wholeissue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\...
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a + b + c = 1f 4�C �B4M:�A+GB6�A
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A B
CD
E
αα
ββ
δ
2δ
γ
2γ
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ABCDCP8
2(α + β) + 3(γ + δ) = 2πf
� ?<LFL�CK:<¥VA+G34w6�:<¥\2K4M8FCK: 4EAB6�:<; 4ECD
TBCK472K;38α + β = 2(δ + γ)
f� ID=BL A+G34a6�J<=7�B4 4��>?<67ADCK=B:38�¢M� 4 ¥74\A
α + β =4π
7
f ß � à� 47: i 4>¢>A+G34�6 i ?BAD4a6M:<¥\254 J34�Aæ� 4M4M:
AC6�:<;
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7
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2α + β + δ = πf
Ú 8*CP:<¥�ß � à*¢M� 4 ¥74\Aα + δ =
3π
7
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T>C54�25;B8�A+G34a4��>?<67ADCK=B:α+2β +γ = π
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3π
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π
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x2 + cx + d = 06�ID4
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� CK: i 4�A+G34aID=3=�AD8�=>k A+G34 4��>?<67ADCK=B:x2 + ax − b = 0
6MID4a6�:<;
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f�� CPLNC@2K6MID2 Ty¢�8+CK: i 4XA+G34RID=3=�AD8�=>k3A+G34�4��>?<67ADCK=B:x2 + cx + d = 0
6�ID4b6�:<;
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a¢b¢c¢df
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á f ¡M4\Ax¢y¢zJ34�H<=B8*C�ADC��B4aID4M672y:B?<L�J34MI�8X8+? i G�A+GB67A
x2 + y2 + z2 = 1f 1<ID=M�B4A+GB67A
x2yz + xy2z + xyz2 ≤ 13
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m ≥ nfQ� G347:
m ≥ 3f ��=B:38+C5;34MIO6 i =>2K=>?<IDCP:<¥��C@A+G�:<=�ID4M;"I�C5¥7G�A+�+6�:<¥\2K4�; AEI�CK6M:<¥\254�Aæ� =�=>kB� G3=B8-4O8+C5;34M8�6�ID4OH<6MI�6M2@254�2>AE=aA+G34O8*CK;<478=>k0A+G34N¥�I�C5;�ß56�J<JBID4-�BCP67AD4�;�:<=QID4M; 7<g0� à f � CK: i 4
m ≥ n¢ CPk�4M6 i G�2PCP:<4 i =B:>AD67CK:38O6�A25476�8EA�Aæ� =aID4M; Hr=>CP:>AD8\¢7A+G347:�6�A025476�8EA�Aæ� = =>k>A+G347L'� =>?32K;�GB6\�B4X6OID4M; Hr=>CP:>A�=B:aA+G34896ML�4 i =>2@?<LF:y¢�� G>C i G � =>?325;N¥\C��B4�6 ID4M; 7<g0� ¢B6 i =B:>AEI�6�;BC i ADC5=B: f� G>?<8\¢MA+G347ID4O4*òMCK8EAD8�6�2PCP:<4���C�A+Ga:<=aL�=BID4�A+GB6�:�=B:<4XID4M; Hr=>CP:>A f�Ù 472K4�ADCP:<¥�A+G>CK82PCP:<4B¢y� 4�=3J�AD67CK:V6 i =>25=>?<ID4M;
(m − 1) × nID4 i AD6M:<¥\?32K6MI�¥�I�C5;Q��C@A+GS:<=SID4�; 7rg0� ¢6�:<; ��C�A+G
p = (m − 1) + nf�� G34RCK:<;>? i ADC5=B:NG�TBHr=�A+G3478*CP8$47:38*?<ID478zA+GB67A�A+G347ID4�6�ID467AOL�=B8EA
(m − 1) + n − 2ID4�;VHr=>CP:>AD8�CP:SA+G>CP8 ¥�IDCK; f�� G>?<8�¢�A+G34MID4F6�ID4F6�ARLF=B8+A
(m − 1) + n − 2 + 1 = m + n − 2ID4�;NH<=>CK:>A�8�CK:"A+G34�CP:BC@ADCP6M2r¥�IDCK; f��=B:��B47I�8-4�2�T ¢3JMT i =>25=>?<I�CK:<¥OID4M;�6M2@23A+G34RHr=>CP:>AD8zCK:�A+G34R�rI�8EA�ID=��'6M:<;"A+G34O�rI�8EAi =>2@?<LF:�4+ò i 47HBA�A+G34�Hr=>CP:>Az� G>C i GFCP8�CP:�J<=�A+GNA+G34 �rI�8EA$ID=�� 6�:<;NA+G34��<I�8+A i =>2@?<LF:y¢� 4 ¥74\Az6 i =>25=>?<I�CK:<¥���C�A+GN4+òM6 i AD2 T
m + n − 2ID4M;NH<=>CK:>A�8$6M:<;N:<=�ID4M; 7rg0�yf� G347ID47ku=BID4$A+G34OLN6\òMCKL�?<L :B?<L�J34MI�=>k<ID4M;�H<=>CK:>A�8�CK8
m+n−2¢�� G>C i G 4M:<;B8A+G34�CK:<;>? i ADC5=B:N6M:<;"A+G34aH3ID=3=>k f
í f�� CP:<;N672P2r89=>2P?BADCK=B:38�CK:NH<=B8*C�ADC��B4OCK:>AD4�¥747I�8a¢b¢cAE= A+G34 4��>?<67ADCK=B:
a!b! = a! + b! + c!
��� å(¯Mã�� ��� ° � ��X±�±�ã � � Mé*é*ç@å � � êuä�Mé�� � ��ä ��� ��ä��è â+ã � � � � � ���è � ��è ��¬ � ä �<ã � ���ä��è â+ã � �è�� ª ç�ã�äEä+ã ¬ � äEèBé �\ê�ã_çKè�� ° 7çPé � èBé3³/¸� � ê�ê�ã � ��ä MèyâEãOµ �"ã �7ç(¯Mã ê� ãé � å��3êKç � è ��� � 7é9é+çPå ¨µ
� ka 6= b
¢�A+G347:V��C�A+G3=>?BA�2K=B898�=>k�¥747:<4MI�672PC�A�T ¢a > b
f�� G34M:a!;3=34M8 :<=�A;BC �BCK;<4
b!f � 4M: i 4B¢
c! = a!b! − a! − b!CK8�:<=�Az;BC �BCP8*CKJB2K4aJMT
a!f�� G34M:
a > c¢>6�:<;
���M�
a!b! = a! + b! + c! < 2a! + b!¢ � G>C i G�CPLFHB2PCK4M8XA+GB6�A
(a! − 1)(b! − 2) < 2f
� AzCP8$4M6M8�T�AE= i G34 i*¤ A+GB6�A�A+G>CK8$¥\C �B4M8�:<=�8-=>2@?BADC5=B:38 f� G347ID47ku=BID4>¢M� 4XLN?<8EA�GB6\�B4a = b
