Matrix Summability of Walsh–Fourier Series

Ushangi Goginava, Károly Nagy

Research output: Contribution to journalArticlepeer-review

Abstract

The presented paper discusses the matrix summability of the Walsh–Fourier series. In particular, we discuss the convergence of matrix transforms in (Formula presented.) space and in (Formula presented.) space in terms of modulus of continuity and matrix transform variation. Moreover, we show the sharpness of our result. We also discuss some properties of the maximal operator (Formula presented.) of the matrix transform of the Walsh–Fourier series. As a consequence, we obtain the sufficient condition so that the matrix transforms (Formula presented.) of the Walsh–Fourier series are convergent almost everywhere to the function f. The problems listed above are related to the corresponding Lebesgue constant of the matrix transformations. The paper sets out two-sides estimates for Lebesgue constants. The proven theorems can be used in the case of a variety of summability methods. Specifically, the proven theorems are used in the case of Cesàro means with varying parameters.

Original languageEnglish
Article number2458
JournalMathematics
Volume10
Issue number14
DOIs
Publication statusPublished - Jul 2022

Keywords

  • almost everywhere convergence and divergence
  • Cesaro mean
  • convergence in norm
  • logarithmic means
  • martingale transform
  • matrix transforms
  • Walsh system
  • weak type inequality

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • General Mathematics
  • Engineering (miscellaneous)

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