Title Joint discrete approximation of analytic functions by shifts of the Riemann zeta-function twisted by Gram points /
Authors Laurinčikas, Antanas
DOI 10.3390/math11030565
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Is Part of Mathematics.. Basel : MDPI. 2023, vol. 11, iss. 3, art. no. 565, p. [1-15].. eISSN 2227-7390
Keywords [eng] Gram points ; joint universality ; weak convergence
Abstract [eng] Let q(t) denote the increment of the argument of the product p−s/2G(s/2) along the segment connecting the points s = 1/2 and s = 1/2 + it, and tn denote the solution of the equation q(t) = (n − 1)p, n = 0, 1, . . . . The numbers tn are called the Gram points. In this paper, we consider the approximation of a collection of analytic functions by shifts in the Riemann zeta-function (z(s + ita k1), . . . , z(s + ita kr )), k = 0, 1, . . . , where a1, . . . , ar are different positive numbers not exceeding 1. We prove that the set of such shifts approximating a given collection of analytic functions has a positive lower density. For the proof, a discrete limit theorem on weak convergence of probability measures in the space of analytic functions is app.
Published Basel : MDPI
Type Journal article
Language English
Publication date 2023
CC license CC license description