f�£ ?<I�4��>?<67ADCK=B:�J34 i =BL�478a!2 = 2a!+ c! `G34M: i 4
a! | c!6M:<;�A+G>?<8
a < cf ��IDC�AE4
c = a + k� G347ID4
k > 0CK8X6�:QCP:>AE4M¥74MI fÙ C��>CK8+C5=B:�JMT
a!:<=��hTBCK472K;38
a! = 2 + (a + 1)(a + 2) · · · (a + k)f�� G347:
a! > 2¢� G>C i G"CKLNH32@C5478zA+GB6�A
a > 26M:<;
3 | a!f�� 47: i 4>¢�� 4�L�?<8+A�GB6\�B4
(a + 1)(a + 2) · · · (a + k) ≡ 1 (mod 3)f
� G347:k < 3
ßu=�A+G347Iæ��CP8-4(a + 1)(a + 2) · · · (a + k)
CP8�;>C��>CK8+C5J>254RJMT3à f�� k
k = 1¢� 4"¥74�A
a! = a + 3¢3� G>C i G�TBCK472K;38
a = 3 ` A+G347: (a, b, c) = (3, 3, 4)f�� k
k = 2¢� 4�¥74�A
a! = a2 + 3a + 4¢>� G>C i GNCPLFHB2PCK4M8�A+GB67A
a | 4 ` G347: i 4>¢ a = 1¢a = 2
¢r=BIa = 4
f�� A�CK8$476�8�T�AD= i G34 i*¤ A+GB67A�A+G3478-4 i 6M8-478�k56MC@2 f� G>?<8\¢>A+G34a=B:B2�T�89=>2P?BADCK=B:�CP8(a, b, c) = (3, 3, 4)
f
� =�� � 4�2K=3= ¤ 6�AO89=>2P?BADCK=B:38Ok5ID=BL¾=>?<IXID4M6�;<47I�8RAD= 7 =>?<:<;��F=>k�A+G34S�rI�C@ADCP8-G�w67A+G347LF6�ADC i 6M2 £ 2�TBLFHBCK6�;��M����� ����� � ¥\C��B47:F6�A��D�M�����FìB� ��� � � � � fØ f � =BIO4M6 i GSCP:>AE4M¥74MIn > 1
¢0254\Ap(n)
;34M:<=�AD4�A+G34N2K6MID¥74M8EAOH<I�CKLF4Nk56 i AD=BIR=>knfÙ 4�AD4MIDLNCP:<4a6M2@23AEIDCPH32K4M8
x¢y¢z=>k�;>CK8EADCK: i A�Hr=B8+C@ADC �B4RCK:>AD4�¥747I�8$8*67ADCP8*k@T>CK:<¥
ßPC�àx¢y¢z6�ID4RCK:N6MIDC�A+GBL�4\ADC i H<ID=3¥�ID47898+C5=B:y¢B6M:<;
ßKC@C�àp(xyz) ≤ 3
f��� å(¯Mã�� � � ª ç�ã\äEä*ã�¬ � äEèBé �\ê�ã_çKè�� ° 7çPé � èBé3³/¸� � ê�ê�ã ����ä MèyâEãOµ
¡M4�Ax¢y¢y6�:<;
zJ<4N;BCP8+ADCP: i AXH<=B8*C�ADC��B4�CK:>AD4�¥747I�8R896�ADCK8+k@TBCP:<¥�ßPC�à�6M:<;VßPCPC à f �S4;<4M;B? i 4Rk5ID=BL°ßKC@C�àyA+GB6�A
x = 2a × 3b ¢ y = 2c × 3d ¢>6M:<; z = 2e × 3f � G347ID4 a¢b¢
c¢d¢e¢B6�:<;
f6�ID4�:<=B:<�*:<4M¥�67ADC �B4�CP:>AE4M¥74MI�8 f �QC�A+G3=>?BA�2K=B898�=>k�¥747:<4MI�672PC�A�T ¢�� 4�LN6�T6�8*8*?<LF4RA+GB6�A
x < y < zf�� G347:�ßPC�à0CK8$4M�B?3C �>6M2K4M:>A�AE=
x + z = 2yf ß � à
¡M4�Aδ = gcd(x, y, z)
f�� =�AD4RA+GB6�A (x
δ,
y
δ,
z
δ
) 8*67ADCP8*�r4M8�ß � à�6M:<;
p(
x
δ× y
δ× z
δ
)
≤ p(xyz) ≤ 3f
� G>?<8\¢ (x
δ,
y
δ,
z
δ
) CP8"6S8-=>2@?BADC5=B: f ��=BID4�=7�B4MI9¢(mx, my, mz)
CP8"6S8-=>2@?BADC5=B:�ku=BI4M6 i G
m = 2p × 3q ¢�� G34MID4 p6M:<;
q6MID4 :<=B:<�+:<4�¥�6�ADC��B4aCP:>AE4M¥74MI�8 f�� G347ID47ku=BID4>¢>� 4LF6\TN6M898+?<L�4OA+GB67A
δ = 1f�� G347:
ace = 0 = bdff
� ID=BL¿ß � à+¢�� 4a;<4M;B? i 4�A+GB6�Ax6M:<;
zGB6\�B4RA+G34�896ML�4�H<6MIDC�A�T f
trôMö�ï � fx6M:<;
z6MID4 =3;3; f� G347:Qß � à�ID4�;>? i 478�AD=
3b + 3f = 2c+1 × 3d ¢���C�A+G f > bß58+CK: i 4
x < zà f � k
b > 0¢7A+G347:�A+G34$254�kPA08*CK;<4�=>k�A+G>CK8�4��>?<67ADCK=B:aCP8�;>C��>CK8+C5J>254�JMT
3¢\� G>C i GRku=BI i 4M8
d > 0f
��� �
� G347:δ ≥ 3
¢0� G>C i G i =B:>AEI�6�;BC i AD8"=>?<I�6M898+?<LFH>ADC5=B:VA+GB6�Aδ = 1
f�� G>?<8b = 0
¢k5ID=BL � G>C i GF� 4F;34�;>? i 4"A+GB67Ad = 0
f�� AXku=>2@25=��a8�A+GB67AOß � à�LF6\TVJ<4NID4_�aIDC�A�AE47:V6M82c+1 − 3f = 1
f �<?BA�C@A�CK8�� 4�2P2K� ¤ :<=��a:FßK8-4M4 � ��� à0A+GB6�A�A+G34 =B:B2 T�CP:>AE4M¥74MI�8-=>2@?BADC5=B:=>k2m − 3n = 1
CP8(m, n) = (2, 1)
f�� G>CK8�2K4M6�;38zAE=(x, y, z) = (1, 2, 3)
ftrôMö�ï�� f
x6M:<;
z6MID4 4-�B47: f� G347:
yL�?<8+A�J34�=3;3;Q6M:<;
d ≥ 1ßu=�A+G347Iæ��CP8-4
1 = y > xà f � ID=BL¶ß � à+¢3� 4;<4M;B? i 4�A+GB6�A
b = f = 0fO� G>?<8\¢yß � àzID4�;>? i 478�AE=
2a + 2e = 2 × 3df � =�AD4 A+GB6�A
z > y ≥ 3¢389=�A+GB6�A
e ≥ 2f�� CK: i 4RA+G34aI�C5¥7G�Az8+C5;34 =>kyß � à�CK8$;>C��>CK8+C5J>254aJMT
2JB?BAz:<=�AJMT
4¢�A+G>CP8�ku=BI i 478
a = 1f�� G347:�ß � à�CP8
3d − 2e−1 = 1f �<?BA�C@A�CK8�� 4�2P2 ¤ :<=��a:Fß5894�4
� � � à�A+GB67A�A+G34�=B:B2�T�CP:>AE4M¥74MI$89=>2P?BADCK=B:38R=>k3m − 2n = 1
6MID4(m, n) = (1, 1)
=BI(m, n) = (2, 3)
f�� G>CK8�2K4M6�;38zAE=(x, y, z) = (2, 3, 4)
=BI(x, y, z) = (2, 9, 16)
fg�i+i =BID;BCP:<¥zAE=XA+G34�CK:BC�ADCK672�ID47LF6MI ¤ ¢�A+G34�;<478*CPID4�;OAEI�CKHB25478�6MID4�A+G3=B894z� G>C i GaGB6\�B4=B:<4 =>krA+G34Rku=>2P2K=���CK:<¥Xku=BIELN8$ßu=BI�A+G347CPIzH<4MIDLN?BA�67ADCK=B:38Eà+ì(2p × 3q, 2p+1 × 3q, 2p × 3q+1)
