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Character sums over unions of intervals

  • Xuancheng Shao EMAIL logo
Veröffentlicht/Copyright: 10. Januar 2014

Abstract

Let q be a cube-free positive integer and χ(modq) be a non-principal Dirichlet character. Our main result is a Burgess-type estimate for nAχ(n), where A[1,q] is the union of s disjoint intervals I1,...,Is. We obtain a nontrivial estimate for the character sum over A whenever |A|s-1/2>q1/4+ϵ and each interval Ij (1js) has length |Ij|>qϵ for any ϵ>0. This follows from an improvement of a mean value Burgess-type estimate studied by Heath-Brown [Number Theory and Related Fields, Springer Proc. Math. Statist. 43, New York (2013), 199–213].

MSC: 11L40

The author is very thankful to his advisor, K. Soundararajan, for proposing the smoothing technique used in the proof of Proposition 1.3 which greatly simplifies the argument, as well as his useful suggestions on exposition, and to I. Shparlinski for pointing to the references [Proc. Steklov Inst. Math. 280 (2013), 67–96; Indag. Math. (2013), DOI 10.1016/j.indag. 2013.02.005].

Received: 2013-5-16
Revised: 2013-10-24
Published Online: 2014-1-10
Published in Print: 2015-9-1

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