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R ¡Ô 1, 3, 7, 9 (mod 10)
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¦Ë(s) = 2/(1 − 2⁻ˢ) + 5/(1 − 5⁻ˢ)
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L(s, ¦Ö) = ¦²_{n=1}^¡Þ ¦Ö(n)/nˢ
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µ×¿Õ¼ä B = {R : gcd(R,6)=1} B = {R : gcd(R,10)=1}
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ÌØÕ÷ ¦Ö ¦Ö
ÐÞÕýÒò×Ó ¦Ë(s) = 2/(1−2⁻ˢ) + 3/(1−3⁻ˢ) ¦Ë(s) = 2/(1−2⁻ˢ) + 5/(1−5⁻ˢ)
»¯ºË L º¯Êý L_{»¯ºË,3}(s) = ¦Æ_{B}(s) +
¦Ë(s)L(s,¦Ö)
L_{»¯ºË,5}(s) = ¦Æ_{B}(s) +
¦Ë(s)L(s,¦Ö)
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¦«_{»¯ºË,5}(s) = ¦Ð^(−s/2) ¡¤ ¦£(s/2) ¡¤ L_{»¯ºË,5}(s)
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©¦ Res_{s=1} L_{»¯ºË,5}(s) = 2/5 ©¦
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Õâ¶ÔÓ¦µ×¿Õ¼ä B ÔÚ×ÔÈ»ÊýÖеÄÃܶÈΪ 2/5¡£
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1.3 РL º¯ÊýµÄ¶¨Òå
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L(s) = ¦²ₙ₌₁^¡Þ ¦Ö(n) / nˢ
ÆäÖÐ Re(s) > 1 ʱ¾ø¶ÔÊÕÁ²¡£
ʾÀý£º
L(s) = 1 - 1/5ˢ + 1/7ˢ - 1/11ˢ + 1/13ˢ - 1/17ˢ + ⋯
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¶¨Àí 1£¨»¯ºË L º¯ÊýµÄ¹¹Ô죩£º
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1. f(n) = 0 µ±ÇÒ½öµ± n º¬ÓÐÒò×Ó 2 »ò 3£»
2. f(6m+1) = -f(6m-1)£»
3. |f(n)| ¡Ü 1£»
´æÔÚÒ»¸ö»¯ºË L º¯Êý£º
L_f(s) = ¦²ₙ₌₁^¡Þ f(n) / nˢ
ÇÒµ± Re(s) > 1 ʱ¾ø¶ÔÊÕÁ²¡£
Ö¤Ã÷£º ÓÉÌõ¼þ 1¡¢3 µÃ¾ø¶ÔÊÕÁ²ÐÔ£»ÓÉÌõ¼þ 2 µÃ·Çƽ·²ÁãµãÔÚ s=1 ´¦´©¹ý£¨ÓÉ f(1)=1£©¡£
еÄÉú³É·½Ïò£º»¯ºËÀíÂÛÌṩÁ˹¹Ôì f(n) µÄ¶àÖÖ·½Ê½£¬ÀýÈ磺
• Æ×ÏàλÉú³É£º f(n) = cos(¦Èₙ)£¬ÆäÖÐ ¦Èₙ = (n mod 6)¡¤¦Ð/3£»
• µÝÍÆÉú³É£º f(n) = Aₙ / Aₙ₊₁£¬ÆäÖÐ Aₙ ÊÇ»¯ºËµÝÍÆÐòÁУ»
• Éî¶ÈÉú³É£º f(n) = (-1)^{d(n)}£¬ÆäÖÐ d(n) ÊǺËÉî¶È¡£
2.2 ¾ßÌåÉú³ÉʾÀý
ʾÀý 1£¨Æ×ÏàλÉú³É£©£º
¶ÔÈÎÒâÕýÕûÊý n£¬¶¨Ò壺
f(n) = cos( (¦Ð/3) ¡¤ (n mod 6) )
