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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100 30 o 13 13 10 . . abcd e a(b + c + d + e) = 128 b(a + c + d + e) = 155 c(a + b + d + e) = 203 d(a + b + c + e) = 243 e(a + b + c + d) = 275

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Page 1: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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a(b + c + d + e) = 128¢

b(a + c + d + e) = 155¢

c(a + b + d + e) = 203¢

d(a + b + c + e) = 243¢

e(a + b + c + d) = 275f

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Page 2: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 3: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 8: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 9: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 10: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 11: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 12: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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ORO1PJBCP8-4 i A�6�A�Hr=>CP:>A

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MID478*?32�ADCK:<¥OCP: |OM | = |O2M | f��=B:3894��>?r4M:>AD2 Ty¢

O1 = O2¢B6M:<;"A+G34�ku=>?<I�2PCP:<4M8�6MID4 i =B: i ?<IEID47:>A f

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4�C �B4M:�CP8-=B8 i 4�25478�AEI�CK6M:<¥\254ABC

��C@A+GAB = AC

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EAEIDCP8-4 i A$A+G34�A+G>CKID;�8*CK;<4BC ` A+GB67A$CK8\¢ BD = DE = EC

f � =BI�8*LF672P206�:<¥\2K4M8A¢C@Az6MH<H<4M6MI�8$6M8�CPk

∠ACP8zAEIDCP8-4 i AE4M;NJMT"A+G34a894�¥�LF4M:>A�8

AD6�:<;

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AB = AC = b6M:<;�2K4�A

AD = AE = yf �r25476�I�2�T ¢ 4ABD

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ABD¢ADE

6�:<;ACE

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2y2 sin β

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sin α = (y/b) sin βf � CK: i 4

y/b < 1¢�� 4 i =B: i 2@?r;<4NA+GB67A

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n�B4MIæADC i 4M8 f� G34Q894�A�8

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G¢ID4M8*Hr4 i ADC��B4�2�T f ¡M4�A

d(v)J34OA+G34a;<4M¥�ID4�4a=>krA+G34X�B47I�AD4*ò

vCP:

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vf¡M4�A

v1J34"6�:�TQ=>k�A+G34

n�B47I�ADC i 478R=>k

Gf � ?<H3Hr=B894 A+GB67A

d(v1) = mf � CK: i 4A+G34aLN6\òMCKL�?<L¿;<4M¥�ID4�4a=>ky6M:�T��B47I�AD4*òaCP8

n − 1¢M� 4aGB6��B4

m < nf�� k<� 4 i =B:38+C5;34MI

Page 13: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

A+G34m�B47I�ADC i 478 i =B:3:<4 i AE4M;OAD=

v1JMT�6M:a4M;<¥74>¢_� 4 ¤ :<=��ÉA+GB67ArA+G34MID4 i 6M:aJ<4�:<=R4�;3¥74i =B:3:<4 i ADCK:<¥X6M:�T�H36MCPI�=>kBA+G34ML ß5=�A+G34MI���CK894B¢�� 4�� =>?325;"GB6\�B4O6XAEI�CK6M:<¥\254X6�LF=B:<¥$A+G34Aæ� =Q=>kyA+G34ML 6�:<;

v1à fX� G34M:FA+G34�:B?<L�J34MI�=>k�4�;3¥74M8���CP2@20J34�6"LF6_ò�CPLN?<L CPk�4M6 i G=>k�A+G3478-4��B47I�ADC i 478�CK8 i =B:3:<4 i AD4�;NAE=F6M2@2 A+G34"=�A+G34MI��B47I�ADC i 478O=>k

Gf � CP: i 4aA+G34MID4�6�ID4

n−m=�A+G34MI<�B47I�ADC i 478�¢\A+G34�LF6_ò�CPLN?<L ;34�¥�ID4M4$Hr=B8*8*CKJB2K4�ku=BI�4M6 i G�=>kMA+G34

m�B4MIæADC i 4M8÷�=>CK:<4M;�AE=

v1CK8

n − mfz� G>CK8$6M2P8-=�L�476�:38�A+GB67A�A+G3=B894�=�A+G347I

n − m�B4MIæADC i 4M8$6�ID4=B:B2�T�÷�=>CK:<4M;FAE=NA+G34

m�B4MIæADC i 4M8�� G>C i G�6�ID4a÷�=>CP:<4�;NAE=

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v∈V

d(v) = (n − m)m + m(n − m) = 2m(n − m)f

� CK: i 4N� 4F6M2P8-=�GB6\�B4NA+G34N� 4�2P2K� ¤ :<=��a:VC5;34M:>ADC�A�T2|E| =

v∈V

d(v)ß@� G347ID4

|E| CP8�A+G34":B?<L�J34MIX=>k�4�;3¥74M8Dà+¢3� 4"8-4M4 A+GB6�A |E| = m(n − m)fR� G>CP8$�>6M2@?r4"CP8O6LF6_ò�CPLN?<L 67A�A+G34 CK:>AD4�¥747Iz�>6M2@?r4�=>k

m� G>C i GFCP8X:<4M6MID4M8EA�AE= 1

2nfX� G347ID47ku=BID4>¢ C@k

nCK8$4-�B47:y¢>A+G347:m = 1

2n ` CPk n CK8$=3;3;y¢�A+G34M: m = 1

2(n − 1)

f�� G>CP8zT>C54�25;B8

|E| =

n2

4

CPknCP8$4-�B4M:y¢

n2 − 1

4

CPknCP8$=3;<; f

� =BI�AE47:NHr=>CP:>AD8\¢�A+G34aLN6\òMCKL�?<L¿:B?<LFJ<47I�=>ky8-4M¥�L�47:>AD8�CK825f

� � ��µ�� � =�894�4XA+GB6�A�A+G>CK8�LF6_ò�CPLN?<L i 6M:FJ34�6 i G>C54-�B4M;y¢M� 4�8+CKLNH32 T�A�6 ¤ 4XA+G34n�B4MIæADC i 4M8O6�:<;�8*H32@C@A�A+G34ML CK:>AD=FAæ� =Q894�A�8�=>k 1

2n�B4MIæADC i 4M8XC@k

nCK8R4-�B47:y¢0=BI$6N894�A�=>k

12(n−1)

�B4MIæADC i 4M8�6�:<; 6X8-4\A�=>k 12(n+1)

�B4MIæADC i 4M8�CPknCP8z=3;3; f0� G34M: i =B:38EAEID? i A�6M2@2Hr=B8*8*CKJB2K4"4�;3¥74M8RJ34�Aæ� 4M4M:FA+G34a�B47I�ADC i 478R=>k�;>C���4MID47:>A�894�A�8X6�:<;Q:<=Q4M;<¥7478RJ34�Aæ� 4M4M:�B4MIæADC i 4M8Rk5ID=BLÂA+G34N896ML�4N894�A f � :�¥�I�6�H<G�A+G34M=BI�Ty¢yA+G34M894F6MID4 i 6M2@254M; i =BLNH32K4�AD4�J>C5�H<6MI�ADC�AE4�¥�I�6�H<GB8 ` A+G34�¥�I�6�H<GFku=BI�AE47:��B4MIæADC i 4M8�� G>C i G�¥\C �B4M8�A+G34 LN6\òMCKL�?<L :B?<L�J34MI=>k�4�;3¥74M8�CK8$;34M:<=�AD4�;

K5,5f �

��� ���\�����U����g ��G�E�>"���C �M #C!A� 3�'$E� ��P &�(' [Q.� $@IBQ�1�q3���8>&�(�� �K�EC!�+ [DTI�"L��� $���PRQ#�3�(�P $@IL&�S ]KLS�>FG�1RSU)+&�(\"B)R*��#��� $>IL&�S ]KLS $�I�&.SU^E&�(K��I.*'�12@^E&��@��(��S (�)���FX][�U�P+������Q#P S��(7�µ ¯ ë � fEª ä � � � é�ã � ���O_rã � �7å �´�µ ° �Mä-ê� � � � ¯Mã�ä � ª ����® � �oµ

¡M4�Aa¢b¢cJ34NHr=B8+C@ADC �B4NID476M2�:B?<LFJ<47I�8O��C@A+G

a + b + c = 1f 4�C �B4M:�A+GB6�A

ab + bc + ca = 13

¢>�r:<;"A+G34X�>6M2@?r4M8$=>k�ìß56\à a

b+

b

c+

c

a

¢ ß5J�à a

b + 1+

b

c + 1+

c

a + 1

fs f � � å �BêKç � è � �c²�ç�ê ���"¯ � è Mä ����� � ± «�è ã��é7êKç � � � ±�MèBç f

� G34"¥\C �B4M: i =B:<;BC�ADC5=B:38a + b + c = 1

6M:<;ab + bc + ca = 1

3

CKLNH32 TNA+GB6�Aa = b = c = 1

3

¢3J<4 i 67?<8-4(a − b)2 + (b − c)2 + (c − a)2 = 2(a2 + b2 + c2 − ab − bc − ca)

= 2[(a + b + c)2 − 3(ab + bc + ca)]

= 2(

1 − 3 · 13

)

= 0f

Page 14: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

�����

� G347ID47ku=BID4>¢ a

b+

b

c+

c

a= 3

6M:<; a

b + 1+

b

c + 1+

c

a + 1=

3

4

fsæs f ��� å��3êKç � è ��� � �7é7ê i¯ � ��ä�ç-± Bã�ä � ®�èBç(¯Mã�äæé*ç � � ��� � � � � ¬ �>ã�è � é ��ç5ä+ã\é ���ä �>ã�èyêKç5è� f

� ?rJ38EADC@AD?BADCP:<¥a = 1 − b − c

CP:>AE=ab + bc + ca = 1

3

¢�� 4 ¥74\A(1 − b − c)b + bc + c(1 − b − c) = 1

3

¢=BI

c2 + (b − 1)c +(

13

− b(1 − b))

= 0f

�S4 i =BLFHB?BAE4RA+G34a;BCP8 i I�CKL�CK:36M:>A�ku=BI�A+G>CK8$�B?<6�;3I�6�ADC i CK:cì

(b − 1)2 − 4(

13

− b(1 − b))

= −3(

b2 + 23b − 1

9

)

= −3(

b − 13

)2 f� CK: i 4

cCK8RID476M2�¢ � 4�ID4��>?3CKID4"A+G34F;>CK8 i IDCPLNCP:36�:>A$AE=SJ34N:<=B:<�+:<4�¥�6�ADC��B4 f�� G34MID4�ku=BID4B¢

b = 13

f � CKL�CP2P6�I�2�T ¢�� 4 i 6�:É89G3=��¶A+GB6�Ac = 1

3

6�:<;a = 1

3

f�� G347:w� 4VGB6\�B4a

b+

b

c+

c

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6�:<; a

b + 1+

b

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4

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� : A+G34 i =B:��B4+ò �B?<6�;3I�CP2P67AD4MI�672ABCD

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��� å��3êKç � è ��� � 7é Mè �Xã�è 3ã\ä � 5é7ê �è � �7å ��² ��ä Bã � fß56\à � G34�8*?<L¿=>krA+G34a6M:<¥\25478�CP:F�B?<6�;3I�CP2P67AD4MI�672

ABCDCP8

2(α + β) + 3(γ + δ) = 2πf

� ?<LFL�CK:<¥VA+G34w6�:<¥\2K4M8FCK: 4EAB6�:<; 4ECD

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7

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BDCK8

π − (α + β) =3π

7

f

Page 15: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

ßuJ�à � ?<LFL�CK:<¥$A+G34O6�:<¥\2K4M8�CP: 4DAB¥\C �B4M8�A+G34R4��>?<67ADCK=B:

2α + β + δ = πf

Ú 8*CP:<¥�ß � à*¢M� 4 ¥74\Aα + δ =

7

f�� CK: i 4δ > 0

¢�� 4�894�4OA+GB67Aα <

7

f£ :�A+G34a=�A+G347IzGB6M:<;y¢B8+?<LFL�CK:<¥�A+G34�6M:<¥\25478$=>k 4CAB

T>C54�25;B8�A+G34a4��>?<67ADCK=B:α+2β +γ = π

f�Ú 8*CP:<¥Xß � à+¢7� 4O¥74�Aβ +γ =

7` G347: i 4>¢ (4π

7− α

)

+γ =3π

7

¢=BI

γ = α − π

7

f � CP: i 4γ > 0

¢�� 4�894�4OA+GB6�Aα >

π

7

f��� ���i�����U����X ��H�������������%���3�H B"�".$K�'&�(')+*'�X,#&.����M/��12�3���$K����$�57"��98K/K 3�X5�DL��CX�3NO5���I�?3$

�M�B���1R$!,���$J57"��98@�9��C!�R 3DlI�"��E� $E��PRQ#�3�(�P $JIL&�S ]KLS9�>FG�1RSU)+&�(�"B)R*��#��� $JI�&.S ]KLS $JIL&�S ^E&�(�8!&�('�dI��2I�5kB/'<�C�����5�$�����F;m&�(�3n��P S $K�9��FZ&�(BS &3�µ ¯ ë © fEª ä � � � é�ã � ��� �6µ ��µ � µ � 7é7êuä ����¬ �è � �å � ä+ã � �è���ç�µ

Ù 4�AD4MIDLNCP:<4�A+G34�ID4M672O:B?<LFJ<47I�8a¢

d¢O¥\C��B47:�A+GB67A"A+G34�ID=3=�AD8Q=>kXA+G344��>?<67ADCK=B:

x2 + ax − b = 06�ID4

a6M:<;

c¢R6M:<;�A+G34wID=3=�AD8�=>kXA+G34�4��>?<67ADCK=B:

x2 + cx + d = 06�ID4

b6�:<;

df

� é*é�ã\è�êKç 7å@å��ê�yã�é J±�ã�é � å��3êKç � è � ����è �>ä+ã ° �Mè Mä � �0é7ê � �<ã�èyê�,¸�ç�â+ã � � âæç�ã�èyêKç��yâ �� ´�µ�²�ä � è�� � � â �>ç � � �ê�å� ���è��I²�ç�ê ���"¯ � è Mä ����� � ± «�è ã��é7êKç � � � ±�MèBç f

� CK: i 4�A+G34aID=3=�AD8�=>k A+G34 4��>?<67ADCK=B:x2 + ax − b = 0

6MID4a6�:<;

c¢�� 4aLN?<8EAGB6��B4

x2+ax−b = (x−a)(x−c) = x2−(a+c)x+ac ` A+G347ID47ku=BID4>¢ a+c = −a6�:<;ac = −b

f�� CPLNC@2K6MID2 Ty¢�8+CK: i 4XA+G34RID=3=�AD8�=>k3A+G34�4��>?<67ADCK=B:x2 + cx + d = 0

6�ID4b6�:<;

d¢M� 4O�r:<; A+GB67A

b + d = −c6�:<;

bd = df�� G>?<8\¢�� 4�=3J�AD67CK: A+G34Rku=>2@25=���CP:<¥8�T38EAE47L =>ky4��>?<67ADCK=B:387ì

a + c = −a¢

ac = −b¢

b + d = −c¢

bd = df

� kd 6= 0

¢�A+G34M:b = 1

¢�6�:<; i =B:38-4M�B?r47:>AD2�T ¢2a = −c

¢ac = −1

¢�6�:<;c + d = −1

¢�� G>C i G TBCK472K;38a = ±

√2

2

¢c = ∓

√26M:<;

d = ±√

2 − 1f

� kd = 0

¢�A+G34M:2a = −c

¢ac = −b

¢b = −c

¢k5ID=BL'� G>C i GO� 4 i 6�: i =B: i 2@?r;<4$A+GB6�A

ac = cf � 4M: i 4B¢MCPk

c 6= 0¢7A+G347:

a = 1¢b = 2

¢6�:<;c = −2

f�� =�� 4-�B4MI9¢>CPkc = 0

¢�A+G34M:a = 0

6�:<;b = 0

f� G347ID47ku=BID4>¢>A+G34�8-=>2@?BADC5=B:"CK8

(a, b, c, d) ∈{

(0, 0, 0, 0)¢(1, 2, −2, 0)