¢(2p+1 × 3q, 2p × 3q+2, 2p+2 × 3q)
¢(2p+1 × 3q, 2p × 3q+2, 2p+4 × 31)
¢� G34MID4
p6�:<;
q6MID4a:<=B:<�+:<4�¥�6�ADC��B4�CP:>AE4M¥74MI�8 f
� ï_óæï �*ï�î �_ï7ö� � � � f � CK4MIDH3CP:38 ¤ C�¢ �\� � �QH3ID=3JB2DÝ4MLF4M8 ;<4NA+G0�4M=BIDCK4w�4�2D�47L�47:>AD67CKID4�;<478 :<=BLFJ3ID478 �M¢H<J f � � � ��� 4\AzHrJ f � � � ��� f¯ f ¡M4\A
ABCJ<4z6zAEIDCP6�:<¥\2K4B¢\6�:<;X2K4�A
DJ<4�6�Hr=>CP:>Ay=B:
AB8+? i G�A+GB6�A
4AD = ABf� G34"GB6M2@ku�+2@CK:<4
`CP8O;BI�6��a:�=B:NA+G34"8*6�LF4�8+C5;34"=>k
AB6�8
C¢<8+A�6�IæADCK:<¥ak5ID=BL
D6M:<;LF6 ¤ CP:<¥F6�:�6�:<¥\2K4Q=>k
�C�A+G
DA¢�� G34MID4
θ = ∠ACBf�� k�A+G34 i CKI i ?<L i CKI i 2K4Q=>k
ABCL�4M4�A�8zA+G34 GB6M2@ku�+2@CK:<4
`6�A
P¢>8-G3=���A+GB6�A
PB = 2PDf
��� å(¯Mã�� ��� ° ç�â �yã-å�¬ Bê�çPå@å�ã ��� � �Bã\è�� ��ä MèyâEã����è�� ��ã ��� ä+ã ���oµ ��Mè � �åPå � � X± �<ã\è���1² ��® � �oµ �"ã���ç$¯Mã`¬ 3ê 7ç@åPå�ã�· é$é � å �BêKç � è1µ
¡M4�AQJ34�A+G34w8-4 i =B:<;nH<=>CK:>AF=>kOCK:>AD4MI�894 i ADCK=B:h=>kXA+G34�2@CK:<4
DP��C�A+G�A+G34i CKI i ?<L i CKI i 2K4 ß5894�4R�r¥\?<ID4\à f�� G347:
∠ADQ = ∠BDP = π − ∠ADP = π − ∠ACB = ∠AQB6�:<;∠QAD = ∠BAQ
f¿� G34MID4�ku=BID4B¢4ADQ
6M:<; 4AQB6�ID4 8+CKL�CP2P6�I f
� G347: AD
AQ=
AQ
AB
f � CP: i 4AB = 4AD
¢C@ASku=>2@25=��a8SA+GB67A
AB = 2AQf �<?BA
4PDB6�:<; 4AQB
6MID4O6M2P8-=a8*CPLNC@2K6MI-¢8*CP: i 4∠BDP = ∠AQB
ßPk5ID=BL 6�J3=M�B4_à6�:<;∠DPB = ∠QPB = ∠QAB
f� ID=BL�A+G>CP8�8*CPLNC@2K6MIDC�A�T 6M:<; A+G34°ID4�2K6��ADC5=B:
AB = 2AQ¢�� 4 i =B: i 2@?r;<4QA+GB6�A
PB = 2PDf
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A
B C
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`
�����
á f ¡M4�Af : � → �
J<4�6 H<4MIDLN?BA�67ADCK=B:�=>k<A+G34a894�A�=>k 6M2@2rHr=B8+C@ADC �B4RCK:>AD4�¥747I�8 f
ßK6�à � G3=�� A+GB67A�A+G347ID4"CP8O6�:�6�I�C@A+GBLF4�ADC i H3ID=3¥�ID4M8*8*CK=B:a¢a + d
¢a + 2d
¢<� G347ID4d > 0
¢38+? i G�A+GB67Af(a) < f(a + d) < f(a + 2d)
fßuJ�à���?<8+A A+G347ID4XJ34$6�:�6MIDC�A+GBL�4\ADC i H<ID=3¥�ID47898+C5=B:
a¢a+d
¢. . .¢a+2003d
¢\� G347ID4d > 0
¢38+? i G�A+GB67Af(a) < f(a + d) < · · · < f(a + 2003d) �
� g Hr47IEL�?BAD6�ADC5=B:S=>k�CK8R6N=B:<4��DAE=3�*=B:<4"kK?<: i ADC5=B:F� G3=B8-4"CPLF6�¥74"CP8XA+G34 � G3=>254�=>k
�a` A+GB67AzCK8\¢<6akK?<: i ADC5=B:Fk5ID=BL � AE= � 8*? i G"A+GB67Azku=BI�6M2@2 m ∈ � A+G347ID4aCK8$6 ?<:BCK�B?r4n ∈ � 8*? i G�A+GB67A f(n) = m
f ���� å(¯Mã�� � � ª ç�ã�äEä+ã=¬ � äEèBé �\ê�ã_çKè�� ° �çKé � è3é�³R¸� � ê�ê�ã � ��ä��è â+ã ���è�� ¸�ç � � � � � ª � å � � ±�± ��è>çæê � � � å@å�ã �Bã ���RçKè�ê�ã�ä � O¯Mã�è ���¨¸ ��® � �oµ �"ã��7ç(¯Mã�� � � ��· éo$ä�ç�ê�ãX³ � ��µ
ß56\à�¡M4�Aa = f−1(1)
6M:<;m = f(a+1)
f�� G347:m ≥ 2
f �BTRA+G34$H3CK¥74�=B:<G3=>2K4H<I�CK: i CPH32K4B¢�A+G34�894��>?r4M: i 4 {f(a+2i)}m−1i=0
i 6M:3:<=�A�J<4�LF=B:<=�AE=B:BC i 672P2 Ta;34 i ID476�8+CK:<¥ f� 47: i 4>¢�A+G34MID4$4*òMCK8EAD8
k��C�A+G
0 ≤ k ≤ m−28*? i GXA+GB67A
f(a+2k) < f(a+2k+1)f¡M4�A
d = 2k f�� G347: f(a) < f(a + d) < f(a + 2d)f
ßuJ�à � = f � :�k56 i A-¢�A+G34MID4�;3=34M8N:<=�A�:<4 i 47898*6�I�CP2 T�4*òMCK8EA"8*? i GÉ6�:�6�I�C@A+GBLF4�ADC iH<ID=3¥�ID47898+C5=B:�=>k�2547:<¥_A+G4f�Ù 4��r:<4
f(n) = 4(3i) − n − 1C@k
3i ≤ n < 3i+1f� G347:
fCP8�;<4 i ID4M6M8*CP:<¥X=B:�A+G34�CP:>AE47I��>6M2
[3i, 3i+1)ku=BI06�:�T�CK:>AD4�¥747I
i ≥ 0f � ?<H3Hr=B894A+GB67A
f(a) < f(a + d) < f(a + 2d) < f(a + 3d)ku=BI 89=BL�4
a¢
d ∈ � f� 47: i 4>¢3j ≤ a < 3j+1 ¢ 3k ≤ a + d < 3k+1 ¢ 3l ≤ a + 2d < 3l+1 ¢�6M:<;
3m ≤ a + 3d < 3m+1 ¢���C@A+G 0 ≤ j < k < l < mf�� G34MID4�ku=BID4B¢
2d = (a + 3d) − (a + d) > 3m − 3k+1 ≥ 3k+2 − 3k+1 = 2(3k+1)f
� G>?<8\¢d > 3k+1 ¢�� G>C i G i =B:>AEI�6�;BC i AD8zA+G34�k56 i A�A+GB67A d < a + d < 3k+1 f
ë f ¡M4\AfJ34 6 kK?<: i ADCK=B:Fk5ID=BL°A+G34a8-4\A�=>k�:<=B:<�*:<4M¥�67ADC �B4aCK:>AD4�¥747I�8$CK:>AD=�C@A�8-4�2Pky8*? i GA+GB67A-¢>ku=BI�6M2@2
n ≥ 0¢
ßPC�à (f(2n + 1)
)2 −(
f(2n))2
= 6f(n) + 1¢B6M:<;
ßKC@C�àf(2n) ≥ f(n)
f� =�� LN6�:�T�:B?<L�J34MI�8�2K4M8*8zA+GB6�:
20036MID4RA+G347ID4�CK:"A+G34RCKLN6�¥74a=>k
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� CK: i 46f(n)+1
