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The notion of almost periodicity nontrivially generalizes the notion of periodicity. Strongly almost periodic sequences (=uniformly recurrent infinite words) first appeared in the field of symbolic dynamics, but then turned out to be…

Discrete Mathematics · Computer Science 2007-05-23 Yuri Pritykin

We prove that almost periodicity in the sense of distributions coincides with almost periodicity with respect to Stepanov's metric for the class of subharmonic functions in a horizontal strip. We also prove that Fourier coefficients of…

Complex Variables · Mathematics 2007-05-23 S. Favorov , A. Rakhnin

In the first part, we construct a cut and project scheme from a family $\{P_\varepsilon\}$ of sets verifying four conditions. We use this construction to characterize weighted Dirac combs defined by cut and project schemes and by continuous…

Mathematical Physics · Physics 2020-04-02 Nicolae Strungaru

We prove some basic properties of quasinearly subharmonic functions and quasinearly subharmonic functions in the narrow sense.

Complex Variables · Mathematics 2016-08-17 Mansour Kalantar

In this paper, we discuss the relationships between stability and almost periodicity for solutions of stochastic differential equations. Our essential idea is to get stability of solutions or systems by some inherited properties of Lyapunov…

Dynamical Systems · Mathematics 2016-09-20 Yong Li , Zhenxin Liu , Wenhe Wang

The main aim of this note is to introduce the notion of an almost anti-periodic function in Banach space. We prove some characterizations for this class of functions, investigating also its relationship with the classes of anti-periodic…

Functional Analysis · Mathematics 2019-03-15 Marko Kostić , Daniel Velinov

In this article we introduce a class of discontinuous almost automorphic functions which appears naturally in the study of almost automorphic solutions of differential equations with piecewise constant argument. Their fundamental properties…

Classical Analysis and ODEs · Mathematics 2013-06-06 A. Chavez , S. Castillo , M. Pinto

In this paper, we introduce and analyze several different notions of Weyl almost periodic functions and Weyl ergodic components in Lebesgue spaces with variable exponent $L^{p(x)}.$ We investigate the invariance of (asymptotical) Weyl…

Functional Analysis · Mathematics 2020-02-04 Marko Kostić

In this paper, we analyze multi-dimensional Besicovitch almost periodic type functions. We clarify the main structural properties for the introduced classes of Besicovitch almost periodic type functions, explore the notion of…

Functional Analysis · Mathematics 2022-02-23 Marko Kostić

The aim of this paper is to introduce and to study an algebra of almost periodic generalized functions containing the classical Bohr almost periodic functions as well as almost periodic Schwartz distributions

Functional Analysis · Mathematics 2011-02-22 Chikh Bouzar , Mohammed Taha Khalladi

We discuss the most common types of weight functions in harmonic analysis and how they occur in \tfa . As a general rule, submultiplicative weights characterize algebra properties, moderate weights characterize module properties,…

Functional Analysis · Mathematics 2011-04-27 Karlheinz Gröchenig

We study fundamental properties of the gamma process and their relation to various topics such as Poisson-Dirichlet measures and stable processes. We prove the quasi-invariance of the gamma process with respect to a large group of linear…

Probability · Mathematics 2007-05-23 N. Tsilevich , A. Vershik , M. Yor

In this note, we demonstrate the convergence of the Demailly approximation of a general (weakly) upper semi-continuous weight.

Complex Variables · Mathematics 2025-04-03 Shijie Bao , Qi'an Guan

We study the diffraction and dynamical properties of translation bounded weakly almost periodic measures. We prove that the dynamical hull of a weakly almost periodic measure is a weakly almost periodic dynamical system with unique minimal…

Dynamical Systems · Mathematics 2020-04-02 Daniel Lenz , Nicolae Strungaru

This paper presents a new proof of the results regarding the continuity of weighted estimates with respect to the characteristic of the weight. Here we first prove the result in the dyadic case which is "easier" and then by the use of the…

Classical Analysis and ODEs · Mathematics 2015-02-03 Nikolaos Pattakos

The pseudo-Gamma function is a key tool introduced recently by Cheng and Albeverio in the proof of \break the density hypothesis. This function is doubly symmetric, which means that it is reflectively symmetric about the real axis by the…

Number Theory · Mathematics 2022-09-14 Yuanyou Cheng , Gongbao Li , Juping Wang

In this paper we introduce an equivalence relation on the classes of almost periodic functions of a real or complex variable which is used to refine Bochner's result that characterizes these spaces of functions. In fact, with respect to the…

Complex Variables · Mathematics 2019-03-18 J. M. Sepulcre , T. Vidal

In this paper, we study norm almost periodic measures on locally compact Abelian groups. First, we show that the norm almost periodicity of $\mu$ is equivalent to the equi-Bohr almost periodicity of $\mu*g$ for all $g$ in a fixed family of…

Functional Analysis · Mathematics 2021-01-27 Timo Spindeler , Nicolae Strungaru

In this paper we prove that the cone $\PPD$ of positive, positive definite, discrete and strong almost periodic measures has an interesting property: given any positive and positive definite measure $\mu$ smaller than some measure in…

Mathematical Physics · Physics 2013-03-08 Nicolae Strungaru

In this paper, monic polynomials orthogonal with deformation of the Freud-type weight function are considered. These polynomials fullfill linear differential equation with some polynomial coefficients in their holonomic form. The aim of…

Classical Analysis and ODEs · Mathematics 2022-05-11 Abey S. Kelil , Appanah R. Appadu , Sama Arjika