¢ (±√

2

2, 1, ∓

√2, ±

√2 − 1

)} fI�*��12i^@�12iP^@�!S (')���FX][��P������+QBP SU��(3���.QB �FJSP+P+����

Page 16: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

µ ¯ í ± fEª ä � � � é�ã � ���O_rã � �7å �´�µ ° �Mä-ê� � � � ¯Mã�ä � ª ����® � �oµ¡M4�A

x1¢x2¢. . .¢xnJ<4$:<=B:<�*:<4M¥�67ADC �B4�ID4M672>:B?<LFJ<47I�8�896�ADCK8+k@TBCP:<¥ n

i=1

xi = nf

¡M4�Axn+1 = x1

f � G3=�� A+GB6�A n∑

i=1

xixi+1 ≤ nC@k

n ∈ {1¢2¢3¢4} ¢zJB?BAa:<=�A:<4 i 4M8*896MIDC@2�T"C@k

n ≥ 5f

��� å��3êKç � è ����²\çæê ���"¯ � è Mä ����� � ± «Mèyã��é�êKç � � � ±��è>ç f�SG34M:

n = 1¢�� 4aGB6��B4

x1 = 1f�� G347:

x21 ≤ 1

f¡M4�An = 2

f$� G347:x1 + x2 = 2

f �BT�A+G34 g � 4�� � :<4M�B?<672PC�A�T ¢3� 4�=3J>A�6MCP:√

x1x2 ≤ x1 + x2

2= 1

f�� 47: i 4>¢2∑

i=1

xixi+1 = x1 + x2 ≤ 2f

� �>?<6M2@C@A�TFG3=>2K;38�CPky6M:<;F=B:B2 T�C@kx1 = x2 = 1

f� =���254\An = 3

f�� G347:x1 + x2 + x3 = 3

f �BT�A+G34X� 472@25� ¤ :<=��a:Nß56M:<;F476�8�TAE=�H3ID=M�B4_à�CK:<4M�B?<672PC�A�T3(x1x2 + x2x3 + x3x1) ≤ (x1 + x2 + x3)

2 ¢� 4a894�4OA+GB6�A

3∑

i=1

xixi+1 = x1x2 + x2x3 + x3x1 ≤ (x1 + x2 + x3)2

3= 3

f� �>?<6M2@C@A�TFG3=>2K;38�CPky6M:<;F=B:B2 T�C@k

x1 = x2 = x3 = 1f� 4+òMA i =B:38+C5;34MI

n = 4fO� G34M:

x1 + x2 + x3 + x4 = 4f �BTNA+G34 g � 4��� :<4��>?<6M2@C@A�Ty¢�� 4 ;34�;>? i 4RA+GB6�A

√x1x2 + x2x3 + x3x4 + x4x1 =

(x1 + x3)(x2 + x4)

≤ (x1 + x3) + (x2 + x4)

2= 2

f� 47: i 4>¢

4∑

i=1

xixi+1 = x1x2 + x2x3 + x3x4 + x4x1 ≤ 22 = 4f

� �>?<6M2@C@A�TFG3=>2K;38�CPky6M:<;F=B:B2 T�C@kx1 = x2 = x3 = x4 = 1

f� CP:36M2@2�T ¢y254\A

n ≥ 5f �S4N894�A

x1 = x2 = 12n6�:<;

x3 = · · · = xn = 0f� G347:

x1 + x2 + · · · + xn = nf � CP: i 4

n > 4¢

n∑

i=1

xixi+1 =n

2· n

2=

n

4· n >

4

4· n = n

f��� ���g���������e ��T�E�>"���C �M 3C!A9 [�'$M�U��P &�(� [Q�� $JI�Q�1�q#��.8!������������� �����! #"�"�$M�'&�(')+*'�e,#&��U���

/'�12�3���$9����$E5K"L��8�&�('�Z�9��C!�R 3DjI�"��E� $'��PRQ#�3�(�P $�I�&.S ]KLSB��FG�1RS)&�(Z"B)R*��#��� $>I�&.S ]KLS $�I�&.SU^E&�(K�

Page 17: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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20 216 5 4

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16�:<;

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Page 18: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

� =BI�4+òM6�LNH32K4B¢ i =B:38*CK;<47I21f � CK: i 4

21672KID476�;�TaGB6M8�:<47CK¥7G3J<=>?<I�8

206�:<;

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� �� � �17

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Page 19: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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f�BTN6�;3;BCP:<¥OA+GBID4M4aH<67CKI�8�=>k i =B:<¥�ID?r47:>A�� Aæ��CP:y§�AEIDCP6�:<¥\2K4M8(3, 4, 9)

6�:<;(16, 17, 22)

¢(6, 10, 25)

6M:<;(12, 19, 23)

¢É6�8�� 4�2P2V6�8(7, 21, 24)

6�:<;(8, 11, 20)

¢�=B:<4i =BLNH32K4�AD4M8OA+G34N6�IDI�6�:<¥747L�47:>AOku=BI$A+G34N�<I�8+AO;36\T fI7 =�AD6�ADCK:<¥�A+G34N:B?<L�J34MI�8 =B:�A+G34i CKI i 2K4B¢r=B:<4�8EAE47HQ6�A�6aADCKLF4B¢r¥\C��B478$A+G34 6�IDI�6�:<¥747L�47:>AD8�ku=BI�A+G34�:<4*ò7A12;B6�TB8 f�� G348*CK¥�:BCP� i 6M:>AXku4767AD?<ID4N=>k�A+G>CK8R6�IDI�6�:<¥747L�47:>AXCK8XA+GB6�AR476 i G�H36MCPIO=>k i =B:<¥�ID?r47:>A�AEIDCP6�:<�¥\25478 i 6�:�J34V6M8989= i CK6�AE4M;�AD=�6�AEIDCPH32K4�A {a

¢b¢

c = a + b} ¢�� G34MID4 a¢

b¢�6�:<;

c6�ID4XA+G34R2547:<¥_A+GB8$=>k3A+G34�8-G3=BIæAE478+A�6�I i 8$J34�Aæ� 4M4M:�A+G34��B4MIæADC i 4M8�=>k<A+G34OAEI�CK6M:<¥\254 f�� G34AEIDCP6�:<¥\2K4(2, 26, 18)

i =BIEID4789H<=B:<;38jAD= {2¢

10} ` (3, 4, 9)i =BIEID4789H<=B:<;38jAD=

{1¢5¢6} ` (10, 6, 25)

i =BIEID4789H<=B:<;38$AE= {4¢7¢11} ` 6M:<; (21, 24, 7)

i =BIDID4M8*Hr=B:<;B8AE= {3¢9¢12} f0� G34M894�ku=>?<I AEI�CKHB254\AD80ku=BIEL'6�H36�IæADC@ADCK=B:a=>k�A+G34$894�A {1

¢2¢. . .¢12} f � ACK8z:<=�A�H<=B898+C5J>254�AD= �r:<;�8*? i G�6�H36�IæADC@ADCK=B:�=>k {1

¢2¢3¢4¢5¢6} ` A+G>?<8\¢�A+G>CP8zL�4\A+G3=3;i 6M:3:<=�A�J34�?<894�;�AE=�89=>2��B4��yCKI ¤ LN6�:y§ 8�=BI�C5¥\CP:36M2rH<ID=3J>2547L f

�SGB67A�GB6��B4a� 4�¥�6MCP:<4�; � ��=BID4"H<ID=3J>2547LF8�A+GB6M:�6�:38D� 4MI�8\¢yJB?BA�� 4�;3=�GB6\�B46 8+AEI�6�AE4M¥-T"AD=N89=>2��B4��yCKI ¤ LN6�:y§ 8 ��i G3=3=>2K¥\CKI�2�1<ID=3J>2547L°ku=BI i 47I�A�6MCP: i 6�894M8 f � 47ID4a6�ID48-=BLF4�:<4\� i GB6M2@2547:<¥74M8zA+GB6�A�TB=>?FLF6\T�2@C ¤ 4OAE= AD6 i*¤ 2K4OTB=>?<I�89472@k ft �>ô7~�~@ï�îi��ï�� f � G3=��¿A+GB6�A�C@kzA+G34Q894�Aa=>kzCP:>AE4M¥74MI�8

A = {1¢2¢

. . .¢3n} i 6M:�J<4H<6MI�ADC�ADC5=B:<4M;�CK:>AD=

n;>CK8D÷�=>CK:>AX8+?rJ3894�A�8

Ai = {ai¢bi¢ci}

ßPku=BIi = 1

¢2¢. . .¢nà8*? i GaA+GB67A

ai + bi = ciku=BI�4M6 i G

i¢MA+G34M:�47C�A+G34MI

n = 4k=BI

n = 4k + 1ku=BI�8-=BLF4CK:>AD4�¥747I

kf

Page 21: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� ���

��¤ =>2547L � � � GB6M8X8-G3=��a:NA+GB6�A�C@kn = 4k

=BIn = 4k + 1

ku=BI�89=BL�4aCK:>AD4�¥747Ik¢�A+G347:�8*? i G�6�H36�IæADC@ADCK=B:N=>k

A = {1¢2¢. . .¢3n} 4+ò�CP8+A�8 f ��=>?<I�:<4*ò7A i GB672P2K4M:<¥74OCP8L�=BID4�L�=3;34M8EA�A+GB6�:"A+G>CP8 f

t �>ô7~�~@ï�îi��ï�� f � CP:<;�672P2�H<6MI�ADC�ADC5=B:38 =>k�A+G34�894�AR=>k�CP:>AE4M¥74MI�8A = {1

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n;BCP8E÷�=>CP:>AR8*?rJB8-4\AD8

Ai = {ai¢bi¢ci}

ßPku=BIi = 1

¢2¢. . .¢nàE¢�8+? i GSA+GB6�A

ai + bi = ciku=BIz4M6 i G

if�Ù =�A+G>CP8�ku=BI

n = 4¢5¢8¢B6�:<;

9f

t �>ô7~�~@ï�îi��ï�� f�� CK:<;�6aH<6MI�ADC�ADC5=B:�k5ID=BL¿�yGB6M2@2547:<¥74��OAE="8-=>2 �B4���CPI ¤ LF6M:y§ 8 ��i G3=3=>25¥\CPID21<ID=3JB2K4ML f�Ù =�A+G>CK8�ku=BIv = 27

¢33¢51¢36M:<;

57f

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Page 22: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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BC¢

CA¢�6M:<;

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K¢L¢�6�:<;

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AAE=

BQf � k�� 4F6�8*8*?<LF4NA+GB6�A

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AB/BC �¯ f�� G3=���A+GB67Az:<=�H36MCPI�=>kyH<=B8*C�ADC��B4OCK:>AD4�¥747I�8x6M:<;

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3y2 = x4 + xf

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i =BLNH3?BAD4MI�8XJMT i 6�JB2K4M8 fg 894�AS=>k3A+G34M894

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ßK6�à Ù 4M:<=�AD4"JMTc(L)

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A6�:<;

c(A) = c(B)C@k0A+G34-TQ6�ID4 i =B:3:<4 i AD4�;�JMT�6 i 6�JB2K4"6�:<; |c(A) − c(B)| ≤ 1=�A+G34MI���CK894 f

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nf ¡M4�A

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Af

� =BIn¢k ≥ 2

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rJ<4�A+G34 i CPI i ?<LFI�6�;BC@?<8�6M:<;RA+G34�CP:3I�6�;>CP?<8�=>k 4ABC

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Page 23: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

² f ¡M4�ApJ<4a6aH3IDCPL�4>¢B6�:<;F;347�<:<4

fp(x) = xp−1 + xp−2 + · · · + x + 1f

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m(m − 1)f

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pn+1CK8�6aH3IDCPL�4 f

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Ø f�� G34a894��>?r4M: i 4a0¢a1¢a2¢. . .

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n��C@A+G

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fá f ¡M4�A

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Page 24: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 25: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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Page 26: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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x2yz + xy2z + xyz2 ≤ 13

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 MèyâEã��3¶ � é�«ã�¸ �7çPé �t«� ��³/¬ �äEä+ã�ä � ��®0è>ç$¯Mã\ä�é+çæê 3ê ª � åPç�ê��ã�âDè>ç�â �<ã ��Bê�å �Mè � �¬ �ä+â+ã-å � è��� � ��7çKè � ��ã ��� ä*ã ���oµ ��Mè � �åPå � � J± �<ã�è ���1² �E® � � �X_rã � �7å 8´�µ ° ��ä-ê ���� � ¯Mã�ä � ª ��� ® � � � Mè � � �¨­ Mä � ²Jµ �8µ � �è ��� �RçPå � ä�ç � ¸� �Mä�ç�ã\ä ®0è>ç$¯Mã\ä�é+çæê ���� 3ê�ã�ä�å � � � � ´�µ �"ã �<ä�é�ê �7ç(¯Mã�ê�yãXé � å��3êKç � è ��� ¬ Bê�çPå@å�ã"µ

� ID=BL A+G34 � 6M? i G�T ��i G��a6MI�Þ � :<4M�B?<672PC�A�T�6�:<;"A+G34aG�T3H<=�A+G34M8+CK8\¢�� 4aGB6��B4x2yz + xy2z + xyz2 = xyz(x + y + z)

≤ xyz(12 + 12 + 12)1

2 (x2 + y2 + z2)1

2 =√

3 xyzf

£ :QA+G34F=�A+G347IXGB6�:<; ¢ 13

= 13(x2 + y2 + z2) ≥ 3

x2y2z2¢y?<8+CK:<¥ A+G34 g � 4��� :<4��>?<6M2@C@A�T ` G347: i 4>¢ xyz ≤ 1

3√

3

fX� G34�;<478*CPID4�;FCK:<4M�B?<672PC�A�TFku=>2P2K=��a8�CPLFLF4�;>CK6�AE4�2�TJMT i =BLFJBCP:BCK:<¥XA+G34RAæ� ="ID4M8+?32@A�8 f´aã <ê�­Oã���ç$¯Mã ê�yãOé � å �BêKç � è ��� �o«� ��³R¬ MäEä*ã\ä � µ

� ID=BL A+G34�CK;<47:>ADC@A�T(a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca)

6�:<;A+G34O� 472@25� ¤ :<=��a:"CK:<4M�B?<672PC�A�Ta2 + b2 + c2 ≥ ab + bc + ca

¢>C�A�ku=>2@25=��a8�A+GB67A3(ab + bc + ca) ≤ (a + b + c)2

f ß � à

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� �M�

� 4�A�ADCP:<¥a = xy

¢b = yz

¢B6�:<;c = zx

CP:Fß � à�TBCK472K;383(x2yz + xy2z + xyz2) ≤ (xy + yz + zx)2 ≤ (x2 + y2 + z2)2 = 1

¢k5ID=BL � G>C i G � 4a¥74\A

x2yz + xy2z + xyz2 ≤ 13

f� =�ADC i 4OA+GB67A�4M�B?<672PC�A�TNG3=>25;B8�� G34M:x = y = z = 1√

3

fë f ¡M4�A

m6M:<;

nJ34 CP:>AE4M¥74MI�8O¥�ID4767AD4MI�A+GB6�:

1f ��=B:38+C5;34MI�6�:

m × nID4 i AD6M:<¥\?32K6MI¥�IDCK;Q=>k0H<=>CK:>A�8�CP:NA+G34�HB2K6M:<4 f � =BLF4

k=>kyA+G3478-4 Hr=>CP:>AD8�6MID4 i =>25=>?<ID4M;�ID4M;FCK:F8*? i G6X�a6�TaA+GB67A�:<= A+GBID4M4�ID4M;"Hr=>CP:>AD8�6MID4XA+G34��B4MIæADC i 4M8�=>k 6RIDCK¥7G�A+�*6M:<¥\254M;�AEI�CK6M:<¥\254XAæ� ==>k�� G3=B894"8+C5;34M8X6�ID4"H36�I�672P2K472 AE=NA+G34"8+C5;34M8O=>k�A+G34�¥�IDCK; f�Ù 4\AE47IEL�CK:<4 A+G34�¥�ID4767AD4M8EAHr=B8*8*CKJB2K4X�>6M2@?r4 =>k

kf

��� å��3êKç � è ��� ª ç�ã�äEä+ã�¬ � äEè3é��\ê�ã-ç5è � ° �çKé � è3é�³R¸� � ê�ê�ã ����ä��è â+ã"µ�S4���C@2P2yH3ID=M�B4>¢yJMTFCP:<;B? i ADCK=B:�=B:

p = m + n¢3A+GB6�A�A+G34�¥�ID4M6�AE478+A�Hr=B8*8*CKJB2K4�>6M2@?r4 =>k

kCK8

m + n − 2f

trôMö�ï � fp = 4

f� G34�¥�IDCK;�CK82 × 2

¢�6�:<;VA+G34QLF6_ò�CPLN?<L :B?<LFJ<47I =>k�ID4�;�Hr=>CP:>AD8 CP8 i 2K4M6MID2 T2 = 2 + 2 − 2

f�� G>?<8\¢�A+G34aID4M8+?32@AzG3=>25;B8�ku=BIp = 2

ftrôMö�ï�� f

p ≥ 4fg 898+?<L�4 A+GB67A�A+G34�ID478*?32�AXG3=>25;B8Oku=BI$6M2@2

m¢n > 1

8+? i G�A+GB6�Ap = m + n

f¡M4�A�?<8 i =B:38+C5;34MI�6 ¥�IDCK;���C@A+Gp + 1 = m + n

f�QC@A+GQ:<=�2K=B898R=>k�¥747:<4MI�672PC�A�T ¢<� 4�LN6�T�6M898+?<L�4 A+GB6�A$A+G34�¥�IDCK;QCK8Xku=BIELF4�;�JMT

mID=��a8a6M:<;

ni =>2P?<LN:38R��C�A+G

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�:<;