CP8z=3;3;y¢�J<=�A+Gf(2n+1)−f(2n)
6M:<;f(2n+1)+f(2n)LN?<8EA�J<4 =3;3;y¢3JMTNßKC à f�� k
f(2n + 1) − f(2n) ≥ 3¢>A+G347:
f(2n + 1) + f(2n) ≤ 13
(
6f(n) + 1)
= 2f(n) + 136�:<;
2f(2n) =(
f(2n+1)+f(2n))
−(
f(2n+1)−f(2n))
≤ 2f(2n)+ 13
−3¢
��� �
� G>C i GOCP8�6 i =B:>AEI�6�;>C i ADCK=B: f�� G347ID47ku=BID4>¢f(2n+1)−f(2n) = 1
¢76�:<;�ßKC à<ID4�;>? i 4780AD=f(2n+1)+f(2n) = 6f(n)+1
f�� =>2��>CK:<¥�A+G34X8�T38EAE47LS¢�� 4R¥74\Af(2n) = 3f(n)6�:<;
f(2n + 1) = 3f(n) + 1ku=BI�6M2@2
n ≥ 0f� =���� 4�89G3=���¢rJMTFCP:<;B? i ADCK=B:Q=B:
n¢BA+GB67A�C@kyA+G34�J36M8-4 2 ID4MH3ID4M894M:>A�67ADCK=B:Q=>k
nCP8
ak2k + · · · + a12 + a0
¢�A+G34M:f(n) = ak3
k + · · · + a13 + a0f � CK: i 4
f(0) = 0¢<A+G34 i 2P6MCPL CK8�AEID?r4 ku=BI
n = 0f�g 898+?<L�4aA+GB6�A
n ≥ 16�:<;NA+G34 i 2K67CKL CP8AEID?r4�?<H�AD=
n − 1f ��I�C@AD4
n = ak2k + · · · + a12 + a0
f�� G347:f(n) = f(2(ak2k−1 + · · · + a1) + a0)
= 3f(ak2k−1 + · · · + a1) + a0 = ak3k + · · · + a13 + a0
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37 > 2003¢C@A�ku=>2P2K=��a80A+GB6�A
36+ · · ·+3+1 = 1093CP8�A+G34$2P6�ID¥7478+A0:B?<L�J34MI�25478980A+GB6�:
2003CP:A+G34aCPLF6�¥74 =>k
ff�� =�A+G34MID4a6�ID4
27 = 128:B?<LFJ<47I�8$2547898zA+GB6�:
2003CP:�A+G34�CKLN6�¥74=>k
ff
� 4+òMA�� 4�AD?<IE:NAD=N8-=>2@?BADC5=B:38�k5ID=BL =>?<I�ID4M6�;<47I�8$AD=NH<ID=3J>2547LF8X=>k A+G34��y67Þ+6 ¤ G� 6�ADC5=B:3672��w6�A+G34MLN67ADC i 672 £ 2�TBLFHBCK6�;��M�������9����� � ¥\C��B47:NCP: �D�M�����FìB� � � � � � � f¯ f ß � µ ° �� ���è �3ã�ê 7å@ç�ã3¯ à g :<¥\25478B6M:<;
C=>k0AEI�CK6M:<¥\254
ABC6�ID4"6 i ?BAE4 f � C5;34
KN=>k�ID4 i A�6�:<¥\2K4
KLMNJ<4�25=B:<¥�8�AE=N894�¥�LF4M:>A
BC¢3H<=>CK:>A�8
L6M:<;
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AB6M:<;
AC¢0ID4M8*Hr4 i ADC��B4�2�T f ¡M4�A
OJ34�A+G34NCP:>AE47I�8-4 i ADC5=B:SHr=>CP:>AR=>kA+G34�;>CK6�¥7=B:36M2P8�=>k
KLMNf ¡M4\A
C1J34�A+G34�CP:>AE47I�8-4 i ADC5=B:NHr=>CP:>A�=>k 2PCP:<4M8
BO6M:<;
MN¢<6M:<;N254\A
B1J<4�A+G34�CK:>AD4MI�894 i ADCK=B:�H<=>CK:>A�=>ky2@CK:<478
CO6M:<;
LKf 1<ID=M�B4�A+GB6�A2PCP:<4M8
AO¢BB1
¢B6M:<;CC1
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................................................................................................................................................................................................................................................................................................................................................
A
B
B1
B2
C
C1
K
L M
N
O
P�
r s t
p
qu ���*
v
u + v
¡M4�A�2@CK:<4BB1
LF4�4\ALN
6�:<;OA
67AP6M:<;
B2¢�ID4M8*Hr4 i ADC��B4�2�T f ¡M4\A
C2ß5:<=�A8-G3=��a:�CP:"A+G34a;BCP6�¥�I�6ML"à�J<4OA+G34�Hr=>CP:>A�=>k CP:>AE47I�8-4 i ADC5=B:N=>k 2@CK:<4
CC16M:<;
OAf �S4?<8-4aA+G34�ku=>2@25=���CP:<¥a:<=�AD6�ADC5=B:�ì
AL = p¢LB = q ` BK = r
¢KN = LM = s
¢NC = t ` LP = u
¢PO = v
f
��� �
� CK: i 4 4ALM ∼ 4ABC¢0� 4QGB6��B4 p
s=
p + q
r + s + t=
q
r + t` A+GB67ARCP8�¢
p
q=
s
r + t
f� =�� � 4w6�H3H32 T'��47:<472P6M?<8\§ � G34�=BID47L AD=�A+G34�AEIDCP6�:<¥\2K4��DAEI�6�:38��B47I�89672OH<67CKI�8
(4LKN ; B1C)6M:<;
(4LKN ; PB)AD=N¥74�A
LO
ON· t
s + t=
LB1
B1K=
u
u + 2v· r + s
r
f��=B:3894��>?r4M:>AD2 Ty¢ u + 2v
u=
r + s
r· s + t
t` A+GB6�A�CK8\¢
v
u=
1
2
(
(r + s)(s + t)
rt− 1
)
=s(r + s + t)
2rt
fg H<HB2�T>CK:<¥���4M:<4�2K67?<8�§ � G34�=BID47L AD=�A+G34aH36MCPI
(4OAL; B2B)¢�� 4a=3J>A�6MCP:
OB2
B2A=
v
u· q
p + q=
s(r + s + t)
2rt· r + t
r + s + t=
s(r + t)
2rt
f�BTF8�T3LNL�4\AEI�Ty¢
C2;BC �BCK;<478
OACP:NA+G34 896ML�4aI�67ADCK= ` A+GB67AzCK8\¢BA+G34 Hr=>CP:>AD8 B26�:<;
C2i =>CP: i C5;34 f�� G>?<8�¢
AO¢BB1
¢B6M:<;CC1
i =B: i ?<Iz6�AB2 (= C2)
fá f ß ®6µ ° � 7é � ã3¯ à � CK:<;�A+G34XLN6\òMCKLN6M2>6M:<;�L�CK:BCPLF672��>672P?r478z=>k>A+G34X8+?<L
a+b+cCPka2 + b2 ≤ c ≤ 1
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� G34aLN6\òMCKLN6M2>�>6M2@?r4�CP81 +
√26�:<;�A+G34aL�CK:BCPLF6723�>672P?r4RCK8 −1
2
f� ?<H<H<=B8-4�A+GB6�A
a2+b2 ≤ c ≤ 1¢�6�:<;X2K4�A
