Krasniqi, Xhevat Z.; Lenski, Włodzimierz; Szal, Bogdan Approximation by some subsequences of matrix means. (English) Zbl 1484.42007 Lith. Math. J. 62, No. 1, 28-42 (2022). MSC: 42A24 41A25 42A10 PDFBibTeX XMLCite \textit{X. Z. Krasniqi} et al., Lith. Math. J. 62, No. 1, 28--42 (2022; Zbl 1484.42007) Full Text: DOI
Łenski, Włodzimierz; Szal, Bogdan Pointwise approximation of functions by matrix operators of their Fourier series with \(r\)-differences of the entries. (English) Zbl 1462.42007 Lith. Math. J. 60, No. 4, 494-512 (2020). MSC: 42A24 41A25 42A10 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Lith. Math. J. 60, No. 4, 494--512 (2020; Zbl 1462.42007) Full Text: DOI arXiv
Kubiak, Mateusz; Łenski, Włodzimierz; Szal, Bogdan Pointwise approximation of modified conjugate functions by matrix operators of conjugate Fourier series of \(2\pi /r\)-periodic functions. (English) Zbl 1497.42008 J. Inequal. Appl. 2018, Paper No. 92, 14 p. (2018). MSC: 42A24 42A10 42A20 42A50 PDFBibTeX XMLCite \textit{M. Kubiak} et al., J. Inequal. Appl. 2018, Paper No. 92, 14 p. (2018; Zbl 1497.42008) Full Text: DOI
Łenski, Włodzimierz; Szal, Bogdan Pointwise approximation of \(2 \pi/r\)-periodic functions by matrix operators of their Fourier series with \(r\)-differences of the entries. (English) Zbl 1404.42007 Demonstr. Math. 51, 309-322 (2018). MSC: 42A24 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Demonstr. Math. 51, 309--322 (2018; Zbl 1404.42007) Full Text: DOI
Łenski, Włodzimierz; Szal, Bogdan Pointwise approximation of modified conjugate functions by matrix operators of their Fourier series. (English) Zbl 1392.42008 Proc. Est. Acad. Sci. 67, No. 1, 50-60 (2018). MSC: 42A50 42A10 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Proc. Est. Acad. Sci. 67, No. 1, 50--60 (2018; Zbl 1392.42008) Full Text: DOI
Łenski, W.; Szal, B. Approximation of functions from \(L^p(\omega)_\beta\) by general linear operators. (English) Zbl 1374.42010 Acta Math. Hung. 147, No. 2, 457-476 (2015). Reviewer: Pascal Lefèvre (Lens) MSC: 42A24 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Acta Math. Hung. 147, No. 2, 457--476 (2015; Zbl 1374.42010) Full Text: DOI
Łenski, W.; Szal, B. On pointwise approximation of conjugate functions by some hump matrix means of conjugate Fourier series. (English) Zbl 1321.42009 J. Funct. Spaces 2015, Article ID 470205, 9 p. (2015). MSC: 42A24 42A50 42A10 40C05 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, J. Funct. Spaces 2015, Article ID 470205, 9 p. (2015; Zbl 1321.42009) Full Text: DOI
Kranz, Radosława; Łenski, Włodzimierz; Szal, Bogdan Approximation of functions from \(L^p(\omega)_\beta\) by matrix means of their Fourier series. (English) Zbl 1261.42003 Indian J. Pure Appl. Math. 43, No. 5, 475-494 (2012). MSC: 42A10 PDFBibTeX XMLCite \textit{R. Kranz} et al., Indian J. Pure Appl. Math. 43, No. 5, 475--494 (2012; Zbl 1261.42003) Full Text: DOI arXiv