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Coconvex approximation of periodic functions

The Jackson inequality E n (f ) &le; c &omega; 3 (f , &pi; / n ) connects the value of the best uniform approximation E n (f ) of a 2&pi;-periodic function f : R &rarr; R by trigonometric polynomials of order &le; n — 1 with its third modulus...

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Bibliographic Details
Date:	2007
Main Authors:	Zalizko, V. D., Залізко, В. Д.
Format:	Article
Language:	Ukrainian English
Published:	Institute of Mathematics, NAS of Ukraine 2007
Online Access:	https://umj.imath.kiev.ua/index.php/umj/article/view/3290
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Journal Title:	Ukrains’kyi Matematychnyi Zhurnal
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