log xA).
♦rs
[α1, α2] = [α01
dx
x, α0
2
dx
x] + [α0
1
dx
x, α1
2dy] + [α11dy, α
02
dx
x] + [α1
1dy, α12dy].
r [α01
dx
x, α0
2
dx
x] = (α0
1∂yα02 − α0
2∂yα01)dx
x, [α0
1
dx
x, α1
2dy] = xα12∂xα
01
dx
x+ α0
1∂yα12dy,
[α11dy, α
02
dx
x] = −xα1
1∂xα02
dx
x− α0
2∂yα11dy, [α
11dy, α
12dy] = (xα1
2∂xα11 − xα1
1∂xα12)dy
s♥st q
[α1, α2] = (α01∂yα
02 − α0
2∂yα01 + xα1
2∂xα01 − xα1
1∂xα02)dx
x+ (α0
1∂yα12 − α0
2∂yα11 + xα1
2∂xα11 −
xα11∂xα
12)dy
P♦s♦♥s α = α01∂yα
02 −α0
2∂yα01 + xα1
2∂xα01 − xα1
1∂xα02 t β = α0
1∂yα12 −α0
2∂yα11 + xα1
2∂xα11 −
xα11∂xα
12.
♥ ♦rs
[[α1, α2], α3] = [αdx
x+ βdy, α0
3
dx
x+ α1
3dy]
= [αdx
x, α0
3
dx
x] + [α
dx
x, α1
3dy] + [βdy, α03
dx
x] + [βdy, α1
3dy]
r
[αdx
x, α0
3
dx
x] = (α∂yα
03 − α0
3∂yα)dx
x, [α
dx
x, α1
3dy] = xα13∂xα
dx
x+ α∂yα
13dy,
[βdy, α03
dx
x] = −xβ∂xα0
3
dx
x− α0
3∂yβdy, [βdy, α13dy] = (xα1
3∂xβ − xβ∂xα13)dy.
♦♥
[[α1, α2], α3] = (α∂yα03 − α0
3∂yα + xα13∂xα + xβ∂xα
03)dx
x+ (α∂yα
13 − α0
3∂yβ + xα13∂xβ −
xβ∂xα13)dy.
♥ ♦♥sèr s ♣♣t♦♥s Pi : ΩA(log xA) → A é♥s ♣r
P1(adx
x+ bdy) = a t P2(a
dx
x+ bdy)) = b t ♦♥ ♣♦s
A123 := P1([[α1, α2], α3]), A231 := P1([[α2, α3], α1]) t A312 := P1([[α3, α1], α2]).
Pr rs s ♥♦s ♣♦s♦♥s B123 := P2([[α1, α2], α3]), B231 := P2([[α2, α3], α1]) t
B312 := P2([[α3, α1], α2]),
♦rs
A123 = α∂yα03 −α0
3∂yα+ xα13∂xα+ xβ∂xα
03 t B123 = α∂yα
13 −α0
3∂yβ + xα13∂xβ − xβ∂xα
13.
Pr rs∂y(α) = ∂y(α
01∂yα
02 − α0
2∂yα01 + xα1
2∂xα01 − xα1
1∂xα02)
= ∂yα01∂yα
02 + α0
1∂2yyα
02 − ∂yα
02∂yα
01 − α0
2∂2yyα
01 + x∂yα
12∂xα
01+
xα12∂
2yxα
01 − x∂yα
11∂xα
02 − xα1
1∂2xyα
02
∂xα = ∂x(α01∂yα
02 − α0
2∂yα01 + xα1
2∂xα01 − xα1
1∂xα02)
= ∂xα01∂yα
02 + α0
1∂2xyα
02 − ∂xα
02∂yα
01 − α0
2∂2xyα
01 + α1
2∂xα01 + x∂xα
12∂xα
01 + xα1
2∂2xxα
01
−α11∂xα
02 − x∂xα
11∂xα
02 − xα1
1∂2xxα
02
s strtr P♦ss♦♥ x, y = x.
