English

The construction of $q$-analogues via $_3\phi_2$-series and $q$-difference equations

Combinatorics 2026-02-17 v1

Abstract

We apply the EKHAD-normalization method given in our recent work to obtain, via the qq-version of Zeilberger's algorithm, qq-WZ pairs (F,G)(F, G) such that k=0F(0,k)\sum_{k = 0}^{\infty} F(0, k) may be expressed as a basic hypergeometric series of the form 3ϕ2{}_{3}\phi_2 with multiple free parameters, and in such a way so that k=0F(0,k)=n=0G(n,0)\sum_{k=0}^{\infty} F(0, k) = \sum_{n=0}^{\infty} G(n, 0). In contrast to how previous applications of EKHAD-normalization relied on qq-analogues for specific WZ pairs introduced by Guillera, our multiparameter approach provides a broad framework in the construction of qq-analogues for accelerated series for universal constants such as π\pi. We apply this multiparameter version of EKHAD-normalization to obtain and prove new qq-analogues for accelerated hypergeometric series attributed to many authors, including (alphabetically) Adamchik and Wagon, Ap\'{e}ry, Chu, Chu and Zhang, Fabry, Guillera, Ramanujan, and Zeilberger.

Keywords

Cite

@article{arxiv.2602.14314,
  title  = {The construction of $q$-analogues via $_3\phi_2$-series and $q$-difference equations},
  author = {John M. Campbell},
  journal= {arXiv preprint arXiv:2602.14314},
  year   = {2026}
}

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