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Barnes zeta function

In mathematics, a Barnes zeta function is a generalization of the Riemann zeta function introduced by E. W. Barnes (1901). It is further generalized by the Shintani zeta function.

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Definition

The Barnes zeta function is defined by

ζ N ( s , w ∣ a 1 , … , a N ) = ∑ n 1 , … , n N ≥ 0 1 ( w + n 1 a 1 + ⋯ + n N a N ) s {\displaystyle \zeta _{N}(s,w\mid a_{1},\ldots ,a_{N})=\sum _{n_{1},\dots ,n_{N}\geq 0}{\frac {1}{(w+n_{1}a_{1}+\cdots +n_{N}a_{N})^{s}}}}

where w and aj have positive real part and s has real part greater than N.

It has a meromorphic continuation to all complex s, whose only singularities are simple poles at s = 1, 2, ..., N. For N = w = a1 = 1 it is the Riemann zeta function.