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Relation between Fourier series and Wiener algebras

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Abstract

New relations between the Banach algebras of absolutely convergent Fourier integrals of complex-valued measures of Wiener and various issues of trigonometric Fourier series (see classical monographs by A. Zygmund [1] and N. K. Bary [2]) are described. Those bilateral interrelations allow one to derive new properties of the Fourier series from the known properties of the Wiener algebras, as well as new results to be obtained for those algebras from the known properties of Fourier series. For example, criteria, i.e. simultaneously necessary and sufficient conditions, are obtained for any trigonometric series to be a Fourier series, or the Fourier series of a function of bounded variation, and so forth. Approximation properties of various linear summability methods of Fourier series (comparison, approximation of function classes and single functions) and summability almost everywhere (often with the set indication) are considered.

The presented material was reported by the author on 12.02.2021 at the Zoom-seminar on the theory of real variable functions at the Moscow State University.

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Authors and Affiliations

  1. Sumy State University, Sumy, Ukraine

    Roald M. Trigub

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  1. Roald M. Trigub
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Correspondence to Roald M. Trigub.

Additional information

Translated from Ukrains’kiĭ Matematychnyĭ Visnyk, Vol. 18, No. 1, pp. 80–103, January–March, 2021.

Translated from Russian by O.I. Voitenko

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Trigub, R.M. Relation between Fourier series and Wiener algebras. J Math Sci 256, 785–802 (2021). https://doi.org/10.1007/s10958-021-05461-9

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  • DOI: https://doi.org/10.1007/s10958-021-05461-9

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