♥ ♦t♥t ♦♥
A123 = α01∂yα
02∂yα
03 − α0
2∂yα01∂yα
03 + xα1
2∂xα01∂yα
03 − xα1
1∂xα02∂yα
03 − α0
3∂yα01∂yα
02
−α03α
01∂
2yyα
02 + α0
3∂yα02∂yα
01 + α0
3α02α
2yyα
01 − xα0
3∂yα12∂xα
01 − xα0
3α12∂
2yxα
01 + xα0
3∂yα11∂xα
02+
xα03α
11∂
2xyα
02 ++xα1
3∂xα01∂yα
02 + xα1
3α01∂
2xyα
02 − xα1
3∂xα02∂yα
01 − xα1
3α02∂
2xyα
01 + xα1
3α12∂xα
01+
x2α13∂xα
12∂xα
01 + x2α1
3α12∂
2xxα
01 − xα1
3α11∂xα
02 − x2α1
3∂xα11∂xα
02 − x2α1
3α11∂
2xxα
02 − xα0
1∂yα12∂xα
03+
xα02∂yα
11∂xα
03 + x2α1
1∂xα12∂xα
03 − x2α1
2∂xα11∂xα
03
A231 = α02∂yα
03∂yα
01 − α0
3∂yα02∂yα
01 + xα1
3∂xα02∂yα
01 − xα1
2∂xα03∂yα
01 − α0
1∂yα02∂yα
03
−α01α
02∂
2yyα
03 + α0
1∂yα03∂yα
02 + α0
1α03∂
2yyα
02 − xα0
1∂yα13∂xα
02 − xα0
1α13∂
2yxα
02 + xα0
1∂yα12∂xα
03+
xα01α
12∂
2xyα
03 ++xα1
1∂xα02∂yα
03 + xα1
1α02∂
2xyα
03 − xα1
1∂xα03∂yα
02 − xα1
1α03∂
2xyα
02 + xα1
1α13∂xα
02+
x2α11∂xα
13∂xα
02 + x2α1
1α13∂
2xxα
02 − xα1
1α12∂xα
03 − x2α1
1∂xα12∂xα
03 − x2α1
1α12∂
2xxα
03 − xα0
2∂yα13∂xα
01+
xα03∂yα
12∂xα
01 + x2α1
2∂xα13∂xα
01 − x2α1
3∂xα12∂xα
01
A312 = α03∂yα
01∂yα
02 − α0
1∂yα03∂yα
02 + xα1
1∂xα03∂yα
02 − xα1
3∂xα01∂yα
02 − α0
2∂yα03∂yα
01
−α02α
03∂
2yyα
01 + α0
2∂yα01∂yα
03 + α0
2α01∂
2yyα
03 − xα0
2∂yα11∂xα
03 − xα0
2α11∂
2yxα
03 + xα0
2∂yα13∂xα
01+
xα02α
13∂
2xyα
01 ++xα1
2∂xα03∂yα
01 + xα1
2α03∂
2xyα
01 − xα1
2∂xα01∂yα
03 − xα1
2α01∂
2xyα
03 + xα1
2α11∂xα
03+
x2α12∂xα
11∂xα
03 + x2α1
2α11∂
2xxα
03 − xα1
2α13∂xα
01 − x2α1
2∂xα13∂xα
01 − x2α1
2α13∂
2xxα
01 − xα0
3∂yα11∂xα
02+
xα01∂yα
13∂xα
