Journal
RAMANUJAN JOURNAL
Volume 16, Issue 3, Pages 247-270Publisher
SPRINGER
DOI: 10.1007/s11139-007-9102-0
Keywords
Lerch transcendent; zeta function; infinite product; double integral; polylogarithm
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The two-fold aim of the paper is to unify and generalize on the one hand the double integrals of Beukers for zeta(2) and zeta(3), and of the second author for Euler's constant gamma and its alternating analog ln(4/pi), and on the other hand the infinite products of the first author for e, of the second author for pi, and of Ser for e(gamma). We obtain new double integral and infinite product representations of many classical constants, as well as a generalization to Lerch's transcendent of Hadjicostas's double integral formula for the Riemann zeta function, and logarithmic series for the digamma and Euler beta functions. The main tools are analytic continuations of Lerch's function, including Hasse's series. We also use Ramanujan's polylogarithm formula for the sum of a particular series involving harmonic numbers, and his relations between certain dilogarithm values.
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