r =√
a2 + b2fy� G347:
0 ≤ r ≤ √c6�:<;
a = r cos θ¢b = r sin θ
¢>ku=BI�8-=BLF4�ID4M672 :B?<LFJ<47Iθf� A�ku=>2@25=��a8�A+GB67A
a + b = r(cos θ + sin θ) = r√
2 sin
(
π
4+ θ
) f� CK: i 4 −1 ≤ sin
(
π4
+ θ)
≤ 16M:<;
r ≥ 0¢r� 4NGB6��B4 −r
√2 ≤ a + b ≤ r
√2f� G347:
a + b + c ≤ c + r√
2 ≤ 1 +√
2¢
8*CP: i 4c ≤ 1
6M:<;r ≤ √
c ≤ 1f�g 2K89= ¢
a + b + c ≥ c − r√
2 ≥ c −√
2√
c =
(√c − 1√
2
)2
− 1
2≥ −1
2
f� G>?<8\¢ −1
2≤ a + b + c ≤ 1 +
√2f��=BID4�=7�B4MI9¢ CPk�� 4 A�6 ¤ 4
a = b = 1√2
6�:<;c = 1
¢rA+G347:a2 + b2 ≤ c ≤ 16�:<;
a + b + c = 1 +√
2¢ � G>C@254 ��C@A+G
a = b = −12
6M:<;c = 1
2
¢r� 4F=3J>A�6MCP:a2 + b2 ≤ c ≤ 1
6�:<;a + b + c = −1
2
f�� G34aH3ID=3=>k CK8 i =BLFHB254\AE4 f
��� �
ë f ß ®�µ ° � 7é � ã3¯ à�¡M4�AyAæ� =�894��>?r4M: i 4M8�=>kBID4M672>:B?<LFJ<47I�8 {an} 6�:<; {bn} J34�8*? i GA+GB67Aa0 = b0 = 0
6M:<;�ku=BIz4M6 i G�Hr=B8+C@ADC �B4RCK:>AD4�¥747In¢
an = a2n−1 + 3
6M:<;bn = b2
n−1 + 2n f��=BLNH<6MID4RA+G34a:B?<LFJ<47I�8
a20036M:<;
b2003f
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n ≥ 1¢r� 4FGB6\�B4
a2n > 22n f�� G>CP8Oku=>2P2K=��a8�JMTQCK:<;>? i ADC5=B:V=B:
n¢�8*CP: i 4
a1 = 36M:<;
an > a2n−1
ku=BIn ≥ 1
fÉg :<=�A+G34MI�476�8�TwCP:<;B? i ADCK=B:É89G3=��a8�A+GB6�A2n > n + 3
ku=BIn ≥ 3
f�� G>?<8�¢>ku=BIn ≥ 3
¢�� 4 GB6\�B4a2
n > 22n
> 2n+3 f ß � à�S4 i 2K67CKL A+GB67A
2bn < anku=BIX672P2
n ≥ 3f�� G34 i 2P6MCPLÂCP8OAEID?r4�ku=BI
n = 3¢8*CP: i 4
a3 = 1476�:<;
b3 = 72f 1<ID= i 4M4�;>CK:<¥�JMTFCK:<;>? i ADC5=B:y¢B� 4�6�8*8*?<LF4aA+GB67A�A+G34i 2K67CKLÂG3=>2K;38�ku=BI$8-=BLF4�¥\C �B4M:
n ≥ 3faÚ 8+CK:<¥�A+G34"CP:<;B? i ADCK=B:SG�TBHr=�A+G3478*CP8O6�:<;�ß � à+¢� 4 =3J�AD67CK:
2bn+1 = 2(
b2n + 2n+1
)
= 12
(
(2bn)2 + 2n+3)
< 12
(
a2n + a2
n
)
< a2n + 3 = an+1
¢� G>C i GN4M:<;B8�A+G34RCK:<;>? i ADC5=B: f�BT�?<8+CK:<¥�A+G34 i 2P6MCPL 6M:<; i G34 i*¤ CK:<¥�A+G34S�rI�8EA ku4\� i 6�894M8\¢�� 4V;<4M;B? i 4SA+GB6�Abn ≤ an
ku=BIR672P2n ≥ 0
¢���C�A+G�4��>?<6M2@C@A�TVC@kz6�:<;�=B:B2 TVC@kn = 0
f�� :�H36�IæADC i ?32P6�I9¢a2003 > b2003
f
� = i =BLNH32K4�AD4OA+G>CK8�:B?<LFJ<47I-¢�� 4R2K=3= ¤ 6�A�ID4M6�;<47I�8�§�8-=>2@?BADC5=B:38�AE="H3ID=3JB2K4MLN8$=>kA+G34 Ú�¤ I�67CK:BCP6�:��w6�A+G34MLN67ADC i 672 £ 2 T3LNH3CP6�; ������� � =BIDL¿¥\C��B47:NCP: �D�M�����FìB� � � � ����� fØ f � CK:<;�6M2@2�ID476M2k8*? i GNA+GB6�A�A+G34�ku=>2@25=���CP:<¥a8�T38EAE47L¶=>k�4M�B?<6�ADC5=B:38OGB6�8X6�?<:BCK�B?r48-=>2@?BADC5=B:�ì
x2 + y2 = 2k2 ¢kx − y = 2k
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kx − y = 2kCK8�A�6�:<¥747:>A�AE=NA+G34 i CKI i 2K4
�C@A+GQ4M�B?<6�ADC5=B:
x2 + y2 = 2k2 fR� G>CK8i =B:<;>C@ADCK=B: i 6M:aJ<4�8+A�67AD4�;�4��>?3C��>672547:>AD2�TR6M80ku=>2P2K=��a87ìBA+G34�I�6�;>CP?<8 √2|k| =>k γ CP8�4��>?<6M2AE=OA+G34X;>CK8EAD6M: i 4$k5ID=BL
`AE=OA+G34�=BIDCK¥\CK:y¢\� G>C i GRCP8 |k · 0 − 0 − 2k|√
1 + k2
f�� G>?<8\¢�� 4�=3J>A�6MCP:A+G34�ku=>2P2K=���CK:<¥ i =B:<;BC�ADC5=B:F=B:
kì2k2 =
4k2
1 + k2
f� =>2��>CK:<¥Oku=BI
k¢�� 4R�r:<;�A+GB67A
k ∈ {0¢1¢ −1} f
���M�
¯ f 1<ID=7�B4XA+GB6�A�ku=BI�6M:�T AEIDCP6�:<¥\2K4B¢�CPkS;<47:<=�AE478zC�AD8z6�ID476�6M:<;
r;34M:<=�AD4M8�A+G34RI�6�;>CP?<8=>k C@A�8�CK:38 i IDCKJ<4M; i CPI i 254>¢�A+G34M:
S
r2≥ 3
√3f
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Ù 4M:<=�AD4FA+G34Q8+C5;34F2547:<¥_A+GB8"=>k�A+G34FAEI�CK6M:<¥\254QJMTa¢b¢�6�:<;
c6�:<;SA+G34Q8-47LNCK�Hr47IDCPL�4\AE47IaJMT
sfQg H3H32 TBCP:<¥�A+G34 g � 4�� � :<4M�B?<672PC�A�TSAE=�A+G34�Hr=B8+C@ADC �B4F:B?<L�J34MI�8
s − a¢s − b
¢36M:<;s − c
¢�� 4a=3J�AD67CK:3
√
(s − a)(s − b)(s − c) ≤ 13s ` A+GB6�A�CK8\¢
(s − a)(s − b)(s − c) ≤ s3
27
f ß � àÚ 8*CP:<¥ � 4MID=B:y§ 8 � =BIEL�?32K6N6M2K=B:<¥ ��C�A+GVß � à�6�:<;QA+G34 ¤ :<=��a:�ku=BIEL�?32K6
S = rs¢ � 4=3J>A�6MCP:
S2 = s(s − a)(s − b)(s − c) ≤ s4
27≤ S4
27r4
f� G347:y¢ S2
r4≥ 27
¢B6�:<;FG347: i 4>¢ S
r2≥ 3
√3f
ë f ¡M4\AαJ<4F6�ID4M672�:B?<LFJ<47IR8*? i G�A+GB6�AO�>�B4 i =B:3894 i ?BADC �B4�AE47IELN8 =>k�A+G34FCP:B�r:BC�AE48-4M�B?r47: i 4sin α
¢sin 2α
¢sin 3α
¢. . .¢sin nα
¢. . .
