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Asymptotic expansions of multiple zeta functions and power mean values of Hurwitz zeta functions

机译:多个zeta函数的渐近展开式和Hurwitz zeta函数的幂平均值

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Let ζ(s,α) be the Hurwitz zeta function with parameter α. Power mean values of the form Σ_(q=q)~q ζ(s,a/q)~h or Σ_(a=1)~q|ζ(s,a/q)|~(2h) are studied, where q and h are positive integers. These mean values can be written as linear combinations of Σ_(a=1)~q ζ_r(s_1...,s_r;a/q), where ζ_r(s_1,...,s_r;α) is a generalization of Euler-Zagier multiple zeta sums. The Mellin-Barnes integral formula is used to prove an asymptotic expansion of Σ_(a=1)~q ζ_r(s_1,...,s_r;a/q) with respect to q. Hence a general way of deducing asymptotic expansion for mulas for Σ_(a=1)~q|ζ(s,a/q)~h and Σ_(a=1)~q|ζ(s,a/q)|~(2h) is obtained. In particular, the asymptotic expansion of Σ_(a=1)~q ζ(1/2,a/q)~3 with respect to q is written down.
机译:设ζ(s,α)为参数为α的Hurwitz zeta函数。研究了Σ_(q = q)〜qζ(s,a / q)〜h或Σ_(a = 1)〜q |ζ(s,a / q)|〜(2h)形式的幂平均值,其中q和h是正整数。这些平均值可以写成Σ_(a = 1)〜qζ_r(s_1 ...,s_r; a / q)的线性组合,其中ζ_r(s_1,...,s_r;α)是Euler的推广-Zagier多个zeta和。 Mellin-Barnes积分公式用于证明∑_(a = 1)〜qζ_r(s_1,...,s_r; a / q)关于q的渐近展开。因此,推导∑_(a = 1)〜q |ζ(s,a / q)〜h和Σ_(a = 1)〜q |ζ(s,a / q)|〜的mu的渐近展开的一般方法获得(2h)。特别地,记下相对于q的∑_(a = 1)〜qζ(1/2,a / q)〜3的渐近展开。

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