Approximation of integrable functions by general linear operators of their fourier series

Citation
Zenski, W.odzimierz et Szal, Bogdan, Approximation of integrable functions by general linear operators of their fourier series, Acta mathematica Sinica. English series (Print) , 28(7), 2012, pp. 1119-1134
ISSN journal
14398516
Volume
28
Issue
7
Year of publication
2012
Pages
1119 - 1134
Database
ACNP
SICI code
Abstract
The pointwise estimates of the deviation T n,A,B f(·).f(·) in terms of moduli of continuity .w·f and w·f there are proved. Analogical results on norm approximation with remarks and corollaries are also given. In the results there are used the essentially weaker conditions than these in [Mittal, M. L.: J. Math. Anal. Appl., 220, 434.450 (1998) Theorem 1, p. 437].