02 + x2α1
3∂xα11∂xα
02 − x2α1
1∂xα13∂xα
02
♦ù A123 +A231 +A312 = 0
P♦r ♠♦♥trr qB123+B231+B312 = 0 ♦♥ ♣t ♣r♦ér ♦♠♠ sss ♥ r♠♣ç♥t
α t β ♣r rs ①♣rss♦♥s rs♣ts ♦s ♦♥s ♣r♦ér tr♠♥t é st tsr
♥tté ♦ strtr P♦ss♦♥ s♦♥t
♠rq♦♥s q
[[α1, α2], α3] = [[α01
dx
x, α0
2
dx
x], α0
3
dx
x] + [[α0
1
dx
x, α0
2
dx
x], α1
3dy] + [[α01
dx
x, α1
2dy], α03
dx
x] +
[[α01
dx
x, α1
2dy], α13dy] + [[α1
1dy, α02
dx
x], α0
3
dx
x] + [[α1
1dy, α02
dx
x], α1
3dy]
[[α11dy, α
12dy], α
03
dx
x] + [[α1
1dy, α12dy], α
13dy]
♥ ♥st ♠♠ s♥t
♠♠ s ♥♦tt♦♥s sss ♦♥
[[α01
dx
x, α0
2
dx
x]+ = 0
[[α11dy, α
12dy], α
13dy]+ = 0
Pr
P♦r q st ♣r♠èr été ♦♥
♥♥① s ♣♦♥ts s qqs s
[[α01
dx
x, α0
2
dx
x]+ =
= ( 1x(α0
1
xx, α0
2+α0
2
xα0
1, x)x, α03+
α0
3
xα
0
1
xx, α0
2+α0
2
xα0
1, x, x)dx
x= ( 1
x(α0
1
xx, α0
2x, α03+
α0
2
xα0
1, xx, α03) +
α0
3
xx, α0
2α0
1
x, x+ α0
3
x
α0
1
xx, α0
2, x+α0
3
xα0
1, xα0
2
x, x+ α0
3
x
α0
2
xα0
1, x, x)dx
x+
= ( 1x(α0
1
xx, α0
2x, α03+
α0
2
xα0
1, xx, α03) +
α0
3
x2 x, α02α0
1, x −α0
3
x
α0
1
x2 x, α01x, x+
α0
3
x
α0
1
xx, α0
2, x+α0
3
x2 α01, xα0
2, x −α0
3
x
α0
2
x2 α01, xx, x+
α0
2
x
α0
3
xα0
1, x, x)dx
x+
= ( 1x(α0
1
xx, α0
2x, α03+
α0
2
xα0
1, xx, α03) +
α0
3
x
α0
1
xx, α0
2, x+α0
2
x
α0
3
xα0
1, x, x)dx
x+
= (α0
1
x2 x, α02x, α0
3+α0
2
x2 α01, xx, α0
3+α0
3
x
α0
1
xx, α0
2, x+α0
2
x
α0
3
xα0
1, x, xα0
2
x2 x, α03x, α0
1+α0
3
x2 α02, xx, α0
1+α0
1
x
α0
2
xx, α0
3, x+α0
3
x
α0
1
xα0
2, x, xα0
3
x2 x, α01x, α0
2+α0
1
x2 α03, xx, α0
2+α0
2
x
α0
3
xx, α0
1, x+α0
1
x
α0
2
xα0