Page 28: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

���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

Page 29: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

� 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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Page 30: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

�����

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

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

f ���� å(¯Mã�� ��� ° � � J±�±�ã�� � 7é9é+çPå �� � êuä 7é � � �Mä � � ��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�ê�yãXé � å��3êKç � è ��� � � � ��µ

� 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¢

Page 31: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

� 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

¢� G34MID4XA+G34O2K6M8+A�8EAE47H"CK8�JMT�A+G34OCP:<;B? i ADCK=B:NG�T3H<=�A+G34M8+CK8 f�� CK:3672P2 Ty¢�8*CP: i 4

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:<;

MJ3472K=B:<¥AE=S894�¥�LF4M:>A�8

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

6�ID4 i =B: i ?<IDID4M:>A f��� å��3êKç � è ��� ��ã ��� ä+ã ���oµ�� �è�� 7å@å � � X± �<ã\è����1² ��® � �oµ

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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

Page 32: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

� 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

f��� 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$¯Mã`¬ 3ê 7ç@åPå�ã�· é$é � å �BêKç � è1µ

� 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 +√

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

Page 33: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

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

��� å��3êKç � è ��� ª ç�ã�äEä+ã�¬ � äEè3é��\ê�ã-ç5è � ° �çKé � è3é�³R¸� � ê�ê�ã ����ä��è â+ã"µ� =BI

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

f��� 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$¯Mã`¬ 3ê 7ç@åPå�ã�· é~­$ä�ç�ê�ãX³ � ��µ

� G34O8�T38EAE47L GB6�8z6O?<:BC5�>?r4R8-=>2@?BADC5=B: CPk<6�:<;"=B:B2�T CPkBA+G34O2@CK:<4`��C�A+G"4��>?<67ADCK=B:

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

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���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

��� 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 � Mè �-_rã�� ��åG´�µ ° ��ä-ê ��� � � ¯Mã\ä � ª ����® � �oµ �"ã ��ç$¯Mã ° ��ä-ê ��· éé � å��3êKç � è���± � ��ç ��ã � ���Nê� ã ã ��çæê � ä)µ

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

Page 35: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

� 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

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��� �

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

� GB6�A i =BLNH32K4�AD4M8RA+G>CK8 :B?<LFJ<47Ia=>k�A+G34 � � äEè ã�ä f � ��C@2P2�J<4�� =BI ¤ CP:<¥�=B:VA+G34� 4MH>AE47L�J34MI � � äEè ã�ä J<4M¥\CK:3:BCP:<¥�CP:��w6�T ¢�89=w8-47:<;ÉLF4�TB=>?<I�:BC i 4S89=>2P?BADCK=B:38�6M:<;¥74M:<47I�6M2@C@Þ+6�ADC5=B:38�89=3=B: �

Page 37: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

��� �

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� =BI i 4MIæAD67CK:"89H<4 i CP6M238*?rJB8-4\AD8�=>k<A+G34O2K= i*¤ 4MI�8\¢�A+G347ID4OCK8z6�LN? i G"LF=BID4�472K4�¥�6M:>A�a6�T"AD=N6MH<H3ID=B6 i G"A+G34aH3ID=3JB2K4ML A+GB6�:�JMTN8-=>2 �BCP:<¥R6a2K6MID¥74�2PCP:<4M6MIz8�T38EAE47L f�� =��a6MID;A+G>CK8�4M:<; ¢>;347�<:<4$A+G34 é+ç �Mè Bê ��ä+ã =>k36X:367AD?<I�672B:B?<L�J34MI�AE=aJ<4$A+G34�8-4\A�=>k36M2@2>Hr=B8+C@ADC �B44*ò�Hr=B:<47:>AD8�6MH<H<4M6MIDCP:<¥XCP:�A+GB6�A�:B?<L�J34MI9§ 8�H<I�CKLF4Ok56 i AE=BI�C@Þ+6�ADC5=B: f � =BI�=>?<I�H3?<IDHr=B894M8C@A���C@2P2�J<4 i =B:��B47:BC547:>A$AE=N�aIDC�AE4�L�47L�J34MI�8�=>k�A+G34�8*CK¥�:367AD?<ID4N=>k�6N:B?<L�J34MI�CP:S6�89�i 47:<;BCP:<¥a=BID;34MI f � =BIz4+òM6�LNH32K4B¢12 = 2231 6�:<;NGB6�8�8+C5¥�:36�AD?<ID4 {1

¢2} ` 15 = 31516�:<;FGB6M8$8+C5¥�:36�AD?<ID4 {1} f�� =�AD4RA+GB6�A�A+G34a8+C5¥�:36�AD?<ID4 =>k 1 CK8zA+G34 47LFH>A�T�8-4\A-¢ ∅ f� A CK8N4-�>C5;34M:>AaA+GB6�AaA+G34S8-�>?<6�ID4�k5ID4�4V:B?<LFJ<47I�8N6�ID4SH3ID4 i CP8-4�2�T�A+G34S:B?<L�J34MI�8� G3=B8-4�8+C5¥�:36�AD?<ID4�CP8 i =B:>A�6MCP:<4�;"CK:"A+G34�8-4\A {1} f�� G34a89�B?<6MID4M8�6�ID4OA+G3=B894�:B?<L�J34MI�8� G3=B8-4�8*CK¥�:367AD?<ID4�CK8 i =B:>A�6MCP:<4�;RCP:RA+G34$894�A {2

¢4¢6¢. . . } ¢76�:<;OA+G34 i ?rJ34M8�6�ID4zA+G3=B8-4:B?<L�J34MI�8$� G3=B8-4�8*CK¥�:367AD?<ID4�CP8 i =B:>A�6MCP:<4�;�CP:FA+G34"8-4\A {3

¢6¢9¢. . . } f � :S¥747:<4MI�672�¢¥\C��B47:É6S8+?rJ3894�A

A=>k�¢�� 4Q254\A

σ(A);34M:<=�AD4QA+G34�8-4\A�=>k�6M2@2�:B?<L�J34MI�8 � G3=B8948*CK¥�:367AD?<ID4�CP8 i =B:>A�6MCP:<4�;aCP:

Af0� G34X894�A�=>k389�B?<6MID47k5ID4M4X:B?<L�J34MI�8�CK8

σ(

{1}) ¢7A+G34�8-4\A=>k�89�B?<6MID4M8�CP8

σ(

{2¢4¢6¢. . . }

) ¢3A+G34�8-4\A$=>k i ?rJ34M8�CP8σ(

{3¢6¢9¢. . . }

) ¢r6�:<;�8-==B: f"£ k i =>?<I�8-4>¢�LN6�:�T�8+?rJ3894�A�8�=>k�6�ID4�:<=�A

σ=>k�6M:�T>A+G>CP:<¥ f � =BIX4+òM6�LNH32K4B¢ A+G34Hr=�� 47I�8�=>k

2ßu=BIz=>ky6M:�TN89H<4 i C@� i H<I�CKLF4\à�6MID4a:<=�Az=>krA+G34�ku=BIDL

σ(A)ku=BIz6M:�T

Af

� ?<H<H<=B8-4�A+G34�894�A0=>k>8+AD?r;34M:>A�8�CK8�=>k�A+G34�ku=BIELσ(A)

ku=BI�89=BL�4$8+?rJ3894�AA=>k�f

� 8�A+G347ID4�6�: 4�254M¥�6�:>A �a6\TOAE= i GB6MI�6 i AD4MI�C@Þ*4�A+G34�894�A0=>k>2K= i*¤ 4MI�80A+GB6�A ��CP2@2>J<4�254�kPA�=BH<4M:JMTQA+G34M894N8EAD?r;<47:>AD8 � � :<;34�4M;�A+G347ID4�CP8 � �S4�:<4�4M;V=B:<4�L�=BID4N;<4��r:BC�ADC5=B:�CP:V=BID;<47IAE="8EAD6�AE4XA+G34�ID478*?32�A f 4�C��B47:N6�894�AA=>k :36�AD?<I�6M2<:B?<L�J34MI�8\¢>254\A

e(A)J<4R6M2@2<:367AD?<I�672:B?<L�J34MI�8OA+GB67AX6�ID4F¥�ID4767AD4MI$A+GB6M:�=BIX4��>?<6M20AD=�6�: ã3¯Mã�è :B?<L�J34MIOßKCP: i 2P?r;>CK:<¥

0à$=>kA+G34 472K4MLF4M:>A�8$=>k

Af�� =BIz4*òM6MLFHB254>¢>CPk

A = {3¢6¢9¢. . . } ¢>A+G347:

e(A) = {1¢2¢6¢7¢8¢12¢13¢14¢18¢19¢20¢. . . }

= {n ∈ � | n ≡ 0¢1¢2 (mod 6)} f

o �BïM} �*ï� � f ¡M4�AA ⊆ �

f � kO8+AD?r;34M:>A�8σ(A)

6�ID4�;BCP89H367A i G34�; ¢$A+G34M:�2K= i*¤ 4MI�8σ(

e(A)) ID47LF67CK:F=BHr47: f

ª ä � ��� � ¡M= i*¤ 47Im��CP2@2�ID47LF67CK:Q=BHr47:�C@k�6M:<;�=B:B2 TFCPk06M:�=3;<;�:B?<LFJ<47I�=>k08+AD?r;34M:>A�8AE=>? i G�C�A ` A+GB6�AaCP8�¢�C@k m

GB6M8"6�:�=3;<;w:B?<LFJ<47I�=>k$;BC �BCP8-=BI�8�6ML�=B:<¥NA+G34�:B?<L�J34MI�8CK:FA+G34�8+AD?r;34M:>A$8-4\A f � ?<H3Hr=B894 A+GB67A�A+G34�8+AD?r;34M:>A�8σ(A)

6�ID4�8-47:>A$LF6MI i G>CK:<¥�¢ 6M:<;8*?<H3Hr=B894NA+GB67AO2K= i*¤ 4MImGB6�8aH<I�CKLF4Fk56 i AE=BI�C@Þ+6�ADC5=B:

m = pα1

1 pα2

2 · · · pαk

k

fw� =�AE4A+GB67A0A+G34O;BC �BCP8-=BI�8�=>kpαi

i

CK:σ(A)

6MID4X6M2@2B:B?<L�J34MI�8�=>k>A+G34Xku=BIDLpγ

i

¢�� G347ID4γ ∈ A

Page 42: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

6�:<;1 ≤ γ ≤ αi

¢<AE=3¥74\A+G34MIz��C�A+GNA+G34":B?<LFJ<47I1 = p0 ß58+CK: i 4 1 ∈ σ(A)

ku=BI�6M2@28-4\AD8Aà f�� =��

m ∈ σ(

e(A)) CPky6M:<;F=B:B2�T"CPk�476 i G

αi ∈ e(A) ` A+GB67A�CP8�¢>C@k�4M6 i G αiCK8�¥�ID4M6�AE47I�A+GB6M:F=BI�4��>?<6M23AD=2ai

LF4MLFJ<47I�8$=>kA¢>ku=BI�89=BL�4

ai ≥ 0f�� krA+G>CP8�CP8zA+G34i 6M8-4>¢3A+G34M:FA+G34�:B?<LFJ<47I�=>k�;BC �BCP8-=BI�8X=>k

m6�LF=B:<¥�A+G34�8+AD?r;34M:>A�8�� G3=���C@2P2yLN6�I i GCK8

(2a1 +1)(2a2 +1) · · · (2an +1)¢�6M:�=3;<; :B?<LFJ<47I f � 47: i 4�2K= i*¤ 4MI

mID47LF67CK:38=BHr47: f � = i =BLFHB254\AE4�A+G34RH3ID=3=>kæ¢>8+?<H<H<=B8-4�A+GB6�A�8-=BLF4

αi /∈ e(A)¢�896\T

αiCP8�¥�ID4M6�AE47IA+GB6�:�=BI$4��>?<6M2 AD=

2ai − 1L�47L�J34MI�8O=>k

Af�� G347:FA+G34":B?<LFJ<47I�=>k�;>C��>CK89=BI�8O=>k

m6�LF=B:<¥�A+G34$8+AD?r;34M:>A�80� G3=�LN6�I i G i =B:>A�6MCP:38�A+G34$k56 i AE=BI2ai −1+1 = 2ai

¢MLN6 ¤ CK:<¥C@A�4-�B47: f�� G>?<8�¢>2K= i*¤ 4MIm��C@2P2 J34 i 2K=B8-4M; f

�S4O:<=�AE4�A+GB67A�A+G34OH<ID=3=>k =>kBA+G>CK8zID478*?32�A�CK8z6R8EAEI�6MCK¥7G�ADku=BIæ�a6MID;�¥74M:<47I�6M2@C@Þ+6�ADC5=B:=>k�A+G34N8EAD6M:<;36MID;Sku=BIDLF672�H3ID=3=>kz=>k�A+G34N8-=>2@?BADC5=B:�AE=�A+G34F=BIDCK¥\CK:3672�2K= i*¤ 4MI�H<ID=3J>2547Lß5894�4>¢0ku=BIR4+òM6�LNH32K4B¢ � � � à fF� G>CK8�ID4M8+?32@AOLF6 ¤ 4M8a4M6M8�TQ� =BI ¤ =>k�894-�B4MI�672�CP:>AE47ID4M8EADCK:<¥H<ID=3J>2547LF8$ß56ML�=B:<¥XA+G34ML A+G34 =BIDCK¥\CK:3672�à f� �*}O��~Pï� � f�� k�6M2@2 A+G34�8+AD?r;34M:>A�8O6MID4"894M:>A$;<=��a:FA+G34"GB672P2�¢3� G>C i GF25= i*¤ 47I�8XID47LF67CK:=BHr47: �� �*}O��~Pï� � f � k�A+G34�8-�>?<6�ID478�6�ID4$8-47:>A�;<=��a:RA+G34XGB672P2�¢\� G>C i GR25= i*¤ 47I�8�ID47LF67CK: =BH<4M: �� �*}O��~Pï� � f � k�A+G34

n��� Hr=�� 47I�8R6�ID4�894M:>AX;<=��a:�A+G34NGB6M2@2�¢<� G>C i G�25= i*¤ 47I�8RID47LF67CK:=BHr47: �

� �*}O��~Pï� � f � k =B:<4���CK89G34M8�AD= ¤ 4�47H�=B:B2�Ta2K= i*¤ 4MI�:B?<L�J34MI1=BH<4M:y¢7� G>C i G 8+AD?r;34M:>A�88-G3=>?32K;FJ34a8-47:>AzLN6�I i G>CP:<¥ �� G34R2P6�8EA�H3ID=3JB2K4ML 2K4M6�;38�AD="6a:36�AD?<I�6M2 �>?r4M8EADC5=B:�ì � 8zA+G347ID4�6�:"CK:��B47I�8-4�=BHr47I+�67ADCK=B:�AE=NA+G34

ekK?<: i ADCK=B: � � A$CK8O:<=�AX;>C � i ?32@A�AD=Q8-4M4 A+GB67A�A+G34MID4�CK8 f � =BI$6�8*?rJB8-4\A

A=>k A+G34a:367AD?<I�672y:B?<LFJ<47I�8�¢B254\A

A + 1J<4RA+G34 894�A {1} ∪ {n + 1 | n ∈ A} ¢36M:<;;<4��r:<4

f(A)AD=�J34�A+G34X8�TBLFLF4�AEI�C i ;>C���4MID47: i 4O=>k

A6�:<;

A+1 ` A+GB6�A�CK8\¢�LF4MLFJ<47I�8=>krA+G34�?<:BCK=B:A ∪ (A + 1)

A+GB6�Az6�ID4�:<=�AzL�47L�J34MI�8$=>k�J<=�A+G f� �*}O��~Pï� � f � G3=��¿A+GB6�A

e6M:<;

f6�ID4FCP:��B4MI�894Q=BHr47I�67ADCK=B:38 f�� GB67AOCK8\¢�8-G3=��°A+GB6�A

e(

f(A))

= f(

e(A))

