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arXiv · 2108.07677

Generalizations of Lerch's formula by Barnes' multiple zeta functions

Su Hu·Min-Soo Kim
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Abstract

The classical Lerch's formula states the following normalized product: $$\prod_{n=0}^\infty(x+n)=\frac{\sqrt{2\pi}}{\Gamma(x)},\quad \textrm{Re}(x)>0, $$ where $\Gamma(x)$ is the Euler gamma function. In this note, by using Barnes' multiple zeta function and its alternating form, we obtain two kinds of generalizations of Lerch's formula, which imply the product $$ \prod_{n=1}^\infty n=\sqrt{2\pi} $$ (in the sense of zeta regularization) and the product $$\frac{2\cdot2}{1\cdot 3}\frac{4\cdot4}{3\cdot 5}\frac{6\cdot6}{5\cdot 7}\cdots=\frac{\pi}{2}$$ (Wallis' formula in 1656), respectively.

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Su Hu, Min-Soo Kim. 2021-08-17. Generalizations of Lerch's formula by Barnes' multiple zeta functions. https://arxiv.org/abs/2108.07677

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