On approximation of analytic functions by periodic Hurwitz zeta-functions

Abstract

The periodic Hurwitz zeta-function ζ(s, α; a), s = σ +it, with parameter 0 1, by series sum from m=0 to ∞ am / (m+α)s, and can be continued moromorphically to the whole complex plane. It is known that the function ζ(s, α; a) with transcendental or rational α is universal, i.e., its shifts ζ(s + iτ, α; a) approximate all analytic functions defined in the strip D = { s ∈ C : 1/2 < σ < 1. In the paper, it is proved that, for all 0 < α ≤ 1 and a, there exists a non-empty closed set Fα,a of analytic functions on D such that every function f ∈ Fα,a can be approximated by shifts ζ(s + iτ, α; a). First Published Online: 21 Nov 2018

Keywords

• Hurwitz zeta-function
• periodic Hurwitz zeta-function
• universality
• weak con- vergence of probability measures