6�ID4"I�6�ADC5=B:3672 f 1<ID=M�B4 A+GB67A 7å@åA+G34RAE47IELN8$=>krA+G34a894��>?r4M: i 4a6�ID4�I�67ADCK=B:36M2 f��� å��3êKç � è ��� ª ç�ã�äEä+ã�¬ � äEè3é��\ê�ã-ç5è � ° �çKé � è3é�³R¸� � ê�ê�ã ����ä��è â+ã"µv�ï� � �ô f ¡M4�A
pJ34a6M:�CK:>AD4�¥747Iz8*67ADCP8*k@T>CK:<¥R6M:�TF=>k<A+G34�ku=>2P2K=���CK:<¥Xku=>?<I i =B:<;>C@ADCK=B:387ì
ßPC�àsin(pα) = sin
(
(p + 1)α)
= 0 `ßKC@C�àsin(pα) = sin
(
(p + 2)α)
= 0 `ßKC@CPC àcos(pα) = cos
(
(p + 1)α)
= 0 `ßKC ��àcos(pα) = cos
(
(p + 2)α)
= 0f
� G347:sin α ∈ {−1
¢0¢1} fª ä � ����f ßPC�à � ?<H<H<=B8-4�A+GB6�A
sin(pα) = sin(
(p + 1)α)
= 0fz� G347:
cos(pα) = ±16�:<;0 = sin
(
(p + 1)α)
= sin(pα) cos α + cos(pα) sin α = ± sin αf
� G>?<8\¢sin α = 0
fßKC@C�à � ?<H3Hr=B894 A+GB67A
sin(pα) = sin(
(p + 2)α)
= 0fR� G34M:
cos(pα) = ±16�:<;0 = sin
(
(p + 2)α)
= sin(pα) cos(2α) + cos(pα) sin(2α) = ± sin(2α)f
��� �
� G>?<8\¢sin(2α) = 0
¢�� G>C i G"CPLFHB2PCK4M8zA+GB6�Asin α ∈ {−1
¢0¢1} fßKC@CPC à�6M:<;FßPC���à�6�ID4 i =B:38+C5;34MID4M;�CP:N6 8+CKL�CP2P6�I��a6\T f
� ?<H<H<=B8-4sin(pα)
CK8XI�6�ADC5=B:3672yku=BIp ∈ {n
¢n + 1
¢n + 2
¢n + 3
¢n + 4} ¢ku=BIz89=BL�4RCP:>AE4M¥74MI
n > 0f
trôMö�ï � fR� G34MID4�4*òMCK8EAD8p ∈ {n + 1, n + 2, n + 3} 8+? i GFA+GB6�A sin(pα) 6= 0
6�:<;cos(
(p − 1)α)
6= 0f� G347:
cos α =sin(
(p − 1)α)
+ sin(
(p + 1)α)
2 sin(pα)CK8RI�6�ADC5=B:3672 f � CK: i 4cos(
(p − 1)α) i 6�:VJ34F4+ò�H3ID4M8*8-4M;�6�8R6NHr=>2 T3:<=BL�CK6720CP:
cos α��C@A+GwI�6�ADC5=B:3672 i =34�� i CK4M:>A�8�¢�C�Aaku=>2@25=��a8aA+GB67Acos(
(p − 1)α) CP8"I�67ADCK=B:36M2�ßK6�:<;wCP8:<=B:<�EÞ*47ID= ¢3JMTFG�T3H<=�A+G34M8+CK8Dà f�� G34MID4�ku=BID4B¢
sin α =sin(pα) − sin
(
(p − 1)α)
cos α
cos(
(p − 1)α)
CK8�I�6�ADC5=B:3672 f¡M4�AkJ<4�6�Hr=B8+C@ADC �B4 CP:>AE4M¥74MI f � CK: i 4
sin(kα)i 6�:�J34"4*ò�H<ID4789894�;�6M8X6�Hr=>2 T<�:<=BLNCP6M2<CK:
sin α��C�A+G�I�67ADCK=B:36M2 i =34�� i C547:>AD8\¢>C@A�ku=>2P2K=��a8zA+GB6�A
sin(kα)CK8�I�6�ADC5=B:3672 f
trôMö�ï � f � =BI 476 i Gp ∈ {n+1
¢n+2
¢n+3} ¢9� 4�GB6��B4 sin(pα) cos
(
(p−1)α)
= 0f� G347:y¢0JMTQA+G34�HBC5¥74M=B:<G3=>254�H3IDCP: i CKHB254>¢04�C@A+G347I
sin(pα) = 0ku=BI�Aæ� =N�>6M2@?r4M8=>k
p ∈ {n + 1¢n + 2
¢n + 3} =BI cos((p − 1)α
)
= 0ku=BI�Aæ� ="8*? i Ga�>672P?r478$=>k
pf
� :F47C�A+G34MI i 6�894B¢M� 4RLF6\T"?<8-4OA+G34O2547LFLN6RAE=�;34�;>? i 4OA+GB67Asin α ∈ {−1
¢0¢1} f� :H<6MI�ADC i ?32K6MI-¢
sin αCK8�I�6�ADC5=B:3672�¢>6�:<;"A+G34 i =B: i 2@?<8*CK=B:�ku=>2@25=��a8�6�8�CP:F�y6M8-4 � f
í f�Ù =34M8zA+G347ID4 4*òMCK8EA�6 :B?<LFJ<47Iq ∈ � 6�:<;N6aH<I�CKLF4a:B?<LFJ<47I p ∈ � 8*? i G�A+GB6�A
3p + 7p = 2 · 5q ���� å(¯Mã�� � � ° ç�â �yã-å�¬ Bê�çPå@å�ã � � � �Bã\è�� ��ä��è â+ã � �è�� ª ç�ã\äEä*ã�¬ � äEè3é��\ê�ã-ç5è � ° 7çPé � èBé3³¸� � ê�ê�ã ����ä MèyâEãOµ �"ã���ç$¯Mã`¬ 3ê 7ç@åPå�ã�· é~¯Mã\ä�é+ç � è1µ
� G347ID4�CK8�:<=�8+? i G�H<67CKI(p, q)
fg 898+?<L�4�8+? i G�:B?<L�J34MI�8p6�:<;
q4*òMCK8EA f�� G347:
p 6= 2¢r8*CP: i 4
32 + 72 = 58CK8�:<=�A�=>krA+G34Rku=BIEL2 · 5q
f�� G>?<8�¢pCP8$=3;<; f�� G347:
2 · 5q = 3p + 7p = (3 + 7) · A = 2 · 5 · A¢
� G34MID4A = 3p−1 − 3p−2 · 7 + 3p−3 · 72 − · · · − 3 · 7p−2 + 7p−1 f
� A�ku=>2@25=��a8RA+GB6�AA = 5q−1 ��C@A+G q > 1
ßK8*CP: i 4A > 1
à f � ?<I�A+G347IELF=BID4B¢�8*CP: i 43 ≡ −2 (mod 5)
6�:<;7 ≡ 2 (mod 5)
¢�� 4aGB6��B4A ≡ 2p−1 + 2p−1 + 2p−1 + · · · + 2p−1 ≡ p · 2p−1 (mod 5)
f
��� �
g 8X6�ID478*?32�A-¢p · 2p−1 ≡ 0 (mod 5)
¢ 6M:<;FA+G34�=B:B2 T�Hr=B8*8*CKJBC@2PC�A�TNCK8p = 5
f � CK: i 435 + 75 = 2 · 52 · 341
CP8�:<=�A�=>krA+G34�ku=BIDL2 · 5q ¢�A+G34�H<ID=3=>k CP8 i =BLNH32K4�AD4 f
² f�� CP:<;N672P2<kK?<: i ADCK=B:38f : � → �
8+? i G�A+GB67Af(
xf(x) + f(y))
= x2 + y
ku=BIz672P2x ∈ � 6M:<; y ∈ � f
��� å(¯Mã�� ��� ° ç�â �yã-å�¬ 3ê 7ç@åPå�ã � � � �>ã�è � ��ä MèyâEã�� ª ç�ã\äEä*ã ¬ � äEèBé �\ê�ã_çKè�� ° 7çPé � èBé3³¸� � ê�ê�ã ����ä��è â+ã � �è��G¸�ç � � � � � ª � å � � ±�± ��è>çæê � � � åPå�ã �>ã � �Rç5èyê�ã\ä � O¯Mã�è ���¨¸ �® � �oµ �"ã���ç$¯Mã�� � � ��· é�é � å��3êKç � è�µ
� AaCK8�476�8�T�AD=V�B47IDC@k@T�A+GB6�A�J<=�A+Gf(x) = x
6�:<;f(x) = −x
8*67ADCP8*k@T�A+G34kK?<: i ADC5=B:3672y4��>?<67ADCK=B: f �S4O��C@2P2<H<ID=7�B4RA+GB67A�A+G3478-4�6�ID4OA+G34 =B:B2 T�8-=>2@?BADC5=B:38 f¡M4�AfJ34�6�8-=>2@?BADC5=B: f � 4\A�ADCK:<¥
x = 0CP:�A+G34QkK?<: i ADC5=B:3672�4M�B?<6�ADC5=B:�¥\C �B4M8
f(
f(y))
= yku=BI�6M2@2
y ∈ � f � 4M: i 4B¢>ku=BI�6M2@2 x ¢ y ∈ � ¢x2 + y = f
(
xf(x) + f(y))
= f(
f(x)f(
f(x))
+ f(y))
= f(x)2 + yf
� G>?<8\¢f(x)2 = x2 ku=BIz672P2 x ∈ � f�� k f(1) = 1
¢>A+G347:1 + 2x + x2 = f(1 + x)2 = f
(
1f(1) + f(
f(x))
)2
=(
12 + f(x))2
= 1 + 2f(x) + x2 ¢6�:<;"A+G>?<8
f(x) = xku=BI�6M2@2
x ∈ � f�� CKL�CP2P6�I�2�T ¢>C@k f(1) = −1¢�A+G34M:
1 − 2x + x2 = f(−1 + x)2 = f(
1f(1) + f(
f(x))
)2
=(
12 + f(x))2
= 1 + 2f(x) + x2 ¢6�:<;"A+G>?<8
f(x) = −xku=BI�6M2@2
x ∈ � f
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� � �
� G34Vku=>2@25=���CP:<¥�A+GBID4�4�H3ID=3JB2K4MLN8F89G3=>?325;�¥\C��B4V8-=BLF4Sku4�4�2�ku=BI A+G34V8+A�TB2K4�=>kH<ID=3J>2547LF8$4M: i =>?<:>AE47ID4�;�CK:"A+G>CP8�J3=3= ¤ ìoM}Mð �+îBô3 Nï�îMõ � �98"�æðBî �@}�� 8�m�ð�õ+ði "î � � �������jv�ï��>ï�~ ��� �g IDCK¥7G�A+�*6M:<¥\254M;�AEI�CK6M:<¥\254aLN6�;34 =>k�H36�H<4MI�CK8�ku=>25;34�;N6725=B:<¥R6 8+AEI�67C5¥7G�A�2PCP:<4a8-=A+GB67ArA+G34z�B47I�AD4*òX6�A A+G34�IDCK¥7G�A�6�:<¥\2K4 i =>CK: i CK;<478���C�A+G�=B:<4$=>k�A+G34$=�A+G34MI<�B4MIæADC i 4M8=>krA+G34OAEIDCP6�:<¥\2K4a6M:<;N6 �B?<6�;3I�CP2P67AD4MI�672rCK8$=3J�AD67CK:<4M; f
ß56\à �SGB6�A�CP8NA+G34�I�67ADCK=�CP:>AE=w� G>C i GÉA+G34w;BCP6�¥7=B:3672K8�=>kXA+G>CP8Q�B?<6�;3I�CP2P67AD4MI�672;>C��>C5;34 476 i GN=�A+G347I � ß��aH<=>CK:>A�8EàßuJ�à � G>CK8R�>?<6�;BIDC@2K6�AE47I�6M2�CK8 i ?BA�6725=B:<¥aC@A�8X25=B:<¥7478+A�;>CK6�¥7=B:36M2 f � CK:<;FA+G34�6MID4M6=>k�A+G34Q8*LF672P2K4M8EARH3CK4 i 4�=>kzH<6MHr47IOA+GB67AOCK8�=3J�AD67CK:<4M;�C@k�A+G34Q6MID4M6�=>k�A+G34=BI�C5¥\CP:36M23AEI�CK6M:<¥\254RCK8
1f ß��aH<=>CK:>A�8Eà
oM}Mð �+îBô3 Nï�îMõ � �:8��7ï�î �P} � 8�m�ð�õ*ði �î �74:4 4����nv�ï��>ï�~ ���>�g L�=B:<¥a6�894�A$=>k2N
i =>CP:38�¢r6M2@2yC5;34M:>ADC i 672yCK:Q6MH<H<4M6MI�6�: i 4B¢2N − 2