= Aku=BI�6�:�T�8-4\A

A=>ky:36�AD?<I�6M2 :B?<LFJ<47I�8 f

1<ID=3JB2K4ML���AE=3¥74\A+G34MIB��C@A+G � G34M=BID4ML � 4M8EAD6�JB2@CK89G$A+G34�ku=>2@25=���CP:<¥�ß@� G>C i GXLF6 ¤ 4M81<ID=3JB2K4ML � 6a89:36MH>à+ìo �BïM} �*ï� � f ¡M4\A

A ⊆ �f � kO2K= i*¤ 4MI�8

σ(A)6MID4VAE=�ID4MLN6MCP:�=BHr47:y¢X8+AD?r;34M:>A�8

σ(

f(A)) LN?<8EA�J<4a;BCP89H367A i G34�; f

t }��*}�~�~�ô�� � f0� G34O8-4\A�=>k<LF6MI i G>CK:<¥X8EAD?r;<47:>AD8�CK8�CK:aA+G34OCPLF6�¥74R=>kσCPk<6�:<;"=B:B2�T C@k3A+G348-4\A�=>k 2K= i*¤ 4MI�8�254�kPA�=BH<4M:�CP8�CK:"A+G34�CPLF6�¥74a=>k

σf

� G34M=BID4ML ��LF6 ¤ 4M8�2PCK¥7G�A�� =BI ¤ =>k<A+G34M894aH3ID=3JB2K4MLN87ì� �*}O��~Pï� �� f � k =B:<4$��CK89G34M8�AE= ¤ 4�47H�=B:B2�TaA+G34 i ?rJ<4X25= i*¤ 47I�8�=BH<4M:y¢7� G>C i G 8+AD?r;34M:>A�88-G3=>?32K;FJ34a8-47:>AzLN6�I i G>CP:<¥ �� �*}O��~Pï� �� f � k�=B:<4R��CP8-G3478�AD= ¤ 4M4MHQ=B:B2 T�A+G34

n��� H<=�� 4MI�8�=BHr47:y¢>� G>C i GN8+AD?r;34M:>A�88-G3=>?32K;FJ34a8-47:>AzLN6�I i G>CP:<¥ �

Page 43: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

�S4"8-4M4":<=�� A+GB67A�A+G34�4*ò7AE47:<;<4M;Q2K= i*¤ 4MI$H3ID=3JB2K4ML CK8O4M6M8*C@2�T�89=>2��B4M;�ku=BI$6M:�T8+AD?r;34M:>A0=BIy2K= i*¤ 4MIy8-4\A A+GB67AyCP8�;<4\AE47IEL�CK:<4M; i =BLFHB254\AE4�2�T�JMT�6�8+C5¥�:36�AD?<ID4�� i =B:>A�6MCP:BCK:<¥8-4\AA ` A+GB67A�CK8\¢rku=BI$894�A�8R=>k�8+AD?r;34M:>A�8R=BI�2K= i*¤ 4MI�8R=>k�A+G34�ku=BIDL σ(A)

ku=BI$89=BL�4Af

� =�� 4-�B47I-¢>A+G>CP8�CP8$6�J389=>2P?BAD472 TN:<=FG34�2KHNCP: i 6�894M8�� G34MID4RA+G34a8+AD?r;34M:>A�=BI�2K= i*¤ 4MI�8-4\ACK8�:<=�A�=>k�A+G>CP8�ku=BIEL f�g ;BC �047ID4M:>AXAD4 i GB:BCK�B?r4 i 6M:�=>kPAD4M:�J<4�JBID=>?r¥7G�AOAD=VJ<476�IXku=BI8*? i G i 6M8-478 f1<ID=3JB2K4MLN8 � 6M:<; � H3ID=M�>C5;34N?<8X��C@A+GS6F:<4 i 47898*6�I�T�CK:38+C5¥7G�A fS� =�AE4"A+GB67A�A+G346�:38D� 4MI�AD=n1<ID=3JB2K4ML � i 6�:ÉJ<4S8EAD6�AE4M;�ì � = ¤ 4M4MH�=BH<4M:É=B:B2�Tw2K= i*¤ 4MIa:B?<L�J34MI

1¢8-47:<;�=B:B2 T�A+G34�8-�>?<6�ID4�k5ID4�4X8EAD?r;<47:>AD8 f ¡�C ¤ 4_��CK894B¢�A+G34�6M:38E� 47I�AD=N1<ID=3J>2547L � i 6�:�J<48+A�67AD4�;yì � = ¤ 4M4MH�=BH<4M:F=B:B2 T"A+G34R25= i*¤ 47I�8zA+GB67Az6MID4

n��� H<=�� 4MI�8\¢B894M:<;�6M2@2r8+AD?r;34M:>A�8� G3=B8-4�:B?<L�J34MI CP8�A+G34SH3ID=3;B? i A"=>k$6V89�B?<6MID47k5ID4M4V:B?<LFJ<47I���C�A+G�6M:

n��� H<=�� 4MI f� G34�89�B?<6MID47k5ID4M4":B?<LFJ<47I�8 i 2K4M6MID2 T�HB2K6\T�6 i I�? i CK672�ID=>2K4 f �S4 2K4�A

S;<47:<=�AE4aA+G34 8-4\A=>k�8-�>?<6�ID4�k5ID4�4":B?<L�J34MI�8 ` S = {1

¢2¢3¢5¢6¢7¢10¢11¢13¢14¢. . . } f�g :<;�ku=BI6�:�TN:36�AD?<I�6M2r:B?<L�J34MI

m¢�� 4R254\A

mS = {ms | s ∈ S} f� �*}O��~Pï� � f�� k�=B:<4O��CP8-G3478zAE= ¤ 4�47H�=B:B2�T"2K= i*¤ 4MI

m=BH<4M:y¢B89G3=���A+GB6�A�=B:<4a89G3=>?325;;BCP89H367A i GN8EAD?r;<47:>AD8

mSf�� CP:>A_ì � 4�4�1<ID=3JB2K4ML � f

o �BïM} �*ï� � f ¡M4�AL ⊆ � J<4"A+G34 i =>2@254 i ADC5=B:S=>k�25= i*¤ 47I�8OAE=SJ34 ¤ 4MH>AR=BH<4M: f�� G34M:8+AD?r;34M:>A

n8-G3=>?32K;SJ<4"CK: i 2@?r;<4M;�CK:QA+G34�8-4\AO=>k�LF6MI i G>CK:<¥"8+AD?r;34M:>A�8RC@k�6M:<;V=B:B2�TQC@k

n ∈ lSku=BI�6�: � � � :B?<LFJ<47I�=>kyL�47L�J34MI�8

l ∈ Lf

ª ä � ��� � ¡M4\AL = {l1

¢l2¢. . . } ��C@A+G l1 < l2 < · · · f�� =�AE4aA+GB6�A L

LF6\TQJ34 �r:BC�AE4=BI�CP:B�r:BC�AE4 f�£ :<4O�a6\T"AD= ¤ 4M4MH�4+òM6 i AD2 T"A+G34R25= i*¤ 47I�8�CP:L=BHr47:�CK8�6M8�ku=>2@25=��a8�ì �rI�8EA8-47:<;V8+AD?r;34M:>A�8

l1Sf�g kPAD4MI�A+G34-T�GB6\�B4FLN6�I i G34M;y¢�=B:B2�T�25= i*¤ 47I

l1CP8 =BH<4M: fF� G34M:8-47:<;�8EAD?r;<47:>AD8

l2Sf�� =�AE4 A+GB6�A�:<=B:<4N=>k�A+G34�8EAD?r;<47:>AD8XCK:

l2S��CP2@2yAD=>? i GQ6�:�T�=>kA+G34��<I�8+A

l2 − 12K= i*¤ 4MI�8 f�� CK: i 4

l1 < l2¢B6MkPAD4MI�A+G>CP8�8-4 i =B:<; i 6�;3ID4a=>ky8EAD?r;<47:>AD8$GB6�8LF6MI i G34�; ¢ =B:B2 TN2K= i*¤ 4MI�8

l16M:<;

l2��C@2P2yJ34�=BHr47: f � k�=B:<4O� 4MID4RAE= i =B:>ADCK:B?r4aCP:NA+G34k56�89G>C5=B:y¢�H<ID4 i CK89472 TSA+G34N25= i*¤ 47I�8�CK:L� =>?32K;�J34Q=BH<4M: f�� =��¿2K4�A

n ∈ � fQ� G34M:n ∈ lS

ku=BI�=B:B2�TQ�<:BC@AD472 T�LF6M:�Tl ∈ L

f � ?<H<H<=B8-4nCP8R6M:V4�2547L�47:>AO=>k�H3ID4 i CP8-4�2�T

k=>k�A+G34�8-4\AD8

lS¢rku=BI

l ∈ Lf�� k

kCP8O4-�B4M:y¢<A+G347:QCP:FA+G34"6�J<=7�B4"8 i 47:36�I�C5=F8+AD?r;34M:>A

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n:<=�A�LN6�I i G>CP:<¥R67A�672P2 f�� k

kCP8�=3;<; ¢�A+G347:N8EAD?r;<47:>A

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p¢�� G>C i GV8+AD?r;34M:>A�8�L�?<8+A�J<4Q;>CK8*H<6�A i G34M; � � I�TA+G>CK8$J<=�A+G ��C�A+G

1 = p0 CP: i 2P?r;34�;�CP:"A+G34�2K= i*¤ 4MI�8-4\A-¢B6M:<;���C�A+G"C@A�:<=�A�CK: i 2@?r;<4M; f� �*}O��~Pï� � � f �SG>C i G�8+AD?r;34M:>A�8FLN?<8EANJ34�;BCP89H367A i G34�;�AE= ¤ 4M4MHn=B:B2�TwA+G34�H3IDCPL�425= i*¤ 47I�8�=BH<4M: �

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A=BHr47:�� G34M:"A+G34 GB6M2@2��a6\TCK8�CP:B�r:BC�AE4 f

o �BïM} �*ï� °� f ¡M4\AA ⊆ � J34�6�:�T�:<=B:<�*4MLNHBA�TQ8+?rJ3894�A$=>k08EAD?r;<47:>AD8 f�� G34M:FA+G34 8-4\A=>k 25= i*¤ 47I�8�254�kPA�=BHr47:FJMT"A+G34M894�8+AD?r;34M:>A�8�CK8�:<=�A

Af

ª ä � ��� � ¡M4�AA = {n1

¢n2¢. . . } ��C�A+G n1 < n2 < · · · f �y=B:38*CK;<47I$25= i*¤ 47I 2n1

f� G34a=B:B2�T�H3ID=BHr47I�;>C��>CK89=BIz=>k2n1

CP:ACK8

n1f � k

2n1 ∈ A6�:<;�A+G34a8EAD?r;<47:>AD8�CP:

ALF6MI i G ¢MA+G34M:"=B:B2 T 8+AD?r;34M:>A�8n16�:<;

2n1��CP2@2�AD=>? i Ga25= i*¤ 47I

2n1¢�6�:<; 8-=�C�A���C@2P2BJ<4i 25=B894�; f ��=B:��B47I�8-4�2�T ¢BCPk

2n1 /∈ A¢BA+G347:�=B:B2�TN8+AD?r;34M:>A

n1��C@2P2<AD=>? i G�25= i*¤ 47I

2n1¢6�:<;S89=QC@A���C@2P2�ID47LF67CK:V=BHr47: f�� :�4�C@A+G347I i 6�894B¢ A+G34N8EAD?r;<47:>AO894�AO;3=34M8R:<=�AXLF6�A i GA+G34�25= i*¤ 47I�8-4\A f

� �*}O��~Pï� � � f�� G34�6�J3=M�B4�H3ID=3=>krk56MC@2K8zCP:�6 i =BIEI�C5;3=BI���C@A+G"6R�r:BC�AE4R:B?<L�J34MIz=>kr25= i*¤ �4MI�8 f � G3=�� A+GB67A�A+G347ID4�CP8X6�894�AACK:Q6M:�T��<:BC@AD4 i =BIEI�C5;3=BIz� G347ID4"8EAD?r;<47:>AD8

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A2 A+G34�8-4\A {n2 | n ∈ A} f� �*}O��~Pï� � � f�� G34�89=>2P?BADCK=B:�AD= A+G34�=BIDCK¥\CK:3672325= i*¤ 47I�H3ID=3JB2K4ML 8-G3=��a8�A+G347ID4RCP8�6�8-4\AA��C@A+GFA+G34NH3ID=BHr47I�A�TQA+GB6�A�� G347:S8+AD?r;34M:>A�8

ALN6�I i G ¢y2K= i*¤ 4MI�8

A2 ID4MLN6MCP:V=BH<4M:ß@÷5?<8EA0A�6 ¤ 4A = �

à f � CK:<; 6X:<=B:<�*4MLNHBA�T 8-4\AA8-=RA+GB6�Ay� G34M: 8+AD?r;34M:>A�8

A2 LN6�I i G ¢25= i*¤ 47I�8AID47LF67CK:F=BH<4M: f

� ï_óæï �*ï�î �_ï7ö� � � �y6MI � 6M2 ¤ ß�� 4�4 ¤ 2 TNI�6�;BCK=�H<ID=3¥�I�6ML"àE¢ � =M� f ��� ¢r�M��� � ¢

http://cartalk.com/content/puzzler/transcripts/200546/f

�D� � � f �y6�HB2K6M:�6�:<;�� f ��=B8 ¤ =���C@A�Þ_¢ ° 3ê� ã�±�BêKç�â�é ª ä � �Må�ã�± � � å$¯_ç5è � ¢ � IDC@?<LFH<G¡M4M6MIE:BCP:<¥�¢ � 4\� ��=BI ¤ ¢3�������B¢3H f � f� � � 7zf ¡M47CKJ<=���C�A�Þ_¢ � ��I�C@ADCP:<¥F;>CK8 i ID4�AD472 T��M¢0k5ID=BL � f 4 f�7 =B894M:38EAE4�CK:y¢�4�; f ¢ ��çPé�âDä+ã�ê�ã° Bê�yã�±�3êKç�âæéXç5è�ê�yã � â � � � åPé ¢ g LF4MI�C i 6�:��w67A+G347LF6�ADC i 6M2 � = i C54\A�T ¢ Ù � � g � �8-47IDCK4M8\¢�¦�=>2 f � �3¢ �M��� � ¢BH f ��� f� ��� � fM� =BIEID47: i 4>¢ � � ò7AE47:<;BCP:<¥�A+G34$25= i*¤ 47I0H<ID=3J>2547L��M¢ ° 3ê� ã�±�BêKç�â �ç5è � � �Bâ 3êKç � è

�è�� ��ã_é�ã �ä+â � ¢ ��� ì � ¢��*6�: f �M�����3¢BH<H f �>� ��� f�rID? i 4 � =BIDID4M: i 4 � AD6M: ��6�¥7=B:Ù 4MH36�IæAEL�47:>A�=>k��w6�A+G34MLN67ADC i 8 Ù 47H<6MI�AELF4M:>A�=>k��w6�A+G34MLN67ADC i 87 6�:<;3=>2KH<G3�\�w6 i =B:��y=>2P2K4�¥74 �w6 i 6725478+AD4MIz��=>2@254M¥74g 8-G>2P6�:<; ¢�¦ g � � ��� � � A f 1>6M?32�¢ � � � ��� � �Ú �\g Ú �\[email protected] [email protected]

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n?<:F4M:>ADCK4MI�Hr=B8+C@ADC@k f� C

α = 1 +1

12(n + 1)

¢BLF=B:>AEID4MI��>?r4

e <

(

(n + 1)2n+1

(n!)2

)1

2n

< eα ¢

áO¯ ë ± f�ª ä � � � é�«ã ��Mä ° ç �6«7å �[¬0ã�è â �_ã ��¬ ä 7é � ¯ � � � �J±��è>ç�ã f� =>C@A

n?<:N:<=BL�JBID4 47:>ADC547IzH<=B8*C�ADCPk f ��=B:>AEID4MI��>?r4⌊√

n +

n + 2 3√

n + 1

=

⌊√

4n + 4 3√

n + 2

⌋ ¢=�Ý? bxc ;��4M8+C5¥�:<4R2K6aH<6MI�ADCK4 47:>ADCDÝ47ID4 ;34 x

fáO¯ ë Ø f�ª ä � � � é�«ã ��MäT_3ç5ä �7ç@å�´�ç�â ��å ��¬ �Bâ �ä+ã\é�ê��� � �J±��è>ç�ã f

� =>C@Aa¢b4\A

cAEID=>CP8�:<=BL�JBID4M8�I��4M472P8�6�IEJBC�AEI�6MCPID4M8�AE4�2K8��>?r4

a2 + b2 + c2 = 9f��=B:>AEID4MI��>?r4

3 · min{a¢b¢c} ≤ 1 + abc

fáO¯ ë ¯ f�ª ä � � � é�«ã ��MäT_3ç5ä �7ç@å�´�ç�â ��å ��¬ �Bâ �ä+ã\é�ê��� � �J±��è>ç�ã f

