Über eine Turánsche Ungleichung mit reellen Charakteren
En généralisant dans [De Roton] le théorème de Beurling et Nyman à la classe de Selberg, nous avons reformulé l’hypothèse de Riemann généralisée en terme d’un problème d’approximation. Nous poursuivons ici ce travail de généralisation par l’étude d’une distance liée à ce problème. Nous donnons une minoration de cette distance, ce qui constitue une extension du travail de Burnol [7] et de celui de Báez-Duarte, Balazard, Landreau et Saias [2], travail qui concernait la fonction de Riemann et que...
Higher-order non-holomorphic Eisenstein series associated to a Fuchsian group are defined by twisting the series expansion for classical non-holomorphic Eisenstein series by powers of modular symbols. Their functional identities include multiplicative and additive factors, making them distinct from classical Eisenstein series. In this article we prove the meromorphic continuation of these series and establish their functional equations which relate values at and . In addition, we construct...
In the paper, we give a survey of the results on the approximation of analytic functions by shifts of Hurwitz zeta-functions. Theorems of such a kind are called universality theorems. Continuous, discrete and joint universality theorems of Hurwitz zeta-functions are discussed.
We prove explicit upper bounds for the density of universality for Dirichlet series. This complements previous results [15]. Further, we discuss the same topic in the context of discrete universality. As an application we sharpen and generalize an estimate of Reich concerning small values of Dirichlet series on arithmetic progressions in the particular case of the Riemann zeta-function.
In this paper, we give certain upper bounds for the 2k-th moments, k ≥ 1/2, of derivatives of Dirichlet L-functions at s = 1/2 under the assumption of the Generalized Riemann Hypothesis.