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Abstract and Applied Analysis
Volume 2016 (2016), Article ID 9712878, 10 pages
Research Article

On Estimates of Deviation of Functions from Matrix Operators of Their Fourier Series by Some Expressions with -Differences of the Entries

Faculty of Mathematics, Computer Science and Econometrics, University of Zielona Góra, Ulica Szafrana 4a, 65-516 Zielona Góra, Poland

Received 15 October 2015; Revised 11 February 2016; Accepted 23 March 2016

Academic Editor: Sergey Tikhonov

Copyright © 2016 Włodzimierz Łenski and Bogdan Szal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We generalize the results of Krasniqi 2012 and Wei and Yu 2012 to the case of -differences.