Results 11 to 20 of about 30 (22)
On some classes of almost periodic functions in abstract spaces
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 61, Page 3237-3247, 2004., 2004 We deal with C(n)‐almost periodic functions taking values in a Banach space. We give several properties of such functions, in particular, we investigate their behavior in view of differentiation as well as integration. The superposition operator acting in the space of such functions is also under consideration.
Dariusz Bugajewski +1 more
wiley +1 more source
Block Toeplitz operators with frequency‐modulated semi‐almost periodic symbols
International Journal of Mathematics and Mathematical Sciences, Volume 2003, Issue 34, Page 2157-2176, 2003., 2003 This paper is concerned with the influence of frequency modulation on the semi‐Fredholm properties of Toeplitz operators with oscillating matrix symbols. The main results give conditions on an orientation‐preserving homeomorphism α of the real line that ensure the following: if b belongs to a certain class of oscillating matrix functions (periodic ...
A. Böttcher, S. Grudsky, I. Spitkovsky
wiley +1 more source
Open Mathematics, 2018 In this paper, we introduce the concept of Sp-pseudo almost periodicity on time scales and present some basic properties of it, including the translation invariance, uniqueness of decomposition, completeness and composition theorem.
Tang Chao-Hong, Li Hong-Xu
doaj +1 more source
ON COMPACTNESS OF C(n)-ALMOST PERIODIC FUNCTIONS
, 1999 In this paper we give a compactness criterion for -almost periodic functions. Some properties of these functions are shown. 1. Preliminaries We first recall the basic notations related to Steklov functions and C ^ -almost periodic functions.
M. Adamczak
semanticscholar +1 more source
(VC)(n)-ALMOST PERIODIC FUNCTIONS
, 1999 In this note we give the definition and some properties of (VC)^^-almost periodic functions, i.e. uniformly almost periodic and almost periodic in variation functions with first n derivatives.
S. Stoiński
semanticscholar +1 more source
Almost periodic functions on time scales and their properties
Open MathematicsIn this article, we first propose a concept of almost periodic functions on arbitrary time scales, which is defined by trigonometric polynomial approximations with respect to supremum norm, and study some basic properties of these kinds of functions ...
Li Yongkun, Huang Xiaoli
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Weyl almost periodic functions on time scales and their Fourier series
Demonstratio MathematicaIn this paper, firstly, we propose a concept of Weyl almost periodic functions on time scales by trigonometric polynomial approximation, and study some basic properties of Weyl almost periodic functions on time scales.
Li Yongkun, Huang Xiaoli
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On the spectra of some Toeplitz and Wiener-Hopf operators with almost periodic matrix symbols
, 2008 Abraham Isgur, I. Spitkovsky
semanticscholar +1 more source