3, x, x)dx
x= 0
P♦r q st ♦♥ [[α1
1dy, α12dy], α
13dy]+ =
= [(α11y, α1
2+ α12α1
1, y)dy, α13dy]+
= (α11y, α1
2+ α12α1
1, y)y, α13+ α1
3α11y, α1
2+ α12α1
1, y, y)dy+
= (α11y, α1
2y, α13+ α1
2α11, yy, α1
3+ α13α
11y, α1
2, y+ α13α
12α1
1, y, yα13y, α1
2α11, y+ α1
3α11, yα1
2, y +
α12y, α1
3y, α11+ α1
3α12, yy, α1
1+ α11α
12y, α1
3, y+ α11α
13α1
2, y, yα11y, α1
3α12, y+ α1
1α12, yα1
3, y +
α13y, α1
1y, α12+ α1
1α13, yy, α1
2+ α12α
13y, α1
1, y+ α12α
11α1
3, y, yα12y, α1
1α13, y+ α1
2α13, yα1
1, y)dy= 0
s♥st q s ♦♥ts dy rst♥t ♣r♦♥♥♥t
[[α01
dx
x, α0
2
dx
x], α1
3dy]+[[α01
dx
x, α1
2dy], α03
dx
x]+[[α0
1
dx
x, α1
2dy], α13dy]+[[α1
1dy, α02
dx
x], α0
3
dx
x]+
[[α11dy, α
02
dx
x], α1
3dy] + [[α11dy, α
12dy], α
03
dx
x]
P♦r tr♠♥r st ♠♦♥trr q s r♥èrs s♦♥t ♥s P♦r ♣r♦♦♥s
♠♠ s♥t
♠♠ ♦t 〈−,−〉 r♦t té DerA(log xA) = Ω∗A(log xA). ♦rs
〈[[α01
dx
x, α0
2
dx
x], α1
3dy] + [[α01
dx
x, α1
2dy], α03
dx
x] + [[α1
1dy, α02
dx
x], α0
3
dx
x], ∂y〉+ = 0
〈[[α01
dx
x, α1
2dy], α13dy] + [[α1
1dy, α02
dx
x], α1
3dy] + [[α11dy, α
12dy], α
03
dx
x], ∂y〉+ = 0
Pr
P♦r q st ♥♦s ♦♥s
〈[[α01
dx
x, α0
2
dx
x], α1
3dy] + [[α01
dx
x, α1
2dy], α03
dx
x] + [[α1
1dy, α02
dx
x], α0
3
dx
x], ∂y〉+ =
=α0
1
x2 x, α02x, α1
3+α0
2
x2 α01, xx, α1
3+α0
3
x
α0
1
xx, α1
2, x+α0
3
x2 x, α12α0
1, x+α0
3
x
α0
2
xα1
1, x, x+α0
3
x2 α11, xα0
2, x +α0
2
x2 x, α03x, α1
1+α0
3
x2 α02, xx, α1
1+α0
1
x
α0
2
xx, α1
3, x+α0
1
x2 x, α13α0
2, x+α0
1
x
α0
3
xα1
2, x, x+α0
1
x2 α12, xα0
3, x +α0
3
x2 x, α01x, α1
2+α0
1