� =>C@A A ={

z ∈ � ∗ :∣

∣z +1

z

∣ ≤ 2} f�� =>C@A

n ≥ 2?<:�47:>ADC547I f ��=B:>AEID4MI$�>?r4

8*Cαn ∈ A ¢B6M2K=BI�8 α ∈ A fáO¯ ë á f�ª ä � � � é�«ã ��Mä���ã � ä �Bã�²_é+ç5èyêKé+ç � Mé ��² � ã\é*é �å � è>ç �>ã ����ä �ãMâ+ã f

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ABC6\�B4 i

AB = ACf

� =>C@AD4\A

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BP4�A

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P8+C

PD + DC = PE + EBf

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ABC6\�B4 i

AB = ACf

� =>C@AD4\A

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P8+C

BD + DC = BE + ECf

áO¯ ë í f¦ª ä � � � é�«ã����ä ª ��å���ç � � �Må � ä�ç�� ��XêKåMè�êKç�â8®0è>ç$¯Mã\ä�é+çæê ����¬ � â � Bê � è � �¨¸ �® � � f

£ :�8+?<H<H<=B8-4��>?r4V2K4 i 4M:>AEID4�;B? i 4MI i 2K4�;<478N:<47?3kXH<=>CK:>A�8F;y§ ?<:�AEIDCP6�:<¥\2K4V8-4AEID=>?>�B4X8*?<I02K4 i 4MI i 2K4�CP:38 i I�C@A�;>? AEI�CK6M:<¥\254 f ��=B:>AEID4MI��>?r4X8-=B: 6M:>ADCKH<=3;<4X4M8EA0254�Hr=>CP:>A;<4 � 47?r47I+JB6 i G ¢ i § 478+A+�MÝ6��*;BCPID4R254�Hr=>CP:>A�;<4OAD6M:<¥74M: i 4 ;<478�;347?�ò i 47I i 25478 fáO¯ ë ² f�ª ä � � � é�«ã ��Mä ° Mä�çMèG²7ã�êKç(¯ ���¬��� ä�å � � � � �X±�MèBç�ã f

� =>C@Aa¢

c4\A

d;<478Ü:<=BLFJ3ID478ÜI��4M472P8ÜH<=B8*C�ADCPk58h6MI+J>C@AEI�67CKID478�AD472P8��>?r4

d = min{a¢b¢c¢d} f ��=B:>AEID47I��>?r4

a4 + b4 + c4 + d4 − 4abcd

≥ 4d[

(a − d)3 + (b − d)3 + (c − d)3 − 3(a − d)(b − d)(c − d)] f

áO¯ ë � f ª ä � � � é�«ã���Mä¶ � é�«ã ¸ �7çPé �o«� ��³R¬ MäEä*ã\ä � �8®�èBç(¯Mã�äæé*ç�êJ«ã ª � å�Bê�ãMâ �<è>ç �>ã �<ã��3ê 7å � ��è ã ��¬ Mä*âEã_å � èyã � � é �� ��è ã f

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1f ��=B:>AEID47I�B?r4

n∑

k=1

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=�Ý?an+1 = a1

fáO¯ ë � f8ª ä � � � é�«ã����ä²\çæê � �O¯ � è��ä � � � � ± «�è ã��é7êKç ��� � �X±�MèBç�ã �yã�ê�¬ � � � �è � è>çæê ��� �¬ �Bâ �ä+ã\é�ê��� � �J±��è>ç�ã f

� Ca¢b4�A

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a2(b + c − a)

b + c+

b2(c + a − b)

c + a+

c2(a + b − c)

a + b≤ ab + bc + ca

2

fáO¯ ë © f8ª ä � � � é�«ã����ä²\çæê � �O¯ � è��ä � � � � ± «�è ã��é7êKç ��� � �X±�MèBç�ã �yã�ê�¬ � � � �è � è>çæê ��� �¬ �Bâ �ä+ã\é�ê��� � �J±��è>ç�ã f

� =>C@Aa¢b4�A

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(c + a)2

b2 + ca+

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c2 + ab≥ 6

f

Page 47: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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AB = AC4�AQAE4�2"�B?r4n2�§ 6M:<¥\254

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AB67?r�9;3472DÝ6S;<4

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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

12(n + 1)

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e <

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(n + 1)2n+1

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< 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⌊√

n +

n + 2 3√

n + 1

=

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4n + 4 3√

n + 2

⌋ ¢� G34MID4 bxc ;<47:<=�AE478�A+G34RCK:>AD4�¥747IzH<6MI�A�=>k x fáO¯ ë Ø f ª ä � � � é�ã � � �O_3çKä ��çPå�´�ç�â �7å ���¬ �>â � Mä*ã_é7ê� � � ±�MèBç f

¡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

fáO¯ ë ¯ f ª ä � � � é�ã � � �O_3çKä ��çPå�´�ç�â �7å ���¬ �>â � Mä*ã_é7ê� � � ±�MèBç f

¡M4�A A ={

z ∈ � ∗ :∣

∣z +1

z

∣ ≤ 2} f ¡M4\A

n ≥ 2J34O6�: CP:>AE4M¥74MI f 1<ID=7�B4�A+GB6�A-¢

CPkαn ∈ A ¢�A+G347: α ∈ A fáO¯ ë á f ª ä � � � é�ã � � � �6µ�²_é+ç5èyêKé+ç � Mé �,² �yã_é9é 7å � èBç �ç ����ä+ã�ãMâ+ã f

¡M4�AABC

J<4Q6M:�CP8-=B8 i 4�25478�AEI�CK6M:<¥\254N��C�A+GAB = AC

¢�6M:<;�254\APJ<4Q6M:CK:>AD4MI�C5=BI�H<=>CK:>A f ¡M4�A�A+G34a2@CK:<478

BP6�:<;

CPCK:>AD4MI�894 i A�A+G34�=BH<H<=B8*C�AE4a8*CK;<478�6�AzA+G34Hr=>CP:>AD8

D6M:<;

E¢BID4789H<4 i ADC �B472 T f�� CK:<;�A+G34�2K= i ?<8�=>k

PCPk

PD + DC = PE + EBf

áO¯ ëOë f ª ä � � � é�ã � � � �6µ�²_é+ç5èyêKé+ç � Mé �,² �yã_é9é 7å � èBç �ç ����ä+ã�ãMâ+ã f¡M4�A

ABCJ<4Q6M:�CP8-=B8 i 4�25478�AEI�CK6M:<¥\254N��C�A+G

AB = AC¢�6M:<;�254\A

PJ<4Q6M:CK:>AD4MI�C5=BI�H<=>CK:>A f ¡M4�A�A+G34a2@CK:<478

BP6�:<;

CPCK:>AD4MI�894 i A�A+G34�=BH<H<=B8*C�AE4a8*CK;<478�6�AzA+G34Hr=>CP:>AD8

D6M:<;

E¢BID4789H<4 i ADC �B472 T f�� CK:<;�A+G34�2K= i ?<8�=>k

PCPk

BD + DC = BE + ECf

Page 48: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

áO¯ ë í f ª ä � � � é\ã�� ��� ª ��å ��ç������Må � ä�ç�� ��XêKå �èyêKç�â5®�èBç(¯Mã�äæé*ç�ê� ��¬ � â� � Bê � è � �¨¸ �® � � f

� ?<H<H<=B8-4�A+GB67A0A+G34 i 4M:>AEID4R=>kBA+G34R:BCP:<4��+Hr=>CP:>A i CPI i 254R=>k<6XAEIDCP6�:<¥\2K4X2PCK4M8z=B: A+G34CK: i CPI i 254R=>kBA+G34�AEIDCP6�:<¥\2K4 f � G3=��hA+GB6�A�C�AD8�6�:>ADCPHr=3;B6M2BHr=>CP:>A�CP8�A+G34 � 4�?r4MIEJ36 i G�1B=>CK:>A `A+GB67A�CP8�¢BA+G34 Hr=>CP:>A�� G347ID4aA+G34 :BCK:<4M�*H<=>CK:>A i CPI i 254 6M:<;NA+G34aCK: i CPI i 254 6�ID4�AD6M:<¥74M:>AzAD=4M6 i GF=�A+G347I fáO¯ ë ² f ª ä � � � é�ã � � � ° �ä�ç �è?²Mã�êKç$¯ ��¬��� ä�å � � � � ±��è>ç f

¡M4�Aa¢b¢c¢dJ34"6M:�TQHr=B8+C@ADC �B4�ID4M6720:B?<LFJ<47I�8$��C@A+G

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

áO¯ ë � f�ª ä � � � é\ã�� ���¦¶ � é�«ã ¸ �7çPé �o«� ��³R¬ MäEä*ã\ä � �C®0è>ç$¯Mã\ä�é+çæê 3ê ª � åPç�ê��ã�âDè>ç�â �<ã��3ê 7å���è � ���¬ Mä*âEã_å � è � � ���ç5è f

¡M4�Aa1¢a2¢. . .¢anJ34aID476M2r:B?<L�J34MI�8\¢<476 i GN¥�ID4767AD4MI�A+GB6M:

1f 1<ID=M�B4OA+GB67A

n∑

k=1

(

1 + logak(ak+1)

)2 ≥ 4n¢

� G34MID4an+1 = a1

fáO¯ ë � ftª ä � � � é�ã � ���`²�ç�ê ���"¯ � è Mä ��� � � ± «Mèyã��é�êKç � � � ±�MèBç �� Mè �5¬ � � � Mè � è>çæê ��� �¬ �Bâ ���ä+ã\é�ê��� � ±�MèBç f

� ka¢b¢B6�:<;

c6MID4aH<=B8*C�ADC��B4�ID476M2r:B?<L�J34MI�8\¢3H3ID=M�B4RA+GB6�A

a2(b + c − a)

b + c+

b2(c + a − b)

c + a+

c2(a + b − c)

a + b≤ ab + bc + ca

2

fáO¯ ë © ftª ä � � � é�ã � ���`²�ç�ê ���"¯ � è Mä ��� � � ± «Mèyã��é�êKç � � � ±�MèBç �� Mè �5¬ � � � Mè � è>çæê ��� �¬ �Bâ ���ä+ã\é�ê��� � ±�MèBç f

¡M4�Aa¢b¢B6�:<;

cJ<4OA+G34�2K4M:<¥_A+GB8$=>krA+G34a8+C5;34M8$=>k 6�AEI�CK6M:<¥\254 f 1<ID=M�B4OA+GB67A

(b + c)2

a2 + bc+

(c + a)2

b2 + ca+

(a + b)2

c2 + ab≥ 6

fáO¯ í ± f ª ä � � � é�ã � � � �~µ ¶Jµ � ±�ãMã�è � ���åæê � � ±�±�ã-å ��ê� ã`´aã�ê� ã�ä�å �è���é f

¡M4�AABC

J34R6M:�CK89=B8 i 472K4M8�AEI�CK6M:<¥\254$��C�A+GAB = AC

6M:<;∠BAC = 100◦ f¡M4�A

DJ34FA+G34�H<=>CK:>Aa=B:SA+G34QH3ID=3;B? i ADCK=B:w=>k

AB8+? i GSA+GB67A

AD = BCf � CP:<;

∠ADCf

Page 49: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� �3�

�h� � � ��� � �

´ � �yä � �Må�ã�±¿çKé�ã3¯Mã�ä���ã�äU±�Mèyã\è�êKå �Fâæå � é\ã���µ�² �yã"ã ��çæê � ä�çPé��å$­ ��Mé �rå�ã Mé\ã��ê � â � èBé*ç �<ã�ä � � ä�� � �MåPç�â�BêKç � èNèyãJ­né � å �BêKç � èBé � äzèyãJ­jçKè3é+ç � ��êPé � è���7é7ê �yä � �Må�ã�±NéJµ

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

¡M4�Aa1J34�6F:<=B:<�EÞ*47ID=VID476M2�:B?<LFJ<47I-¢�6M:<;�;<4��r:<4�A+G34F8-4M�B?r47: i 4 {an}∞

n=1JMTan+1 = n2/an

ku=BIn ≥ 1

f 1<ID=7�B4RA+GB6�AN∑

n=1

1

an

=

(

1

πa1

+πa1

4

)

ln(N) + O(1)f

��� å��3êKç � è ���t¶ � ã-å � â �>å � é��3ã�ä ����¬ ��Mé+ç��<ã ��´ ����® � ����± � ��ç��yã�� � ��ê�yã ã ��çæê � ä f� A�CK8�8EAEI�6MCK¥7G�ADku=BIæ�a6MID;"AE="H<ID=7�B4 JMT�CP:<;B? i ADCK=B:�A+GB6�A�ku=BI

n ≥ 0¢

a2n+1 =

(

22nn!2

(2n)!

)2

a1f

g�i+i =BID;BCP:<¥XAE= � ADCPID2@CK:<¥�§ 8 � =BIEL�?32K6B¢n! =

√2πn

(

n

e

)n[

1 + O(

1

n

)] ku=BIn → ∞ f

� G347ID47ku=BID4>¢Bku=BIn ≥ 1

¢

22nn!2

(2n)!=

22n2πn(

n

e

)2n

2π(2n)(

2n

e

)2n

[

1 + O

(

1

n

)]

=√

πn

[

1 + O

(

1

n

)] f

� G347:y¢Bku=BIn ≥ 1

¢1

a2n+1

=1

πna1

[

1 + O

(

1

n

)]

=1

πa1

[

1

n+ O

(

1

n2

)]

6�:<;1

a2n+2

=a2n+1

(2n + 1)2=

πna1

4n2(

1 +1

2n

)2

[

1 + O

(

1

n

)]

=πa1

4n

[

1 + O

(

1

n

)]

=πa1

4

[

1

n+ O

(

1

n2

)] f

Page 50: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

� G347ID47ku=BID4>¢Bku=BIN ≥ 4

¢N∑

n=1

1

an

=1

a1

+1

a2

+

bN−1

2 c∑

n=1

1

a2n+1

+

bN−2

2 c∑

n=1

1

a2n+2

=1

πa1

bN−1

2 c∑

n=1

[

1

n+ O

(

1

n2

)]

+πa1

4

bN−2

2 c∑

n=1

[

1

n+ O

(

1

n2

)]

+ O(1)

=

(

1

πa1

+πa1

4

)

lnN

2+ O(1)

f� =�ADCP:<¥�A+GB67A

ln(N/2) = ln N − ln 2 = ln N + O(1)¢�� 4R6MIEI�C��B4R6�A�A+G34a;34M8+CKID4M;ID4M8+?32@A f

��� ���l���������a ��dNd�R���H 3D o �EI2���+D#DB �$J�9�3Q#�(B$G=�1R&�(')�h8�����DBIB�! [������CH<i57"�$g5'1��.Q�� S (��(��p���FZ(3&���S+Q�FJ$�� (3(#�� �1LQ#)+q�$3��Q���P 1RS &�8'&�('�ZP *'E]�12�.]K�����1��

�������� ��������������������������! #"%$�&'$�(�)�*,+�-/.1032546)87:9<;�=>;?0@7A7B)DCFE'$#G�)�H�C:I�"�;�H<2J)��K�L?M

ε N LOMJP�LQL?R@RASUT�V8L x2

a2+

y2

b2−1 = 0

�XWZY�[ T�\�]�\�RAR>L?R�M�\�^�_�L�^ZM5VXM [εS@^ZM`L�]�V8L�a5M

\bMJPZS@]5c!M5\�^�_�L�^ZMO\�MM1(x1, y1)

\�^�cM2(x2, y2)

�Fd P [�Y MJP�\?MFMJP�L�eZ\�R@f#L [Zg(

x21

a2+

y21

b2− 1

)(

x22

a2+

y22

b2− 1

)

SUVhS@^�c�L�T#L�^�c�L�^ZM [Zg MJP�L�a%P [ ViL�^!M�\�^�_�L�^ZM5V �j 2`$�kl+�0>H�;�=U03$�Hm$�no(J0>k/0A7>;�"p(�$�7�G�=U0B$�H�(�+�- j &'$�(�=3$�7@0@(�qorOs�)�k/0U(%Cut�;�"%v�;�w�)80B$yxp0Uz�4{ 254<$�$�7UC j =|4<)?H�(iC:}X"%)�)�2`)D~6;�H<*, #)�=B)�"���rF�!$�$�C:9�03$�7>;l�XH�03v�)?"�(%0B=|-�CF��;!.y0>"�;�*Z;�CF� j C� { j �

