5 citations · 8 across the 15 of their papers we have counts for
18 papers
A sufficient condition for uniform convergence of double sine series with p-bounded variation coefficients
Mateusz Kubiak, Bogdan Szal
In the present paper we will introduce a new class of double sequences called DGM (p, alpha, beta, gamma, r), which is the generalization of a class considered by Szal and Duzinkie…
A sufficient condition for uniform convergence of trigonometric series with p-bounded variation coefficients
Mateusz Kubiak, Bogdan Szal
In this paper we consider trigonometric series with p-bounded variation coefficients. We presented a sufficient condition for uniform convergance of such series in case p > 1. This…
Approximation by double second type delayed arithmetic mean of periodic functions in space
Xh. Z. Krasniqi, P. Kórus, B. Szal
In this paper, we give a degree of approximation of a function in the space by using the second type double delayed arithmetic means of its Fourier series. Such de…
Pointwise summability of Fourier-Laguerre series of integrable functions
Maciej Kubiak, Wlodzimierz Lenski, Bogdan Szal
We present an approximation version of the results of D. P. Gupta [ J. of Approx. Theory, 7 (1973), 226-238] A. N. S. Singroura [Proc. Japan Acad., 39 (4) (1963), 208-210] and G. S…
Pointwise approximation of functions by matrix operators of their Fourier series with - differences of the entries
Wlodzimierz Lenski, Bogdan Szal
We extend the results of Xh. Z. Krasniqi [Acta Comment. Univ. Tartu. Math. 17 (2013), 89-101] and the authors [Acta Comment. Univ. Tartu. Math. 13 (2009), 11-24]. to the case where…
On estimates of deviation of conjugate functions from matrix operators of their Fourier series by some expressions with -differences of the entries
Wlodzimierz Lenski, Bogdan Szal
We extend the results of the authors from [Abstract and Applied Analysis, Volume 2016, Article ID 9712878] to the case conjugate Fourier series.