On Schultz's generalization of Borweins' cubic identity
Number Theory
2026-04-20 v2 Classical Analysis and ODEs
Combinatorics
Abstract
In 1991, the Borweins established a cubic analogue of Jacobi's identity for theta functions, which is used by B.C. Berndt, S. Bhargava, and F.G. Garvan in the development of Ramanujan's cubic theory of elliptic functions. In 2013, D. Schultz discovered an identity for theta series in three variables which generalizes the Borweins' identity. In this article, we revisit Schultz's identity and present two distinct approaches to its derivation. Our investigation not only provides new proofs but also yields several new Schultz-type identities.
Cite
@article{arxiv.2511.15519,
title = {On Schultz's generalization of Borweins' cubic identity},
author = {Heng Huat Chan and Song Heng Chan and Zhi-Guo Liu and Wadim Zudilin},
journal= {arXiv preprint arXiv:2511.15519},
year = {2026}
}
Comments
23 pages