x2 α03, xx, α1
2+α0
2
x
α0
3
xx, α1
1, x+α0
2
x2 x, α11α0
3, x+α0
2
x
α0
1
xα1
3, x, x+α0
2
x2 α13, xα0
1, x +
s strtr P♦ss♦♥ x, y = x.
♥t à ♦♥
〈[[α01
dx
x, α1
2dy], α13dy] + [[α1
1dy, α02
dx
x], α1
3dy] + [[α11dy, α
12dy], α
03
dx
x], ∂y〉+
=α0
1
xx, α1
2y, α13+
α1
2
xα0
1, yx, α13+
α1
3α0
1
xx, α1
2, y+α1
3
xx, α1
2α01, y+
−α1
3α0
1
x2 x, α12x, y+
α1
1
xy, α0
2x, α13+
α0
2
xα1
1, xy, α13+
α1
3α0
2
xα1
1, x, y+α1
3
xα1
1, xα02, y −
α1
3α0
2
x2 α11, xx, y+
α0
3α1
1
xy, α1
2, x+α0
3
xy, α1
2α11, x+
α0
3α1
2
xα1
1, y, x+α0
3
xα1
1, yα12, x
α0
2
xx, α1
3y, α11+
α1
3
xα0
2, yx, α11+
α1
1α0
2
xx, α1
3, y+α1
1
xx, α1
3α02, y+
−α1
1α0
2
x2 x, α13x, y+
α1
2
xy, α0
3x, α11+
α0
3
xα1
2, xy, α11+
α1
1α0
3
xα1
2, x, y+α1
1
xα1
2, xα03, y −
α1
1α0
3
x2 α12, xx, y+
α0
1α1
2
xy, α1
3, x+α0
1
xy, α1
3α12, x+
α0
1α1
3
xα1
2, y, x+α0
1
xα1
2, yα13, x
α0
3
xx, α1
1y, α12+
α1
1
xα0
3, yx, α12+
α1
2α0
3
xx, α1
1, y+α1
2
xx, α1
1α03, y+
−α1
2α0
3
x2 x, α11x, y+
α1
3
xy, α0
1x, α12+
α0
1
xα1
3, xy, α12+
α1
2α0
1
xα1
3, x, y+α1
2
xα1
3, xα01, y −
α1
2α0
1
x2 α13, xx, y+
α0
2α1
3
xy, α1
1, x+α0
2
xy, α1
1α13, x+
α0
2α1
1
xα1
3, y, x+α0
2
xα1
3, yα11, x
= 0
♠♥èr ♥♦ ♦♥ ♣r♦
♦r♣
❬ss② t ❪ ♠tr ss② Ptr ❲ ♦r t ❲♦♥ ♣♣rt ①
t♥s♦♥ ♦ rs r♥ r♦♥r ♥sttt t t♠ts P②s ♦t③
♠♥♥ss té ♥ ♣
❬t② t♥ ❪ r♥s t② t t♥ ♦♠tr② ♥ ②
♥♠s ♦ ♠♥t ♠♦♥♦♣♦s Pr♥t♦♥ ❯♥rst② Prss P♦rtr
trs té ♥ ♣
❬r ❪ P r ♣r♥♣s ♦ q♥t♠ ♠♥s ①♦r ❯♥rst② Prss
té ♥ ♣s t
❬♦♥s♦♥ ❪ ♠♦♥ r♥ ♦♥s♦♥ ♠s qt♦♥s ♥ t sst♦♥ ♦
♠♦♥♦♣♦s ♦♠♠♥ t P②s ♦ ♣s té ♥ ♣
