English

$q$-Analogues of some series for powers of $\pi$

Combinatorics 2020-06-18 v2 Number Theory

Abstract

We obtain qq-analogues of several series for powers of π\pi. For example, the identity k=0(1)k(2k+1)3=π332\sum_{k=0}^\infty\frac{(-1)^k}{(2k+1)^3}=\frac{\pi^3}{32} has the following qq-analogue: \begin{equation*} \sum_{k=0}^\infty(-1)^k\frac{q^{2k}(1+q^{2k+1})}{(1-q^{2k+1})^3}=\frac{(q^2;q^4)_{\infty}^2(q^4;q^4)_{\infty}^6} {(q;q^2)_{\infty}^4}, \end{equation*} where qq is any complex number with q<1|q|<1. We also give qq-analogues of four new series for powers of π\pi found by the second author.

Keywords

Cite

@article{arxiv.1808.04717,
  title  = {$q$-Analogues of some series for powers of $\pi$},
  author = {Qing-Hu Hou and Zhi-Wei Sun},
  journal= {arXiv preprint arXiv:1808.04717},
  year   = {2020}
}

Comments

10 pages. Add Theorem 1.2