� L�V8P�\�R@R'V8L�L!MJP�\�M g|[ ]p\�RARFa%P [ SUaJL�V [Zg MJP�L/MJP�]5L�L!M5\�^�_�L�^ZM�V � MJP�L�T�] [ c�f#a5MpS@^� f#L�VJM5S [ ^!SUVh\�R Y \���V

1� � Lbc�L�^ [ M5L N � O

MJP�L�a`L�^ZM`]5L [Zg MJP�Lb_�S�e�L�^�L�RAR@S@T�ViL � \�^�c N �C1

�C2

� \�^�cM

MJP�L�T [ SU^ZM�V [Zg M�\�^�_�L�^�a�� [Zg MJP�L�MJP�]5L�L�M5\�^�_�L�^ZM�VC1M1

�C2M2

�\�^�c

M1MM2

�W P�L�\��,^�L�M`]�\�^�V g|[ ]`��\�M5S [ ^

(x, y) →(

x,a

by) M`]�\�^�V g|[ ]5��V�MJP�L�_�S e�L�^

L�RAR@S@T�ViLM [ MJP�Lua`SU]5a`RUL Y S�MJP!a`L�^ZM`]5LO\�^�c!]�\�cZS@f�V

a�o� MF\�R@V [ M`]�\�^�V g|[ ]`��VoMJP�L�T [ S@^ZM5V

M1(x1, y1)�

M2(x2, y2)�

C1

�C2

� \�^�cM

M [ MJP�L�T [ SU^ZM�VM ′

1

(

x1,a

by1

) �M ′

2

(

x2,a

by2

) �C′

1

�C′

2

� \�^�cM ′

� ]5L�V%T#L�a5M5S�e�L?R�� � \�^�c�S�M'M`]�\�^�V g|[ ]`��VoMJP�LM5\�^�_�L�^ZM�VC1M1

�C2M2

� \�^�cM1M2

[Zg MJP�L�L?R@RASUT�V8L�M [ MJP�LuM5\�^�_�L�^ZM�VC′

1M ′1

�C′

2M ′2

� \�^�cM ′

1M ′2

� ]5L�ViT�L�a5M5S e�L�R � ��[Zg MJP�L�a`S@]5a`R>L �� [ ^�ViL � f#L�^ZM5R � �M ′

1O ⊥ M ′2O �>N S@V8L�a5M [ ]�V [Zg ∠C′

1OM ′ \�^�c∠M ′OC′

2

�Y P�L�]5L∠C′

1OM ′ + ∠M ′OC′2 = π � � \�^�c OM ′ ⊥ M ′

1M ′2 � V%S@^�aJL M ′

1M ′2

S@V

Page 51: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� �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

��� ��� ���������f ������!�R,a��59��IB�U"�$MNeS �2���3Q�1RSE"#�3QBPU*��1�(l"BP &BP+�5'(#SU���1R��SUPU�.$��.�.][� S (#$iN%<9$J5K"L��8�M�ED#I��H 3�����ECH<@5K".$ 5'1��.Q�� S (��(#p���FZ(#&���SQ�FJ$G� (3(#�� �1LQ#)+q�$H�MQ���PU1RS &.8T�������������-���!�! #"�"�$J�'&�(�)R*��,#&��U���\/'�12�3���$@����$X57"��98���<> [DG"#���HD#<�" o [��:�$ o &�����S�3L$�CH?3$X57"��98��i� ���9"BNd 3 3C!A�$>k.&.�P+ 3��FZFGL� $PU*�iC!�PU*��1R� &�('����8�&�(��ZPU*�E]�12�.]K�����1��

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a1

�a2

�. . .

�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�

{ $�7�G�=U03$�H +�- ��;?7�=|4<)?"��8;�H<$#G�(%C ��"5(�G�7A0>H<)?H�z�-�k�H�;�(%0�G�k�C��3H�H�(?+�"DG�25w�C j G�(?=|"�0>;�Ck $�*�06)�*,+�-/=|46)�)�*�0B=B$�"D�� L Y SAR@R�\�T�T�R �pMJP�L g|[ RAR [�Y S@^�_FMJP�L [ ]5L�� [ ^ba [ ^�e�L�� g f�^�a5M5S [ ^�V [Zg PZS>_�P�L�] [ ]5c�L�]

� ViL�L � Z� T�T �Z������� � �������������� � K�L�MI N L�\�^ [ T�L�^�SU^ZM5L�]3eZ\�R � \�^�c�RUL?M f : I → � N L�\ g f�^�a5M5S [ ^ Y PZSUa%PSUV

n � M5SU��L�VQc�S���L�]5L�^ZM5S@\ N R>L �'W P�L g|[ R@R [�Y SU^�_�VJM�\�M5L���L�^ZM�VQ\�]5L�L � f�S eZ\�RUL�^ZM �

� S � �|g x0

�x1

�. . .

�xn

\�]5LQ\�^��n+1

cZSUV`M5SU^�a5MXT [ S@^ZM5V'S@^I� MJP�L�^ n

i=0

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

�/W P�L�^f (n−1)(x) = (n − 2)!/xn−1 > 0

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

�. . .

�an

_�S�e�L�^�SU^!MJP�L�T�] [ N R>L�� ��Y LR>L�Mw(x) =

n∏

j=1

(x − aj)�'W P�L�^ g|[ ]hL�\�a%P

i = 1�2�. . .

�n��Y L�P�\�e�L

w′(ai) =∏

j 6=i

(ai − aj) = (−1)n−1pi

Page 52: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� ���

g�i+i =BID;BCP:<¥OAD= i =B:<;>C@ADCK=B:FßPC�à�CP:"A+G34RA+G34M=BID4ML�¢ n∑

i=1

f(ai)

w′(ai)> 0

f�� G34M:n∑

i=1

ln ai

pi

= −n∑

i=1

(−1)n ln ai

(−1)n−1pi

= −n∑

i=1

f(ai)

w′(ai)< 0

f

� 6 ¤ CP:<¥a4+ò�H<=B:<4M:>ADCP6M2P8�¢�� 4a=3J�AD67CK: n∏

i=1

a1

pi

i < 1f

� ï_óæï �*ï�î �_ï7ö� � � ��C@AEI�CK:<=7�BC i ¢ ÙRf �<f ¢ �>å Mé*é*ç�â��å Mè � ´aãJ­ uèyã� � �åPç�êKç�ã_éQçKè ��è�7å �Mé+çKé ¢ �y2P?>� 47Ig�i 6�; f 13?rJ>2 f ¢ Ù =BID;BID4 i G�A-¢ �����>� f

��� ���!���������Z ��#��<> [D!"3���!D3<�" o 3��:�$ o &�����SU�3L$7CH?3$E5K"L��8�&�('�ZPU*�E]�12�.]K�����1��

�����b���/ 5������� ���������6�?����� #"J$�&'$�(?)�*l+�- �?$�( �)/��G�0@(�s �� ;�� ! 9<;�"`"%)�"%$�C���HZ0Bv�)�"�(J0�=U;�= #$�7@0B=��)�25HZ0B2�;�*�)���;�=U;�7�G�H�-�;�CF9<;�"%2`)D73$�H�;�C { &6;?0>HX�K�L?M

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

{ $�7�G�=U03$�Hl+�-/.y0B254<)D7:9<;�=>;?0@7A7B)DCFE'$#G�)�H�C:I�"�;�H<2J)DCXk $�*�06)�*,+�-�=|4<)�)�*�0B=B$�"D�� ]5S�M`L�MJP�LbRUL g MoV%SUc�Lb\�V

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

� L�a5\�^�VJSU��T�RAS g �S2 N ����\�$�SU^�_�f�V8L [Zg MJP�LuS>c�L�^ZM5S�MB�

x2y2(y−x)+y2z2(z−y)+z2x2(x−z) = (x−y)(y−z)(z−x)(xy+yz+zx).

�OS�eZS>cZSU^�_ N [ MJP/VJS>c�L�V N � (x − y)(y − z)(z − x)\�^�c/ViL?M�M5S@^�_

x =√

a�y =

√b�

\�^�cz =

√c��Y L [ N M5\�SU^

S2 =√

ab +√

bc +√

ca�

W PZf�V � MJP�L�_�S�e�L�^�S@^�L � f�\�RASAM3�!M5f�]5^�V [ f�MFM [ N L�L � f�S�eZ\�R>L�^ZMFM [abc

(√ab +

√bc +

√ca)

< a4 + b4 + c4� � �

Page 53: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

� =���¢>k5ID=BL A+G34��S4�C5¥7G�AD4�; g � 4�� � :<4M�B?<672PC�A�T ¢�� 4aGB6\�B4a

3

2 b3

2 c = (a4)3

8 (b4)3

8 (c4)1

4 < 38a4 + 3

8b4 + 1

4c4

ß@� G347ID4OA+G34OCP:<4��>?<6M2@C@A�T�CK8z8EAEIDC i A�J<4 i 67?<8-4a¢b¢>6M:<;

c6�ID4�;>CK8EADCK: i Aæà f�� CPLNC@2K6MID2 Ty¢7� 4GB6��B4

a3

2 bc3

2 < 38a4 + 1

4b4 + 3

8c4 6�:<; ab

3

2 c3

2 < 14a4 + 3

8b4 + 3

8c4 f � k � 4a6�;3;6M2@23A+GBID4�4�CP:<4��>?<6M2@C@ADCK4M8\¢�� 4a=3J>A�6MCP:Fß � à f� =�AD4FA+GB6�AOA+G34�ID4M8+?32@A�6 i AD?<6M2@2�T�G3=>2K;38R� G347:<4-�B4MI

b¢�6M:<;

c6MID4Q;BCP8+ADCP: i AHr=B8+C@ADC �B4�ID4M672 :B?<LFJ<47I�8 f

��� ���M���������H ��>����A�����?i�ED#I2$["�&�(<������L$7����$�57"��987���!�R,j��5���I��".$�NeS �2���3Q�1RS#"#�3QBPU*��1�(X"BP &BP+57(BS���1R��SP ��$��.�.][� S (#$�N%<9$H57"��98��������������0���>�! #"�"�$��'&�(')+*'�T,#&.����Z/'�12�3���$@����$H5K"L��8�����DBIB�! [�����CH<i57"�$Z5'1��.Q�� S (��(#p���FZ(#&���SQ�FJ$!�U(#(3�� �1LQB)Rq�$���Q���P 1RS &�86��<� 3DT"#���HD#<�" o [��:�$ o &�����S�3L$!CH?3$J5K"L��8,7 7I� [�f?9���J<E<K$ o S��� &g5'(#SU���1R��SUPU�.$KD�&XNeS 1R&B��&�$9����$E57"��98'&�('�ZP *'E]�12�.]K�����1��

"#����1R&�����������1R��FG�(�P SU��('��!PU*#&#P'PU*��12��.Q.�PBS ��P 1LQ#��+��1K&�([�!P *312����S ��P S (')�PB]K����SP S���12�&.�B(7Q�F� 3�1R���JNd����P���������1R�! 3Lp�&�(#$9� S q3 o &BP &.S � �L$� ��J�2*��B^�S (BpGP *3&BPEP *'ip�SU���(jS ('��[Q�&�� SP �XS �H��[Q.S�L&��U�('P�P�abc(

√ab +

√bc +

√ca) < a4 + b4 + c4

�'�EPKPU*#&#P3]K��S ('P $KP *'�12M^@�12�������1R&.��^E&����EP+�H)���FX][�U�P+PU*�M�����+QBP SU��(K�?�h&�(��3Q���]�12�B�LS�3��!������1R&.�[�.QB)R*j^E&�����*BS FZ��L� ����������u�� ���������������������� ?� #"%$�&'$�(�)�*,+�-/.y0>4 �;?7|-�9�)�H62 �D)DCF9<"�;�(�$�v�CFE'$�k�;�HZ0>;��

�|gxk > 0

g|[ ]k = 1

�2�. . .

�n� T�] [ e�L�MJP�\�M

� \ � 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

� *�0B=B$�"� (�2J$�k�k )�HX=5�&Q^ g|[ ]�M5f�^�\?M`L?R�� � MJP�L�SU^�L � f�\�R@S�M5S>L�V�\�]5L�SU^�a [ ]`]5L�a5Mu\�VbVJM�\�M5L�c ��<[ MJP � \�R�MJP�L�]

�%\�^ [ f�V � &Q]5V%f�RASU^�L�^�_8����^�\�VJS@f�� �� ^�^�V N ]�f#a�$ � f�VJM`]�SU\ \�^�c � L�M`L�]� � � [�[<�� S [ RU\&Q^�S�e�L�]�V%S�MB� � K�\��yS@]�\�c�\ � � � & d _?\�e�L�a [ f�^ZM`L�]5L���\���T�R>L�Vb\�^�c MJP�L�^l\?M�M`L���TZM`L�cM [ SU��T [ ViL�\�c�c�S�M5S [ ^�\�RF]5L�VJM`]�S>a5M5S [ ^�V [ ^ MJP�L/eZ\�]5S@\ N R>L�VuM [ ��\�$�L/MJP�L�SU^�L � f�\�R@S�M5S>L�Va [ ]5]5L�a5M � �%\�^ [ f�V�V%f#a`aJL�L�c�L�clSU^�]5L�T�\�SU]�SU^�_�T�\�]�M � \ � � � [�[�� V�a [ f�^ZM5L�]5L%��\���T�RUL g|[ ]T�\�]�M � \ � SUV n = 2

�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

�{ $�7�G�=U03$�H =3$ ;Z*��8G�(�=3)�* &6;�"8= � \ � +�- ��;?7�=|4<)?" �8;�H<$#G�(%C��X"5(�G?7@0UH6)�H�z�-�k�H�;�(J0�G�k�C�3H�H�(?+�"DG�25w�C j G�(?=|"�0>;��

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�

Page 54: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

Ú 8*CP:<¥R6 i =BLFHB?BAE47Iz6M2K¥74�JBI�6 8�TB8+AD4ML�¢�� 4 i 6M:F89G3=���A+GB6�A

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

��� å��3êKç � èSê � ��� �Mé�ê�ã � ��Mä-ê ß5J�à � ��ê�yãaã���ç�ê � ä �Mé+ç5è �Rç��<ã Mé ��� ê� ã �yä � � � é�ã\ä f¡M4�A

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

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

¢k5ID=BL � G>C i G�A+G34RCK:<4M�B?<672PC�A�T"CK:NH36�IæA�ßuJ�à�ku=>2@25=��a8zCPLFLF4�;>CK6�AE4�2�T f�����!�u�� ���������������������� ?� #"%$�&'$�(�)�*,+�-/.y0>4 �;?7|-�9�)�H62 �D)DCF9<"�;�(�$�v�CFE'$�k�;�HZ0>;��

� [ ]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

{ $�7�G�=U03$�H,+�-�E60B254�;�"J* �5r#x�)�(%(iC�E6;�H<2546$! �;�73$�(ut#)?"J*�)�(%C'� j Ch� { j C�k $�*�0 X)�*/+�-�=|4<))�*�0B=B$�"D���L���^�L

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�

Page 55: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

� =�� 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

��� ���!���������Z ��h�M�ED#I��H 3�h���ECH<@5K".$E5'1��.Q�� S (��(#p���FZ(#&���SQ�FJ$K�U(#(3�� �1LQB)Rq�$3�MQ���PU1RS &[��L&�('�3Q����������Q#P S��(B$G^E*BS)+*;S �e �&�����a��(6)���FX]9Q#P�1 ���1RS V7)&#P S��(#��$\&B)2PRQ�&.� � �;���P &B �� S �2*'��TPU*���PU12��(Bp#�1XS (���[Q�&.� SUPU� n

k=1

k√k

k2< Rn

� o �#P *u�L&�('�3Q��j&�(��%�!��2� 3L� S���TPU*#&#PXP *'gFJS (BS FgQ�F � �Rn − Ln

S �i&BPRP &�S ('��g^E*��(n = 8

8MPU*'Q���$Ln ≤ Rn − 0.4409

^E*'�120.4409 ≈ R8 − L8

$ [Q#P9P *'��@p�&#��M(��@]�12�#� ���EI�*�M�����Q#P S��(j ��XP *'�]�12�.]K�����1�&.]3][� S��!��S FX][�iPL����)��.][S (BpXP��p#�P *'�1>^�SUPU*PU*�@S (���[Q�&.� SUPU�

an < n + 1 + 1

2(ln n)2

$�^E*#SU)R*\*'H)+� &�S FG��j)&�( 3@�2*'�B^E(g ��!S (��[Q#)�P SU��( [Q#P���SU�('�#P7�.Q�]3][� �i&�([�@]�12�#� ���

����� �/�� ���������������������� ?� #"%$�&'$�(�)�*,+�-/.y0>4 �;?7|-�9�)�H62 �D)DCF9<"�;�(�$�v�CFE'$�k�;�HZ0>;��K�L?M

A�B ∈ Mn(

�)� \�^�c/RUL?M

ω = e2πi/n� � ] [ e�LuMJP�\?M

n∑

k=1

det(A + ωk−1B) +

n∑

k=1

det(B + ωk−1A) = 2n(det A + det B)�

� *<r�W P�L�T�] [ N R>L�� P�\�V N L�L�^ a [ ]5]5L�a5M5L�c/M [ VJM�\�M5LbMJP�\�M ω = e2πi/n� \�V�MJP�LT�] [ T [ V8L�]FS@^ZM`L�^�c�L�c � ]�\�MJP�L�]:MJP�\�^

ω = e2π/n��W PZS@V�a [ ]5]5L�a5M5S [ ^ Y \�Vh��\�c�L N ��MJP�LV [ R e�L�]�V � �

{ $�7�G�=U03$�Hl+�-/.y0B254<)D7:9<;�=>;?0@7A7B)DCFE'$#G�)�H�C:I�"�;�H<2J)��� [ ]

M ∈ Mn(�)�#Y L�c�L�^ [ M5L N � M (1)

�M (2)

�. . .