❬♦♥♦ ❪ ♦s♣ ♦♥♦ ♦rt♠ P♦ss♦♥ ♦♦♠♦♦② ①♠♣ ♦ t♦♥
♥ ♣♣t♦♥ t♦ ♣rq♥t③t♦♥ ❳ ♣t ♥r té
♥ ♣
❬♦t♦ ❪ ②s ♦t♦ ♦③♥s②❲tt♥ ♥r♥ts ♦ ♦ ②♠♣t ♥♦s ♦♥
t♠♣♦rr② t♠ts ♦ ♣s té ♥ ♣s t
❬♦ss t ❪ ♦ss rtr♠ ♦st♥t t ① ♦s♥r r♥t
♦r♠s ♥ r ♥ rs r♥s ♠r t ♦ ♦ ♥♦ ♣s
rs té ♥ ♣
❬s♠♥♥ ❪ ♦♥♥s s♠♥♥ P♦ss♦♥ ♦♦♠♦♦② ♥ q♥t③t♦♥
♥ ♥ t ♦ ♣s té ♥ ♣s t
❬♦r♦s♥ t ❪ ♦r♦s♥ t ❱ ts♦ ♠② ♦ P♦ss♦♥
strtrs ♦♥ r♠t♥ s②♠♠tr s♣s té ♥ ♣s t
❬♦st♥t ❪ rtr♠ ♦st♥t ♥t③t♦♥ ♥ ♥tr② r♣rs♥tt♦♥ Prt Pr
q♥t③t♦♥ tr ♥ ♠♦r♥ ♥②ss ♥ ♣♣t♦♥ ♣s ♣
té ♥ ♣
❬♦t♦ ❪ ①② ♦t♦ ♠rs ♦♥ ♦♠tr ♥t③t♦♥ ♦ ♠tr① ②♣ P♦ss♦♥
rts ♦rt t ③ té ♥ ♣
❬rss ❪ rss ♦t♥ rt ♥ ♥♦♥ rs t
♦ts t ♥♦ ♣s té ♥ ♣s t
❬♥r♦③ ❪ ♥r♦③ s rétés P♦ss♦♥ t rs èrs s
s♦és ♦♠ ♦ ♣s té ♥ ♣
❬♦t♦ ❪ ♦t♦ rs ♦r♠r ♦r r♥ sss ss♦t t ♦rt♠
♦♥♥t♦♥s ♦②♦ té ♥ ♣
❬t♦ ❪ r♥♦ t♦ ♦ ♣ ♦r ♦♦♥♦♠ ②st♠ P ②♦t♦ ❯♥
♦ ♥♦ ♣s ♠ té ♥ ♣s t
❬P♦s ❪ ♠ P♦s r ♦♠tr② ♦ P♦ss♦♥ rts ♦r♥ ♦
t♠t ♥s ♦ ♥♦ té ♥ ♣s t
❬♥rt ❪ ♥rt r♥t ♦r♠s ♦r ♥r ♦♠♠tt rs r♥s
♠r t ♦ ♦ ♣s té ♥ ♣
❬t♦ ❪ ②♦ t♦ ♦r② ♦ ♦rt♠ r♥t ♦r♠s ♥ ♦rt♠ t♦r
s ❯♥ ♦②♦ ♦ ♣s té ♥
♣s t
♦r♣
❬♦r ❪ ♦r trtr s s②stè♠s ②♥♠qs ♥♦ té ♥
♣
❬r ❱rr ❪ r♠♥♦ r t ♥♦s ❱rr ❱rétés rt
rs s s♦t♦♥s ♣tqs P Pr♦♥s ♦ t ♥♦r♥ ♦♥r♥ ♦♥
♦♠tr② ♦♠② ♥st♥ ♦♦ ♥② ♣s
té ♥ ♣
❬❯r♥ ❪ ❲ ❯r♥ ♣rq♥t③t♦♥ ♣rs♥tt♦♥ ♦ P♦ss♦♥ r
♥ t ♦ ♣s té ♥ ♣s t
❬❱♥♦r♦ ❪ ❱♥♦r♦ ♦ r ♦ ♥r rt ♦♣rt♦rs
♦t t ♦ ♦ ♣s té ♥ ♣
és♠é ♦t tt tès st ♣r♦♣♦sr s rtèrs ♣réq♥tt♦♥ s
strtrs P♦ss♦♥ à s♥rtés ♣♦rtés ♣r ♥ sr r ♥ rété ♦♠♣①
♠♥s♦♥ ♥
P♦r ♥♦s ♣rt♦♥s ♥ ♦♥strt♦♥ érq s ér♥ts ♦r♠s ♦rt
♠qs ♦♥ ♥ é ♥♠♥t ♥♥ré t ♣r♦♣r ♥ èr ♦♠♠tt ♣♦r
♥tr♦r ♥♦t♦♥ èr P♦ss♦♥ ♦rt♠q Ps ♥♦s ♠♦♥tr♦♥s q ts
