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arXiv 1801.07565math.NT
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Ramanujan型互反双曲级数

Reciprocal Hyperbolic Series of Ramanujan Type

Ce Xu, Jianqiang Zhao

AI总结:

本文提出基于围道积分表示与Eisenstein级数留数计算的方法,对Ramanujan研究的几族双曲函数无穷级数求和,将其表示为超几何函数及其导数,并在特定参数为π时给出Gamma函数特殊值的封闭形式。

摘要:

本文提出了一种对几族涉及双曲函数的无穷级数求和的方法,其中一些级数最初由Ramanujan研究。核心思想基于它们的围道积分表示,并在Ramanujan、Berndt等人给出的Eisenstein级数的著名结果的辅助下进行留数计算。作为主要结果,几个涉及双曲函数的级数被求值并用$z={}_2F_1(1/2,1/2;1;x)$和$z'=dz/dx$表示。当这些级数中的特定参数等于$π$时,级数以Gamma函数的某些特殊值用封闭形式表示。此外,还给出了许多新的说明性例子。

英文摘要:

This paper presents an approach to summing a few families of infinite series involving hyperbolic functions, some of which were first studied by Ramanujan. The key idea is based on their contour integral representations and residue computations with the help of some well-known results of Eisenstein series given by Ramanujan, Berndt et al. As our main results, several series involving hyperbolic functions are evaluated and expressed in terms of $z={}_2F_1(1/2,1/2;1;x)$ and $z'=dz/dx$. When a certain parameter in these series is equal to $π$ the series are expressed in closed forms in terms of some special values of the Gamma function. Moreover, many new illustrative examples are presented.

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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