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Degrees of the approximations by some special matrix means of conjugate Fourier series

Kranz Radosława, Rzepka Aleksandra, Sylwestrzak-Maślanka Ewa

Demonstratio Mathematica

2019

Vol. 52, nr 1

116--129

In this paper we will present the pointwise and normwise estimations of the deviations considered by W. Łenski, B. Szal, [Acta Comment. Univ. Tartu. Math., 2009, 13, 11-24] and S. Saini, U. Singh, [Boll. Unione Mat. Ital., 2016, 9, 495-504] under general assumptions on the class considered sequences defining the method of the summability. We show that the obtained estimations are the best possible for some subclasses of Lp by constructing the suitable type of functions.