strtrs P♦ss♦♥ ♥s♥t ♥ ♥♦ ♥r♥t ♦♦♠♦♦q ♣r t ♥
strtr èr ♥rt qs ♥s♥t sr ♠♦ s ér♥ts
♦r♠s ♦rt♠qs râ à r♥r ♥♦s ét♦♥s s ♦♥t♦♥s ♥térté s
ts strtrs P♦ss♦♥
♦t ♦r ♥♦s ♠♦♥tr♦♥s q ♣♣t♦♥ ♠t♦♥♥♥ t♦t strtr P♦ss♦♥
♦rt♠q s ♣r♦♦♥ sr ♠♦ s ér♥ts ♦r♠s ♦rt♠qs t
♥t ♥ strtr èr ♥rt sr r♥r ♣s ♠ tt
♣♣t♦♥ st ♦♥t♥ ♥s ♠♦ s ért♦♥s ♦rt♠qs ♦s ♣♣♦♥s
♦♦♠♦♦ P♦ss♦♥ ♦rt♠q ♦♦♠♦♦ ♥t ♣r tt r♣rés♥tt♦♥
Pr st ♥♦s ♠♦♥tr♦♥s sr qqs ①♠♣s q s r♦♣s ♦♦♠♦♦s
P♦ss♦♥ t ① P♦ss♦♥ ♦rt♠q s♦♥t ♥ é♥ér ér♥ts ♥ qs ♦ï♥♥t
♥s s s strtrs P♦ss♦♥ ♦s②♠♣tqs
♦s tr♠♥♦♥s ♣r ♥ ét s ♦♥t♦♥s ♥térté ts strtrs ♠♦②♥
tt ♦♦♠♦♦
♦ts és trtrs P♦ss♦♥ ♦♦♠♦♦ P♦ss♦♥ sr r
èr ♥rt q♥tt♦♥ ért♦♥ ♦♥trr♥t ♦rt♠q strtr
♦s②♠♣tq strtr P♦ss♦♥ ♦rt♠qs
strt ♠♥ ♦t ♦ ts tss s t♦ ♣r♦♣♦s rtr ♦ ♣rq♥t③t♦♥ ♦
s♥r P♦ss♦♥ strtrs t s♥rts rr ② r s♦r ♦ ♥t ♠♥s♦♥
♦♠♣① ♠♥♦
♦r ts strt r♦♠ ♥ r ♦♥strt♦♥ ♦ ♦r♠ ♦rt♠ r♥ts ♦♥
♥t② ♥rt ♥♦♥ tr ♦ ♦♠♠tt ♥ ♥tr② r ❲ ♥tr♦
t ♦♥♣t ♦ ♦rt♠ P♦ss♦♥ r ♥ s♦ tt ts P♦ss♦♥ strtrs
♥ ♥ ♦♦♠♦♦ ♥r♥t ts s ♦ t ♥rt r strtr
tt t② ♥ ♦♥ t ♠♦ ♦ ♦r♠ ♦rt♠ r♥ts ❲t t ttr
st② t ♥tr ♦♥t♦♥s ♦ s P♦ss♦♥ strtrs
rst s♦ tt t ♠t♦♥♥ ♠♣ ♦ ♦rt♠ P♦ss♦♥ strtr ①t♥s t♦ t
♠♦ ♦ ♦r♠ ♦rt♠ r♥t ♥ ♥s strtr ♦ ♥rt
r ♦♥ t rtr♠♦r s♦ tt ts ♠ s ♦♥t♥ ♥ t ♠♦ ♦ ♦rt♠
rt♦♥s ❲ ♦rt♠ P♦ss♦♥ ♦♦♠♦♦ t ♦♦♠♦♦ ♥ ② ts
r♣rs♥tt♦♥
sq♥t② s♦ ♦♥ s♦♠ ①♠♣s tt P♦ss♦♥ ♦♦♠♦♦s r♦♣s ♥ P♦ss♦♥
♦rt♠ ♦♦♠♦♦s r♦♣s r r♥t ♥ ♥r t♦ t② ♦♥ ♥ t s
♦ ♦s②♠♣t P♦ss♦♥ strtrs ❲ ♦♥ t st② t ♣rq♥t③t♦♥ ♦♥
t♦♥s ♦ s strtrs ② ♠♥s ♦ ts ♦♦♠♦♦②
②♦rs P♦ss♦♥ strtrs P♦ss♦♥ ♦♦♠♦♦② r s♦r ♥rt r
q♥t③t♦♥ ♦s②♠♣t strtr ♦rt♠ P♦ss♦♥ strtrs ♦rt♠ ♦♥trr
♥t rt♦♥