6MID4"ID476M26�:<;26MID4�k56 ¤ 4 fyg :�TOAæ� =RID476M2 i =>CK:38�GB6��B4�A+G34$896ML�4�� 47CK¥7G�A f0� G34�k56 ¤ 4 i =>CK:38GB6��B4�A+G34R8*6�LF4�� 4�C5¥7G�A-¢7� G>C i G CK8�;>C���4MID47:>A�k5ID=BL A+G34�� 4�C5¥7G�A�=>kr6RID4M672 i =>CP: f
� =�� i 6M:�=B:<4 ;BC �BCK;<4RA+G34 i =>CK:38�CP:>AE="Aæ� =N¥�ID=>?<H<8�=>k04M�B?<672rAE=�A�6M23� 4�C5¥7G�A�JMT?<8*CP:<¥R6�JB6M2P6�: i 4a6�AzLF=B8+A4ADCKLF4M8\¢>C@k
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http://cartalk.com/content/puzzler/transcripts/200546/f
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P8+C
BD + DC = BE + ECf
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� =>C@Aa¢
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d = min{a¢b¢c¢d} f ��=B:>AEID47I��>?r4
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≥ 4d[
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� Ca¢b4�A
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a2(b + c − a)
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a + b≤ ab + bc + ca
2
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� =>C@Aa¢b4�A
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b2 + ca+
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c2 + ab≥ 6
f
� �M�
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ABC?<:�AEI�CK6M:<¥\254jCK89= i Ý472K4j6��B4 i
AB = AC4�AQAE4�2"�B?r4n2�§ 6M:<¥\254
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AB67?r�9;3472DÝ6S;<4
A4�A�AD472 �B?r4AD = BC
fB� ID=>?>�B47I�2�§ 6�:<¥\2K4ADC
ff f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f
áO¯Oá© f ª ä � � � é�ã � � � ° ç ��«�å��¬0ã�è â �_ã ��¬ ä�Mé � ¯ ��� � ±��è>ç f¡M4�A
nJ34a6aHr=B8+C@ADC �B4RCK:>AD4�¥747I f�� k
α = 1 +1
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e <
(
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(n!)2
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2n
< eα ¢áO¯ ë ± f ª ä � � � é�ã � � � ° ç ��«�å��¬0ã�è â �_ã ��¬ ä�Mé � ¯ ��� � ±��è>ç f
¡M4�AnJ34a6aHr=B8+C@ADC �B4RCK:>AD4�¥747I f 1<ID=M�B4OA+GB67A⌊√
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¡M4�Aa¢b¢cJ<4R6�:�T"ID4M672r:B?<LFJ<47I�8�8*? i G A+GB6�A
a2 + b2 + c2 = 9f 1<ID=7�B4OA+GB6�A
3 · min{a¢b¢c} ≤ 1 + abc
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¡M4�A A ={
z ∈ � ∗ :∣
∣
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z
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∣ ≤ 2} f ¡M4\A
n ≥ 2J34O6�: CP:>AE4M¥74MI f 1<ID=7�B4�A+GB6�A-¢
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¡M4�AABC
J<4Q6M:�CP8-=B8 i 4�25478�AEI�CK6M:<¥\254N��C�A+GAB = AC
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BP6�:<;
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D6M:<;
E¢BID4789H<4 i ADC �B472 T f�� CK:<;�A+G34�2K= i ?<8�=>k
PCPk
PD + DC = PE + EBf
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ABCJ<4Q6M:�CP8-=B8 i 4�25478�AEI�CK6M:<¥\254N��C�A+G
AB = AC¢�6M:<;�254\A
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D6M:<;
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PCPk
BD + DC = BE + ECf
� � �
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d = min{a¢b¢c¢d} f1<ID=M�B4OA+GB67A
a4 + b4 + c4 + d4 − 4abcd
≥ 4d[
(a − d)3 + (b − d)3 + (c − d)3 − 3(a − d)(b − d)(c − d)] f
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1f 1<ID=M�B4OA+GB67A
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� ka¢b¢B6�:<;
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a2(b + c − a)
b + c+
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c + a+
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a + b≤ ab + bc + ca
2
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(b + c)2
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b2 + ca+
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c2 + ab≥ 6
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¡M4�AABC
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6M:<;∠BAC = 100◦ f¡M4�A
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AB8+? i GSA+GB67A
AD = BCf � CP:<;
∠ADCf
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á Ø á � f �D�M�����Vì � �M� ¢ � � � � ª ä � � � é\ã�� ��� ª �7åE¬ ä�Bâ�Bã�è �`®0è>ç$¯Mã\ä�é+çæê � ��� ²Mã� Mé �� ��çKè � �Mä � ��²�����® � � f
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n=1JMTan+1 = n2/an
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1
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=
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1
πa1
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4
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ln(N) + O(1)f
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e
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(
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n
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n
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n
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1
n
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n
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[
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(
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n2
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a2
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(
1
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2
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1OM ′ + ∠M ′OC′2 = π � � \�^�c OM ′ ⊥ M ′
1M ′2 � V%S@^�aJL M ′
1M ′2
S@V
� �3�
AD6M:<¥74M:>A<AE=$A+G34 i CKI i 2K4z6�:<;OM ′ CP8�6�I�6�;>CP?<8Dà f � 4 i 67?<8-4 4M ′
1M ′O ∼ 4OM ′M ′2
¢C@A�ku=>2@25=��a8�A+GB67AM ′M ′2
1 · M ′M ′22 = M ′O4 f�� G34M:
(
M ′1O2 − M ′O2
)
·(
M ′2O2 − M ′O2
)
= a4 ¢((
x21 +
a2
b2y21
)
− a2
)
·((
x22 +
a2
b2y22
)
− a2
)
= a4 ¢(
x21
a2+
y21
b2− 1
)
·(
x22
a2+
y22
b2− 1
)
= 1f
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a1
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�. . .
�an N L n
cZSUV`M5SU^�a5M�T [ VJSAM5S e�L�]5L�\�RX^�f�� N L�]�V ��Y P�L�]5L n ≥ 2�
� [ ]i = 1
�2�. . .