�M (n) MJP�L�a [ RAf���^�V[Zg

M� K�L�M

x N Lu\�^�SU^�c�L?M5L�]5��S@^�\�M5L �Fd S@^�aJLu\�^ n × nc�L?M5L�]5��S@^�\�^ZM:SUVO\�^

n� RASU^�L�\�]g f�^�a5M5S [ ^ [Zg SAM�VQa [ RAf���^�V ��Y L�a`\�^,L%��T�\�^�c

det(A + xB)\�V g|[ RAR [�Y V �

det(A + xB) = det(

A(1) + xB(1), A(2) + xB(2), . . . , A(n) + xB(n))

= det(

A(1), A(2), . . . , A(n))

+

n−1∑

j=1

αjxj

+ xn det(

B(1), B(2), . . . , B(n))

= det A +

n−1∑

j=1

αjxj + xn det B

Page 56: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

� G34MID4α1¢α2¢. . .¢αn−1

6�ID4 i =BLNH32K4*òF:B?<LFJ<47I�8aßPCK:<;34MH<4M:<;34M:>AR=>kxà f�� 6 ¤ CK:<¥

x = 1¢ω¢ω2 ¢ . . .

¢ωn−1 CK:N8+? i+i 4M8*8*CK=B:N6M:<;N6�;<;>CK:<¥XA+G34aID478*?32�AD8\¢�� 4 =3J�AD67CK:

n−1∑

k=0

det(A + ωkB) = n det A +

n−1∑

k=0

n−1∑

j=1

αjωkj +

n−1∑

k=0

ωkn det B

= n det A +

n−1∑

j=1

αj

n−1∑

k=0

ωkj +

n−1∑

k=0

ωkn det Bf

� =���¢�8+CK: i 4ωn = 1

6M:<; n−1∑

k=0

ωkj =1 − ωnj

1 − ωj= 0

ku=BIj = 1

¢2¢. . .¢n − 1

¢� 4 GB6\�B4

n−1∑

k=0

det(A + ωkB) = n(det A + det B)f

� G347: n−1∑

k=0

det(B + ωkA) = n(det B + det A)¢B6M:<;"A+G34aID478*?32�A�ku=>2P2K=��a8 f

��� ���@�����U����H ��!,7 7I� [�T?9�?�J<E<K$ o SU��� &\57(BS���1R��SP ��$�D�&iNeS 1R&B��&�$K����$>57"��983&�(��XPU*��]�12�.]K�����1��

������� ? � ����������O��� ���p�?� �� #"%$�&'$�(�)�* +�- �#G�k/0UH�z���4<)?H�C,�u0A7Un>"�0B* ��;�G�"�0B)�"��HZ0Bv�)�"�(J0�=>-�Ch��;�=3)?"�73$�$�C������K�L?M

f(x) = x − c2 tanh x�XY P�L�]5L

c > 1S@V�\�^y\�] N SAM`]�\�]3�ya [ ^�V`M5\�^ZM �1� MSUVQ^ [ M�P�\�]5c/M [ V8P [�Y MJP�\�M

f(x)S@Vc�L�aJ]5L�\�V%S@^�_ [ ^/MJP�L�S@^ZM`L�]3eZ\�R

[−x0, x0]��Y P�L�]5L

x0 = ln(

c +√

c2 − 1) S@VQMJP�L�T [ VJSAM5S e�L�] [�[ M [Zg MJP�L/L � f�\?M5S [ ^

cosh x = c� � [ ]L�\�a%P

x ∈ (−x0, x0)� MJP�L�P [ ]5S � [ ^ZM5\�R#R@S@^�L�T�\�ViVJSU^�_�MJP�] [ f#_�P (

x, f(x)) S@^ZM`L�]�V8L�a5M5VMJP�L�_?]�\�T#P [Zg

f\�M:M Y�[/[ MJP�L�]oT [ SU^ZM�V Y SAMJP!\ N Via`SUV%Vi\�V x1(x)

\�^�cx2(x)

� ��L �#^�Lb\g f�^�a5M5S [ ^g : (−x0, x0) → � \�V g|[ RAR [�Y V �

g(x) = x + c2 tanh(

x1(x))

+ c2 tanh(

x2(x))

�� ] [ e�L [ ]hcZSUV%T�] [ e�LuMJP�\?M

g(x) > 0g|[ ]o\�RAR

x ∈ (0, x0)�

� *�0B=B$�"� (oH6$�=3)����[ V [ RAf�M5S [ ^�V Y L�]5Lp]5L�aJL?S�e�L�c g|[ ]6MJPZSUVFT�] [ N RUL��� P�L�^�aJL � SAM']5L���\�SU^�V[ T#L�^ �'W P�LuT�] [ T [ ViL�] N L�RAS>L8e�L�VoMJP�\�M'MJP�Lba [ ^�3L�a5M5f�]5LuS@VoM`]�f#L � VJSU^�a`LpMJP�L�]5LuS@Vh\���T�R>LL���T�S@]5SUa`\�R6L8eZS>c�L�^�a`L �

� �������������������������! ���"#�%$'&)(+*-,*�.%/�0�1�2�3!4-.65879/;:)<= (?>@*�4BA+/�CEDGFH59I�/�(J.+5K>L2M*�N#&O79*�5@/�.%>P5PCQ *�RS4�F!5P4#�T�U%V

p > 1 !W�X#Y[Z U%V

a b c d ∈

[

1/√

p,√

p]

� \#]�^-_ UMV+` W Va W�b p

1 + p+

2

1 +√

p≤ a

a + b+

b

b + c+

c

c + a≤ 1

1 + p+

2√

p

1 +√

p caLd b p

1 + p+

3

1 + 3√

p≤ a

a + b+

b

b + c+

c

c + d+

d

d + a≤ 1

1 + p+

3 3√

p

1 + 3√

p

Page 57: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� �B�

��� å��3êKç � è ������ä ������å�ê� � Mè`¶ � é\ã ��������® � ����± � ��ç ��ã � � ��ê�yã ã ��çæê � ä fß56\à � G34OAEI�6�:38*Hr=B8+C@ADCK=B:

(a, b, c) 7→ (b, a, c)CP:"A+G34�CP:<4��>?<6M2@C@A�T

a

a + b+

b

b + c+

c

c + a≤ 1

1 + p+

2√

p

1 +√

p

ß � à¥\C��B478�A+G34a4��>?3C��>672547:>AzCP:<4��>?<6M2@C@A�T

b

b + a+

a

a + c+

c

c + b≤ 1

1 + p+

2√

p

1 +√

p

f� CK: i 4

a

a + b+

b

b + c+

c

c + a= 3 −

(

b

b + a+

a

a + c+

c

c + b

) ¢� 4a894�4OA+GB6�A�ß � à�CK8�8*67ADCP8*�r4�;"C@ky6�:<;N=B:B2�T"CPk

a

a + b+

b

b + c+

c

c + a≥ 3 −

(

1

1 + p+

2√

p

1 +√

p

)

=p

1 + p+

2√

p

1 +√

p

f� G>?<8\¢>AD=�H3ID=M�B4 ßK6�àE¢BC�A�CP8�8*? � i C547:>A�AE=�H3ID=M�B4 ß � à f¡M4�A

x = b/a¢y = c/b

¢36M:<;z = a/c

f�� G34M:Fß � à�J<4 i =BLF4M81

1 + x+

1

1 + y+

1

1 + z≤ 1

1 + p+

2√

p

1 +√

p

f ß��_à� =�AD4�A+GB6�A

xyz = 16M:<;

x¢y¢z ∈ [1/p, p]

fF� =SH<ID=7�B4�ß � à+¢0C�AXCP8a8+? � i CK4M:>A�AD=H<ID=7�B4 ß��_à�ku=BIz672P2r8+? i Gx¢y¢B6M:<;

zf�BT A+G34O8�T3LNL�4\AEI�T�CP:�ß��_à*¢7� 4OLF6\T"6M898+?<L�4�A+GB6�A

z = max{x¢y¢z} f�� G34M:y¢8*CP: i 4

xyz = 16�:<;

z ≤ p¢�� 4aL�?<8+A�GB6\�B4

1 ≤ z ≤ p6M:<;

1/p ≤ xy ≤ 1f ¡M4\A

t =√

xyf�� G347:

t2z = 16�:<;

1/√

p ≤ t ≤ 1f � CK: i 4

x + y ≥ 2√

xy = 2t¢� 4 GB6\�B4

1

1 + x+

1

1 + y=

2 + x + y

1 + x + y + xy= 1 +

1 − t2

1 + x + y + t2

≤ 1 +1 − t2

1 + 2t + t2= 1 +

1 − t

1 + t=

2

1 + t

f ß � à� 47: i 4>¢

1

1 + x+

1

1 + y+

1

1 + z≤ 2

1 + t+

1

1 + z=

2

1 + t+

t2

1 + t2f

¡M4�Ah(t) =

2

1 + t+

t2

1 + t2f � CK: i 4

h′(t) =−2(1 − t)(1 − t3)

(1 + t)2(1 + t2)2¢<C�A�ku=>2@25=��a8

A+GB67AhCK8$;34 i ID476�8+CK:<¥�=B:

(0, 1]f �y=B:38-4M�B?r47:>AD2�T ¢>ku=BI

1/√

p ≤ t ≤ 1¢

h(t) ≤ h(1/√

p) =1

1 + p+

2√

p

1 +√

p

f� G>CP8$H3ID=M�B478�CP:<4��>?<6M2@C@A�TFß��_à�6�:<; i =BLNH32K4�AD4M8zA+G34aH3ID=3=>k�=>k�ßK6�à f

Page 58: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

ßuJ�à � G>CP8�CK8�AEID4M6�AE4M;"8+CKL�CP2P6�I�2�T f0� G34�AEI�6�:38*Hr=B8+C@ADCK=B:(a, b, c, d) 7→ (b, a, d, c)CK:"A+G34�CP:<4��>?<6M2@C@A�T

a

a + b+

b

b + c+

c

c + d+

d

d + a≤ 1

1 + p+

3 3√

p

1 + 3√

p

ß � àTBCK472K;38zA+G34 4M�B?3C �>6M2K4M:>A�CP:<4��>?<6M2@C@A�T

b

b + a+

a

a + d+

d

d + c+

c

c + b≤ 1

1 + p+

3 3√

p

1 + 3√

p

f� CK: i 4

a

a + b+

b

b + c+

c

c + d+

d

d + a= 4 −

(

b

b + a+

a

a + d+

d

d + c+

c

c + b

) ¢� 4a894�4OA+GB6�A�ß � à�CK8�8*67ADCP8*�r4�;"C@ky6�:<;N=B:B2�T"CPk

a

a + b+

b

b + c+

c

c + d+

d

d + a≥ 4 −

(

p

p + 1+

3 3√

p

1 + 3√

p

)

=p

p + 1+

3

1 + 3√

p

f� G>?<8\¢>AD=�H3ID=M�B4 ß5J�àE¢BC�A�CK8�8+? � i CK4M:>A�AD=�H<ID=7�B4 ß � à f¡M4�A

x = b/a¢y = c/b

¢u = c/d

¢B6�:<;v = d/a

f�� G34M:Fß � à�J<4 i =BLF4M81

1 + x+

1

1 + y+

1

1 + u+

1

1 + v≤ 1

1 + p+

3 3√

p

1 + 3√

p

f ß � à� =�AD4XA+GB67A

xyuv = 16�:<;

x¢y¢u¢v ∈ [1/p, p]

f�� =�H<ID=7�B4�ß � à*¢�C@A�CK8z8*? � i C547:>A�AD=H<ID=7�B4 ß � à�ku=BIz672P2r8+? i Gx¢y¢u¢B6�:<;

vf¡M4�A

t =√

xy6�:<;

s =√

uvf �BTFA+G34"8�TBLFLF4�AEI�TFCK:�ß � à+¢3� 4�LF6\TQ6M898+?<L�4A+GB67A

t ≤ sf�� G34M:y¢r8*CP: i 4

ts = 1¢3� 4 8-4M4aA+GB6�A

t ≤ 1 ≤ sf � ?<IæA+G34MIDL�=BID4>¢ 8+CK: i 4

s2/u = v ≤ p¢�� 4aGB6��B4

s2/p ≤ u¢B6M:<;"A+G>?<8�¢

s2/p ≤ u ≤ pf� =���¢>ku=BI���ò�4�;

max

{

u + v∣

∣ uv = s2 ¢ s2

p≤ u ≤ p

}

= max

{

u +s2

u

s2

p≤ u ≤ p

}

= p +s2

p

f� G>?<8\¢

1

1 + u+

1

1 + v=

2 + u + v

1 + u + v + uv= 1 − s2 − 1

1 + u + v + s2

≤ 1 − s2 − 1

1 + p +s2

p+ s2

=2 + p +

s2

p

1 + p +s2

p+ s2

=p

s2 + p+

1

1 + p

f ßu�\à

Page 59: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� ���

Ú 8*CP:<¥OCK:<4M�B?<672PC�ADC5478$ßu�\à�6M:<;Fß � à+¢�� 4a¥74�A1

1 + x+

1

1 + y+

1

1 + u+

1

1 + v≤ 2s

1 + s+

p

s2 + p+

1

1 + p

f¡M4�A

g(s) =2s

1 + s+

p

s2 + p

f � CP: i 4g′(s) =

2(s − p)(s3 − p)

(s + 1)2(s2 + p)2¢�A+G>CK8

kK?<: i ADC5=B:ÉGB6M8"6Q25= i 6M2zLF6_ò�CPLN?<L 67As = 3

√p¢�� G>C i G�CP8 CK:�A+G34QCK:>AD4MI��>672

(1, p)f

�S4 GB6\�B4g(1) = −1 +

p

1 + p< 0

6�:<;g(p) = − 2

p + 1+

1

p + 1< 0 ` � G34M: i 4B¢

maxs∈[1,p]

g(s) = g(

3√

p) ¢B6M:<;"A+G347ID47ku=BID4>¢

1

1 + x+

1

1 + y+

1

1 + u+

1

1 + v≤ 2 3

√p

1 + 3√

p+

p3√

p2 + p+

1

1 + p

=3 3

√p

1 + 3√

p+

1

1 + p

f� G>CP8$H3ID=M�B478�ß � à�6M:<; i =BLNH32K4�AD4M8zA+G34aH3ID=3=>k�=>k�ß5J�à f

��� ���H�����U����Z �������DBIB�! [�O����CH<i57"�$E5'1��.Q�� S (��(#p���FZ(#&���SQ�FJ$9� (3(#�� �1LQ#)+q�$3�MQ���PU1RS &(]�&�1hP�� ��� �U8

,7 7I� [�f?9���J<E<K$ o S��� &g5'(#SU���1R��SUPU�.$KD�&XNeS 1R&B��&�$9����$E57"��98'&�('�ZP *'E]�12�.]K�����1��

�������u�Q 5������������� ���������?�m #"J$�&'$�(?)�*�+�-�t�;�(%0A7B)p���� "8=3$�; �J)�C:��HZ0Bv�)�"�(J0�=>-u$�n� �7B$�03)�(?=U0UCE:$�k�;�H�0U;�~6;�H<* }X;�+�"�03)D7'sp$�(J&#0UH6)D(?28G�C: �;�"�0@(iC:I�"�;�H<2J)��K�L?M

n ≥ 3� \�^�c,RUL?M

x1

�x2

�. . .