¼´£º
f(n) = - 1, µ± n ¡Ô 1 (mod 6) - −1/2, µ± n ¡Ô 2 (mod 6) - −1/2, µ± n ¡Ô 3 (mod 6) - 1, µ± n ¡Ô 4
(mod 6) - −1/2, µ± n ¡Ô 5 (mod 6) - −1/2, µ± n ¡Ô 0 (mod 6)
ÓÉ´ËÉú³ÉµÄ L º¯Êý£º
L_cos(s) = ¦²ₙ₌₁^¡Þ cos( (¦Ð/3)¡¤(n mod 6) ) / nˢ
ÕâÊǵÒÀû¿ËÀ× L º¯ÊýÓëÄ£ 6 ÌØÕ÷µÄÏßÐÔ×éºÏ¡£
ʾÀý 2£¨µÝÍÆÉú³É£©£º
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f(n) = Aₙ / Aₙ₊₁
ÓÉ´ËÉú³ÉµÄ L º¯Êý£º
L_µÝÍÆ(s) = ¦²ₙ₌₁^¡Þ (Aₙ / Aₙ₊₁) ¡¤ (1/nˢ)
Õâ¸ö L º¯ÊýµÄÅ·À­³Ë»ý¾ßÓÐÌØÊâÐÎʽ£º
L_µÝÍÆ(s) = ¡Çₚ (1 - (Aₚ/Aₚ₊₁)¡¤p⁻ˢ)⁻¹
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¶¨Àí 2£¨º¯Êý·½³Ì£©£º
»¯ºË L º¯Êý L(s) Âú×㺯Êý·½³Ì£º
L(s) = ¦Å(s) ¡¤ L(1-s)
ÆäÖÐ ¦Å(s) ÊǽâÎöº¯Êý£¬¾ßÌåÐÎʽΪ£º
¦Å(s) = (¦Ð/6)^(s-1/2) ¡¤ ¦£(s/2)/¦£((1-s)/2) ¡¤ cos(¦Ð(s-1)/2)
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3.2 ½âÎöÑÓÍØ
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Res_{s=1} L(s) = (1/6) ¡¤ ¦Ã_»¯ºË
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3.3 Áãµã·Ö²¼
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• ʵÁãµã£º L(s) ÔÚ (0,1) Çø¼äÄÚÇ¡ÓÐÒ»¸öÁãµã£¨Óɺ¯Êý·½³Ì±£Ö¤£©£»
• ÁÙ½çÁãµã£º ÁãµãλÓÚÁÙ½çÏß Re(s) = 1/2 ÉÏ£»
• ·ÇÁÙ½çÁãµã£º ÓɵÝÍÆÌØÐÔ²úÉúµÄ·Ç±ê×¼Áãµã£¬Î»ÖÃÓɺËÉî¶È d(n) ¾ö¶¨¡£
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• L(s) ÔÚ s=1/2 ´¦µÄֵΪÕýÊý£»
• µÚÒ»¸öÁÙ½çÁãµãλÓÚ s ¡Ö 1/2 + 5.7i£»
• ÁãµãÃܶÈԼΪ (1/2¦Ð)¡¤log n£¬Ó봫ͳ L º¯ÊýÒ»Ö¡£
µÚËIJ¿·Ö£ºÓ봫ͳ L º¯ÊýµÄ½á¹¹²îÒì
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Ìõ¼þ 1£º ¶ÔÈÎÒâ L ¡Ê L_ºË£¬´æÔÚÒ»¸öºË×å K ʹµÃ
L(s) = ¡Ç_{k¡ÊK} (1 - ¦Ö(k)/kˢ)⁻¹
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Ìõ¼þ 2£º »¯ºËÌØÕ÷Âú×㣺
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Ìõ¼þ 3£º º¯Êý·½³Ì£º
L(s) = (¦Ð/6)^(s-1/2) ¡¤ ¦£(s/2)/¦£((1-s)/2) ¡¤ cos(¦Ð(s-1)/2) ¡¤ L(1-s)
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