�n� RUL?M
pi =∏
j 6=i
(aj − ai)�od P [�Y MJP�\?M n
∏
i=1
a1
pi
i < 1�
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�x1
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∑
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f(xi)
w′(xi)> 0
�Y P�L�]5L
w(x) =n∏
j=0
(x − xj)�
� SAS � f (n)(x) > 0g|[ ]o\�RAR
x ∈ I�
g f�^�a5M5S [ ^fVi\?M5SUV g ��S@^�_pMJP�Lb\ N [ e�L�a [ ^�cZSAM5S [ ^�V�S@V�Vi\�S>c�M [ N L (�=|"�032i=U7|- n ! 2`$�H6v�)#"<�� [ ] [ f�]pT�] [ N RUL�� �6Y L�M5\�$�L I = (0, ∞)
\�^�cf(x) = (−1)n ln x
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g|[ ]�\�R@Rx > 0
� W P�L�]5L g|[ ]5L �fS@V!VJM`]�S>a5M5R �
(n − 1) � a [ ^�e�L%� �&QV%S@^�_�MJP�LncZSUV`M5SU^�a5MO^�f�� N L�]�V a1
�a2
�. . .
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n∏
j=1
(x − aj)�'W P�L�^ g|[ ]hL�\�a%P
i = 1�2�. . .
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w′(ai) =∏
j 6=i
(ai − aj) = (−1)n−1pi
�
� ���
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i=1
f(ai)
w′(ai)> 0
f�� G34M:n∑
i=1
ln ai
pi
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i=1
(−1)n ln ai
(−1)n−1pi
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i=1
f(ai)
w′(ai)< 0
f
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i=1
a1
pi
i < 1f
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a�b� \�^�c
c N L�MJP�L�VJS>c�L�V [Zg \�Via`\�R>L�^�LuM`]�SU\�^�_�R>L ABC��� ] [ e�LuMJP�\?M
∑
� � �
(a + 1)bc(√
a −√
b)(√
a − √c) <
a4 + b4 + c4
abc
�
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S1 + S2
��Y P�L�]5LS1 =
∑
� � �
abc(√
a −√
b)
(√a − √
c)
�S2 =
∑
� � �
bc(√
a −√
b)
(√a − √
c)
�
� N ViL�]3e�LuMJP�\?M
S1 = abc ·
(√c −
√b)
+(√
a − √c)
+(√
b − √a)
(√c −
√b)
(√a − √
c)
(√b − √
a) = 0
�
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x2y2(y−x)+y2z2(z−y)+z2x2(x−z) = (x−y)(y−z)(z−x)(xy+yz+zx).
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x =√
a�y =
√b�
\�^�cz =
√c��Y L [ N M5\�SU^
S2 =√
ab +√
bc +√
ca�
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(√ab +
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√ca)
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� � �
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3
2 b3
2 c = (a4)3
8 (b4)3
8 (c4)1
4 < 38a4 + 3
8b4 + 1
4c4
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a3
2 bc3
2 < 38a4 + 1
4b4 + 3
8c4 6�:<; ab
3
2 c3
2 < 14a4 + 3
8b4 + 3
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a¢
b¢�6M:<;
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√ab +
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�|gxk > 0
g|[ ]k = 1
�2�. . .
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� \ � cos
nn∑
k=1
xk
− sin
nn∑
k=1
xk
≥ 1
n
n∑
k=1
(
cos1
xk
− sin1
xk
) �
�>N��n∑
k=1
sin1
xk
n∑
k=1
cos1
xk
≥ tan
nn∑
k=1
xk
�
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�x1 = 0.4
� \�^�cx2 = 0.3
� \�^�c��%\�^ [ f�V � a [ f�^ZM`L�]5L���\���T�R>L g|[ ]T�\�]�M �|N�� SUV n = 2�x1 = 1/π
� \�^�cx2 = 3/π
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K�L?Mf(x) = cos
1
x− sin
1
x
�O� ^�L � f�\�RASAM3� � \ � a5\�^�^ [�Y N L Y ]�SAM�M5L�^�\�V1
n
n∑
k=1
f(xk) ≤ f
(
1
n
n∑
k=1
xk
) �W PZS@V�S@V��iL�^�ViL�^ � V � ^�L � f�\�RASAM3� a%P�\�]�\�a5M5L�]�S��`S@^�_lMJP�Lya [ ^�a5\?eZSAM3� [Zg MJP�L g f�^�a5M5S [ ^
f�
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f ′′(x) =(1 − 2x) sin
1
x− (2x + 1) cos
1
xx4
< 0
ku=BIx ∈ (0.601451551, ∞)
f ß � G34a4M;BC�AE=BI0�B4MI�CP�r4�; �*6�:<=>?<8\§�ID478*?32�A�?<8*CP:<¥ �w6�HB254 f à� G>?<8\¢BCP:<4��>?<6M2@C@A�TFßK6�à�CP8zAEID?r4RCPkxk ∈ (0.601451551, ∞)
ku=BIk = 1
¢2¢. . .¢nf
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g(x) = sin1
x
6M:<;h(x) = cos
1
x
f�� G347:g′′(x) =
2
x3cos
1
x− 1
x4sin
1
x
6�:<;h′′(x) = −
(
2
x3sin
1
x+
1
x4cos
1
x
) f� =BI
x ∈ (0.928613759, ∞)¢�� 4QGB6\�B4
g′′(x) > 06M:<;
h′′(x) < 0f � :�k56 i A-¢
h′′(x) < 0CPk
x ∈ (0.436885409, ∞)f�� CK: i 4
0.928613759 > 2/π¢�� 4 GB6\�B4
0 <
nn∑
k=1
xk<
π
2
6�:<;0 <
1
xk
<π
2
f� =���¢ �947:38-47:y§ 8 � :<4��>?<6M2@C@A�TN6�H3H32@C54M;"AE= A+G34�kK?<: i ADCK=B:38
g(x)6�:<;
h(x)T>C54�25;B8
1
n
n∑
k=1
sin1
xk≥ sin
nn∑
k=1
xk
> 0
6M:<;0 <
1
n
n∑
k=1
cos1
xk≤ cos
nn∑
k=1
xk
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� [ ]n ≥ 1
R>L�Man = 1 +
√2 + 3
√3 + · · · + n
√n��� ] [ e�LuMJP�\?M
n∑
k=1
k√
k
a2k
<2n + 1 + (ln n)2
n + 1 + 12(ln n)2
�
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Ln =
n∑
k=1
k√
k
a2k
\�^�cRn =
2n + 1 + (ln n)2
n + 1 + 12(ln n)2
� �uc�S@]5L�a5MXa [ ��T�f�M5\?M5S [ ^ �8Y LhViL�LFMJP�\�M
L1 = 1�L2 ≈ 1.2426
�L3 ≈ 1.3396
�L4 ≈ 1.3905
�R1 = 1.5
�R2 ≈ 1.6914
�R3 ≈ 1.7828
� \�^�cR4 ≈ 1.8322
���L�^�aJL �
Ln < Rn
g|[ ]n = 1
�2�3�4�
� � �
� =�� 6M898+?<L�4OA+GB67An ≥ 5
f � CP: i 4OA+G34�kK?<: i ADC5=B:f(x) = x1/x CK8$;34 i ID476�8+CK:<¥=B:
(e, ∞)¢B� 4�GB6��B4>¢<ku=BI$4M6 i G
k ≥ 5¢1 < k1/k ≤ 51/5 ≈ 1.3797
f � =�AE4 6M2P8-=A+GB67Aak ≥ k
ku=BI�6M2@2k ≥ 1
f�� 47: i 4>¢
Ln = L4 +
n∑
k=5
k√
k
a2k
< L4 + (1.3797)
n∑
k=5
1
k2< L4 + (1.4)
∫ n
4
dx
x2
= L4 + (1.4)(
1
4− 1
n
)
< (1.4) + (1.4)(
1
4
)
= 1.75f
� CK: i 4Rn = 2 − 1
n + 1 + 1
2(ln n)2
> 2 − 1
n + 1≥ 2 − 1
6> 1.8
¢�C@A�ku=>2@25=��a8A+GB67A
Ln < Rnf
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∑
k=1
k√k
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S �i&BPRP &�S ('��g^E*��(n = 8
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+
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a
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p
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vf¡M4�A
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t ≤ sf�� G34M:y¢r8*CP: i 4
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1
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p+
1
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2
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