�xn N L�T [ VJSAM5S e�L�]5L�\�RX^�f�� N L�]�V�V%f#a%P�MJP�\?M

x1x2 · · · xn = 1� � [ ]

n = 3\�^�c

n = 4� T�] [ e�LuMJP�\?M

1

x21 + x1x2

+1

x22 + x2x3

+ · · · +1

x2n + xnx1

≥ n

2

{ $�7�G�=U03$�Hl+�-�=|4<)&6"%$�&'$�(�)?"D�&QV%S@^�_�MJP�L/V%f N VJM5S�M5f�M5S [ ^�V x1 =

a2

a1

�x2 =

a3

a2

�. . .

�xn =

a1

an

� MJP�L_�S�e�L�^�S@^�L � f�\�RASAM3� N L�a [ �,L�V

a1

a2 +√

a1a3

+a2

a3 +√

a2a4

+ · · · +an

a2 +√

ana2

≥ n

2

�d SU^�a`L √

a1a3 ≤ a1 + a3

2

�. . .

� √ana2 ≤ an + a2

2

� SAMOVJf�� a`L�VOM [ V8P [�Y MJP�\�Ma1

a1 + 2a2 + a3

+a2

a2 + 2a3 + a4

+ · · · +an

an + 2a1 + a2

≥ n

4

� �!MJP�L � \�f#a%P�� � d a%P Y \�] � � ^�L � f�\�R@S�MB� ��Y L�P�\�e�L

(a1 + · · · + an)2 ≤ [a1(a1 + 2a2 + a3) + · · · + an(an + 2a1 + a2)]

·(

a1

a1 + 2a2 + a3

+ · · · +an

an + 2a1 + a2

) �

Page 60: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

� G>?<8\¢BC�Az8+? � i 4M8zAE=�89G3=���A+GB6�A4(a1 + · · · + an)2 ≥ n[a1(a1 + 2a2 + a3) + · · · + an(an + 2a1 + a2)]

f� G>CP8�CP:<4��>?<6M2@C@A�T�CP8�6�:�C5;34M:>ADC�A�T"ku=BI

n = 4f � =BI

n = 3¢>C�A�CP8

a21 + a2

2 + a23 ≥ a1a2 + a2a3 + a3a1

¢� G>C i G"CK8zAEI�?r4B¢3J34 i 6M?<8942(a2

1 + a22 + a2

3 − a1a2 − a2a3 − a3a1)

= (a1 − a2)2 + (a2 − a3)

2 + (a3 − a1)2 ≥ 0

f� G>CP8 i =BLFHB254\AE478�A+G34�H<ID=3=>k f�� �B?<672PC�A�TNG3=>25;B8z� G347:

xi = 1ku=BIz672P2

if

I�*�X)&���n = 3

^E&��E&�� ���X���������\ ��JN%<����ENlNd 3���K��"�"#�+D���$9"BPU1R&��� 3�3Q�1+p.$�=�1R&�(�)�B�!I.*'�12^E&��M��(�MS (')���1�12�)2P'�.QB �FJS �2��SU��(K�

���������Q 5�����������������������?�m #"J$�&'$�(?)�*�+�-�t�;�(%0A7B)p���� "8=3$�; �J)�C:��HZ0Bv�)�"�(J0�=>-u$�n� �7B$�03)�(?=U0UCE:$�k�;�H�0U;��K�L?M

0 < m < 1� \�^�c/RUL?M

a�b�c ∈

[√m, 1/

√m]

��� ] [ e�LuMJP�\?Ma3 + b3 + c3 + 3(1 + m)abc

ab(a + b) + bc(b + c) + ca(c + a)≥ 1 +

m

2

{ $�7�G�=U03$�Hl+�- �?$�)87 { 254Z7B$�(?+�)?"�z�C:9<;�-�(J0B*�)DCE�!��CQ� { j �K�L?M

f(x) = −2x2 +(

m2 +3m)

x+(

m3 −3m2 −2m+2)

� � [ ]x ≥ m

�f ′(x) = −4x + m2 + 3m ≤ −4m + m2 + 3m = m(m − 1) < 0

�Y PZS>a%P!SU��T�RAS>L�VOMJP�\?M

f(x)S@VQc�L�aJ]5L�\�V%S@^�_ �d f�T�T [ V8L�MJP�\�M

a = m�b ∈ [m, 1]

� \�^�cc = 1

�'W P�L�^m = a ≤ b ≤ c = 1\�^�c

2[a3 + b3 + c3 + 3(1 + m)abc]

− (m + 2)[a2b + ab2 + b2c + bc2 + c2a + ca2]

= 2[m3 + b3 + 1 + 3(1 + m)mb]

− (m + 2)[m2b + mb2 + b2 + b + m + m2]

= 2b3 − (m2 + 3m + 2)b2 + (−m3 + 4m2 + 5m − 2)b

+(m3 − 3m2 − 2m + 2)

= (1 − b)[−2b2 + (m2 + 3m)b + (m3 − 3m2 − 2m + 2)]

= (1 − b)f(b) ≥ (1 − b)f(1) = (1 − b)m(m − 1)2 ≥ 0�

Y PZS>a%P���SUL�RUc�Va3 + b3 + c3 + 3(1 + m)abc

a2b + ab2 + b2c + bc2 + c2a + ca2≥ 1 +

m

2

Page 61: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� ���

� ?<H<H<=B8-4�A+GB6�Aa¢b¢c ∈ [

√m, 1/

√m]f �QC@A+G3=>?BA�25=B8*8a=>kz¥747:<4MI�672PC�A�T ¢y� 4i 6M:F6M898+?<L�4OA+GB6�A

a ≤ b ≤ cf�� G347:m ≤ a

c≤ b

c≤ 1

f� 47: i 4>¢Bku=BI

(m′, a′, b′, c′) =(

a

c,

a

c,

b

c, 1) ¢�� 4 GB6\�B4

m ≤ m′ = a′ ≤ b′ ≤ c′ = 1¢

6�:<;"A+G347ID47ku=BID4>¢a′3 + b′3 + c′3 + 3(1 + m′)a′b′c′

a′2b′ + a′b′2 + b′2c′ + b′c′2 + c′2a′ + c′a′2 ≥ 1 +m′

2

¢� G>C i G i 6M:FJ<4X�aIDC�A�AE47:N6�8

a′3 + b′3 + c′3 + 3(1 + m′)a′b′c′

a′2b′ + a′b′2 + b′2c′ + b′c′2 + c′2a′ + c′a′2 − 1

≥ m′(

1

2− 3a′b′c′

a′2b′ + a′b′2 + b′2c′ + b′c′2 + c′2a′ + c′a′2

) f�BT"A+G34 g � 4�� � :<4��>?<6M2@C@A�Ty¢

a2b + ab2 + b2c + bc2 + c2a + ca2

6≥ 6

√a6b6c6 = abc

f� 47: i 4>¢

1

2− 3abc

a2b + ab2 + b2c + bc2 + c2a + ca2≥ 0

f� CK: i 4

a : b : c = a′ : b′ : c′ ¢�� 4aGB6\�B4a3 + b3 + c3 + 3abc

a2b + ab2 + b2c + bc2 + c2a + ca2− 1

=a′3 + b′3 + c′3 + 3a′b′c′

a′2b′ + a′b′2 + b′2c′ + b′c′2 + c′2a′ + c′a′2 − 1

≥ m′(

1

2− 3a′b′c′

a′2b′ + a′b′2 + b′2c′ + b′c′2 + c′2a′ + c′a′2

)

= m′(

1

2− 3abc

a2b + ab2 + b2c + bc2 + c2a + ca2

)

≥ m

(

1

2− 3abc

a2b + ab2 + b2c + bc2 + c2a + ca2

) ¢6�:<;"A+G347ID47ku=BID4>¢

a3 + b3 + c3 + 3(1 + m)abc

a2b + ab2 + b2c + bc2 + c2a + ca2≥ 1 +

m

2

f��� ��� ���������f ������!�R,a��59��IB�U"�$MNeS �2���3Q�1RSE"#�3QBPU*��1�(l"BP &BP+�5'(#SU���1R��SUPU�.$��.�.][� S (#$iN%<9$J5K"L��8�M�ED#I��H 3�u���ECH<@5K".$H571��.Q.� S ('�(Bp���FZ(3&���S+Q�FJ$M�U(#(3�� �1LQB)Rq�$���Q���P 1RS &�8�&�(��TPU*�H]�12�.]K�����1��lI�*��12\^E&��

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Page 62: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

á Ø ë © f 7 4MHB2K6 i 47L�47:>A f �D�M�����Üì � � � ¢ � ��� � ª ä � � � é�ã � � � � i¯_ç�� ° Mä-êKç5è ã �� J±�ç5ä+ã � � é7ê � �<ã�èyê��®0è>ç$¯Mã\ä�é+ç�� �c´�>âæç � è�7å � �3ê � è � ±� �<ã ° ã� �ç�â � � ° ã� �ç�â �rf

¡M4�AP (z)

J<4�6M:�T�:<=B:<� i =B:38+A�6�:>A i =BLNH32K4*òNL�=B:BC i Hr=>2 T3:<=BL�CK672 f � G3=�� A+GB6�AA+G34MID4�CP8�6 i =BLFHB254+ò :B?<L�J34MIw8*? i G�A+GB67A |w| ≤ 1

6�:<; |P (w)| ≥ 1f

s f � � å �BêKç � è � � ° ç�â �yã-å�¬ 3ê 7ç@åPå�ã � � � �>ã�è ����ä MèyâEã f¡M4�A

P (z) = zn +an−1zn−1 + · · ·+a1z+a0f � ?<H3Hr=B894B¢7AD=RA+G34 i =B:>AEI�6MI�Ty¢A+GB67A |P (z)| < 1

ku=BIa6M2@2 i =BLNH32K4*ò�:B?<LFJ<47I�8z8+? i G�A+GB67A |z| ≤ 1

f ��=B:38+C5;34MIQ(z) = a0zn + a1zn−1 + · · · + an−1z + 1

f�� =�AE4OA+GB6�AQ(z) = znP

(

1

z

) ku=BIz 6= 0

f�� G>?<8\¢>CPk |z| = 1¢�A+G34M: |Q(z)| =

∣P(

1

z

)∣

∣< 1

f� A�ku=>2P2K=��a8zA+GB6�A 2π

0

|Q(eit)| dt < 2πf�� =�� 4-�B47I-¢

∫ 2π

0

Q(eit) dt =

∫ 2π

0

(

a0eint + a1ei(n−1)t + · · · + an−1eit + 1)

dt = 2π¢

8*CP: i 4 2π∫

0

eikt dt =1

ik

(

e2kπi − 1)

= 0ku=BI�672P2

k = 1¢2¢. . .¢nf

� 47: i 4>¢2π =

2π∫

0

Q(eit) dt

≤2π∫

0

|Q(eit)| dt < 2π¢36 i =B:>AEI�6�;BC i ADC5=B: f

sæs f � � å �BêKç � è � � ¬<çKè � � � � é7ê � �<ã�èyê� � ��è�� � Mè � �� � � � è ��®�èBç(¯Mã�äæé*ç�ê� ���²MãMâ �<è � å � ����Mè � � âæç�ã\èyâEã ��� � � Mè�� � � �3ã_ç ��� �BçKè ��± � ��ç��yã�� � ��ê�yã ã ��çæê � ä f

¡M4�AP (z) = zn + an−1zn−1 + · · · + a1z + a0

f ¡M4�Aζ = eiπ/n

f�� G34M:ζn = −1

¢ζ2n = 1

¢B6M:<; |ζk| = 1ku=BI

k = 0¢1¢2¢. . .¢2n − 1

f�� =���¢2n−1∑

k=0

∣P (ζk)∣

∣ ≥∣

(

P (1) + P (ζ2) + · · · + P (ζ2n−2))

−(

P (ζ) + P (ζ3) + · · · + P (ζ2n−1))∣

=

n−1∑

k=0

(

P (ζ2k) − P (ζ2k+1))

ß � à6�:<;

n−1∑

k=0

(

P (ζ2k) − P (ζ2k+1))

=

n−1∑

k=0

(

(ζ2k)n − (ζ2k+1)n)

+

n−1∑

j=1

aj

n−1∑

k=0

(

(ζ2k)j − (ζ2k+1)j) f ß��_à

� =�AD4 A+GB67A(ζ2k)n − (ζ2k+1)n = (ζn)2k − (ζn)2k+1 = 1 − (−1) = 2

¢6�:<;FG347: i 4>¢n−1∑

k=0

(

(ζ2k)n − (ζ2k+1)n)

= 2nf ß � à

Page 63: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

� � �

£ :�A+G34a=�A+G34MIzGB6�:<; ¢Bku=BIz4M6 i Gj = 1

¢2¢. . .¢n − 1

¢�� 4aGB6\�B4n−1∑

k=0

(

(ζ2k)j − (ζ2k+1)j)

= (1 − ζj)

n−1∑

k=0

(ζ2j)k

= (1 − ζj)1 − (ζ2j)n

1 − ζ2j= 0

¢ ß � à8*CP: i 4

(ζ2j)n = (ζ2n)j = 1f

� ?rJ38EADC@AD?BADCP:<¥aß � à�6M:<;Fß � à�CK:>AD=Nß��_à�6�:<;"?<8*CP:<¥aß � à+¢�� 4OA+G347:�GB6\�B42n−1∑

k=0

∣P (ζk)∣

∣ ≥ 2n¢

k5ID=BL � G>C i Ga� 4a;34�;>? i 4OA+GB67A�A+G347ID4�LN?<8EA�J34�8-=BLF4k¢M��C@A+G

0 ≤ k ≤ 2n − 1¢>ku=BI� G>C i G |P (ζk)| ≥ 1

¢ i =BLNH32K4�ADCP:<¥OA+G34�H<ID=3=>k f��� ���i���������J ��HA� 3 ?�������KD��i5�$K�!��(#pXAK��(#p.$9�#*#S (3&�8'&�('�JP *'�]�12�.]K�����1��EI.*'�12M^E&��>&�� ���J��(�

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w)&�(T 3X)R*������(G���jPU*#&#P |w| = 1

&�(�� |P (w)| ≥ 1� o QBP�P *#S ��S �M(��#P

�.Q�1+]�1RS ��S (Bp�$[S (j��SU�^a� �9P *'@^@L� �A�+qB(��B^E(jNf&���S FgQ�F Nd�#�[Q��Q��M,[1RS (')S ][�UB�

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/ j Hm�Z0B=|-�C { 4�;�H�o0@C��4�0UH�;��K�L?M

a�b�c N L/MJP�L/MJP�]5L�L�VJS>c�L�V [Zg \�M`]�SU\�^�_�R>L � \�^�clR>L�M ha

�hb

�hc N L�MJP�L\�R�M5SAM5f#c�L�VOM [ MJP�L�VJS>c�L�V

a�b�c� ]5L�V%T#L�a5M5S�e�L?R�� ��� ] [ e�L�MJP�\�M

h2a

b2 + c2· h2

b

c2 + a2· h2

c

a2 + b2≤(

3

8

)3 �

� (%(?)�HX=U0U;�7A7|- =|4<)�(8;�k )�(?$�7�G�=U03$�H +�- sbrbq<0�&�& �?$�4�H�(?$�H�C�9�)�;�v�)�"8=B$�H�C ��EXC � { j ~�?$�)D7 { 254�73$�(�+�)�"�z�Cy9<;�-�(%03*�)�C �!��C1� { j ~!;�H<* sbr ��r { k )�)�H�w�C��;?7�=�+�$�k�k )87UCy=|4<)��)�=|4<)?"�7U;�H<*�(��&QV%S@^�_�MJP�L g|[ ]5��f�R@\

ha = b sin C� MJP�LyK�\ Y [Zg�d SU^�L�V � \�^�c�MJP�L � ��� �� ^�L � f�\�RASAM3� ��Y L [ N M5\�SU^

h2a

b2 + c2=

b2 sin2 C

b2 + c2=

sin2 B sin2 C

sin2 B + sin2 C

≤ sin2 B sin2 C

2 sin B sin C=

1

2sin B sin C

�\�^�c�VJSU�/S@R@\�]�R�� �

h2b

c2 + a2≤ 1

2sin C sin A

\�^�c h2c

a2 + b2≤ 1

2sin A sin B

Page 64: WholeIssue 33 4 - cms.math.ca · 4m: i =blflf4m: 6:>a h36i 1 Ý 6x2k6xi 6 cp:c ae4 Ý 6aaei 6\ b4mi

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sin A sin B sin C ≤ 3√

3

8ß5894�4 � � ¢BH f � � � à+¢�� 4a=3J>A�6MCP:h2

a

b2 + c2· h2

b

c2 + a2· h2

c

a2 + b2≤ 1

8(sin A sin B sin C)2

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8

(

3√

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