On multiple series of Eisenstein type

TL;DR

This paper investigates multiple analogues of Eisenstein series, establishing explicit relations among them and providing new proofs and formulas using partial fraction techniques, extending prior work on hyperbolic function series.

Contribution

It introduces explicit relation formulas for multiple Eisenstein series and applies partial fraction methods to derive new identities, advancing the understanding of their structure.

Findings

Derived explicit relation formulas among multiple Eisenstein series.

Provided alternative proofs using partial fraction decompositions.

Presented new examples of explicit formulas for these series.

Abstract

The aim of this paper is to study certain multiple series which can be regarded as multiple analogues of Eisenstein series. As a prior research, the second-named author considered double analogues of Eisenstein series and expressed them as polynomials in terms of ordinary Eisenstein series. This fact was derived from the analytic observation of infinite series involving hyperbolic functions which were based on the study of Cauchy, and also Ramanujan. In this paper, we prove an explicit relation formula among these series. This gives an alternative proof of this fact by using the technique of partial fraction decompositions of multiple series which was introduced by Gangl, Kaneko and Zagier. By the same method, we further show a certain multiple analogue of this fact and give some examples of explicit formulas. Finally we give several remarks about the relation between our present result and the previous work for infinite series involving hyperbolic functions.