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Estimate for the Best Approximation of Summable Functions of Two Variables in Terms of Fourier Coefficients

An upper bound for the best approximation of periodic summable functions of two variables in the metric of L is obtained in terms of Fourier coefficients. Functions that can be represented by trigonometric series with coefficients satisfying a two-dimensional analog of the Boas–Telyakovskii conditio...

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Bibliographic Details
Date:	2004
Main Authors:	Kononovych, T. O., Кононович, Т. О.
Format:	Article
Language:	Ukrainian English
Published:	Institute of Mathematics, NAS of Ukraine 2004
Online Access:	https://umj.imath.kiev.ua/index.php/umj/article/view/3727
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Journal Title:	Ukrains’kyi Matematychnyi Zhurnal
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