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arXiv 1409.1840math.NT
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character和的计算

Averages of character sums

Jonathan Bober

摘要:

我们表明,一个简短的截断的傅立叶展开的字符和给出了一个很好的近似的平均值,字符和一个区间。我们给出了这个结果的几个应用。一个是对于任何$b$,有无穷多个字符,对于所有与$b$互质的$a$,其到$\approx aq/b$的和都是$\gg q^{1/2} \log \log q$;另一个是如果模$q \equiv 3 \pmod 4$的最小二次非剩余很大,则字符和与$(\sqrt{q}/π) (L(1, χ) + \log 2 - ε)$一样大,并且如果$B$是这个非剩余,则存在长度为$(\sqrt{q}/π) (\log 2 - ε)$的$q/B$的和。

英文摘要:

We show that a short truncation of the Fourier expansion for a character sum gives a good approximation for the average value of that character sum over an interval. We give a few applications of this result. One is that for any $b$ there are infinitely many characters for which the sum up to $\approx aq/b$ is $\gg q^{1/2} \log \log q$ for all $a$ relatively prime to $b$; another is that if the least quadratic nonresidue modulo $q \equiv 3 \pmod 4$ is large, then the character sum gets as large as $(\sqrt{q}/π) (L(1, χ) + \log 2 - ε)$, and if $B$ is this nonresidue, then there is a sum of length $q/B$ which has size $(\sqrt{q}/π) (\log 2 - ε)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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