English

Hyperbolic summations derived using the Jacobi functions $\text{dc}$ and $\text{nc}$

Number Theory 2023-01-11 v1 Classical Analysis and ODEs

Abstract

We introduce a method that is based on Fourier series expansions related to Jacobi elliptic functions and that we apply to determine new identities for evaluating hyperbolic infinite sums in terms of the complete elliptic integrals KK and EE. We apply our method to determine generalizations of a family of sech\text{sech}-sums given by Ramanujan and generalizations of a family of csch\text{csch}-sums given by Zucker. Our method has the advantage of producing evaluations for hyperbolic sums with sign functions that have not previously appeared in the literature on hyperbolic sums. We apply our method using the Jacobian elliptic functions dc\text{dc} and nc\text{nc}, together with the elliptic alpha function, to obtain new closed forms for qq-digamma expressions, and new closed forms for series related to discoveries due to Ramanujan, Berndt, and others.

Keywords

Cite

@article{arxiv.2301.03738,
  title  = {Hyperbolic summations derived using the Jacobi functions $\text{dc}$ and $\text{nc}$},
  author = {John M. Campbell},
  journal= {arXiv preprint arXiv:2301.03738},
  year   = {2023}
}

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Submitted for publication

R2 v1 2026-06-28T08:08:10.261Z