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Linnik's theorem : ウィキペディア英語版
Linnik's theorem
Linnik's theorem in analytic number theory answers a natural question after Dirichlet's theorem on arithmetic progressions. It asserts that there exist positive ''c'' and ''L'' such that, if we denote ''p''(''a'',''d'') the least prime in the arithmetic progression
:a + nd,\
where ''n'' runs through the positive integers and ''a'' and ''d'' are any given positive coprime integers with 1 ≤ ''a'' ≤ ''d'' - 1, then:
: p(a,d) < c d^. \;
The theorem is named after Yuri Vladimirovich Linnik, who proved it in 1944. Although Linnik's proof showed ''c'' and ''L'' to be effectively computable, he provided no numerical values for them.
== Properties ==

It is known that ''L'' ≤ 2 for almost all integers ''d''.
On the generalized Riemann hypothesis it can be shown that
: p(a,d) \leq (1+o(1))\varphi(d)^2 \ln^2 d \; ,
where \varphi is the totient function.〔
It is also conjectured that:
: p(a,d) < d^2. \;

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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