The Partial Theta Operator and Multivariate Generalized Lambert Series

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1. Verfasser: López, Ronald Orozco
Format: Preprint
Veröffentlicht: 2025
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author López, Ronald Orozco
author_facet López, Ronald Orozco
contents In this paper, we introduce the Theta Partial operator $θ(y\mathbf{D}_λ)$, based on the $λ$-derivative operator $\mathbf{D}_λ$, and use it to define the following generalization of the Lambert series \begin{equation*} \sum_{n=0}^{\infty}a_{n}\frac{x^{n+1}}{x-λ^ny}z^n. \end{equation*} Also, we define generalized Lambert-Mehler and Lambert-Rogers type series, double-sum bivariate generalized Lambert series and multivariate generalized Lambert series. A list of interesting generalized Lambert series is provided by using elementary functions.
format Preprint
id arxiv_https___arxiv_org_abs_2507_15160
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle The Partial Theta Operator and Multivariate Generalized Lambert Series
López, Ronald Orozco
Number Theory
33E20, 05A15, 11B39, 11B65
In this paper, we introduce the Theta Partial operator $θ(y\mathbf{D}_λ)$, based on the $λ$-derivative operator $\mathbf{D}_λ$, and use it to define the following generalization of the Lambert series \begin{equation*} \sum_{n=0}^{\infty}a_{n}\frac{x^{n+1}}{x-λ^ny}z^n. \end{equation*} Also, we define generalized Lambert-Mehler and Lambert-Rogers type series, double-sum bivariate generalized Lambert series and multivariate generalized Lambert series. A list of interesting generalized Lambert series is provided by using elementary functions.
title The Partial Theta Operator and Multivariate Generalized Lambert Series
topic Number Theory
33E20, 05A15, 11B39, 11B65
url https://arxiv.org/abs/2507.15160