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On -analogues of the Euler constant and Lerch's limit formula
Authors:Nobushige Kurokawa  Masato Wakayama
Institution:Department of Mathematics, Tokyo Institute of Technology, Meguro, Tokyo, 152-0033 Japan ; Faculty of Mathematics, Kyushu University, Hakozaki, Fukuoka, 812-8581 Japan
Abstract:We introduce and study a $q$-analogue $\gamma (q)$ of the Euler constant via a suitably defined $q$-analogue of the Riemann zeta function. We show, in particular, that the value $\gamma (2)$ is irrational. We also present a $q$-analogue of the Hurwitz zeta function and establish an analogue of the limit formula of Lerch in 1894 for the gamma function. This limit formula can be regarded as a natural generalization of the formula of $\gamma (q)$.

Keywords:Euler's constant  Riemann's zeta function  Hurwitz's zeta function  $q$-gamma function  Lerch's limit formula
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