Abstract

It is proved that if the Fourier coefficients (an) of /E L!(0, ir) satisfy (*)L" kp\Aan\p = o(l), for some 1

< 2, then \\sn- f\\ = o(l), if and only if a" lg n * o(l). For cosine trigonometric series with coefficients of bounded variation and satisfying (*) it is proved that a necessary and sufficient condition for the series to be a Fourier series is (an) E 6, where G is the Garrett-Stanojevic [4] class. © 1982 American Mathematical Society.

Department(s)

Mathematics and Statistics

Keywords and Phrases

Integrability of cosine series; Ll-convergence of Fourier series

International Standard Serial Number (ISSN)

0002-9947

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 American Mathematical Society, All rights reserved.

Publication Date

01 Jan 1982

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