Łenski, Włodzimierz Pointwise \((H,\Phi)\) strong approximation by Fourier series of \(L^\Psi\) integrable functions. (English) Zbl 1482.42007 Tamkang J. Math. 53, No. 1, 1-9 (2022). MSC: 42A24 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Tamkang J. Math. 53, No. 1, 1--9 (2022; Zbl 1482.42007) Full Text: DOI
Łenski, Włodzimierz Pointwise \((H,\Phi)\) strong approximation by Fourier series of \(L^{1}\) integrable functions. (English) Zbl 1401.42004 Result. Math. 73, No. 4, Paper No. 132, 17 p. (2018). MSC: 42A24 PDFBibTeX XMLCite \textit{W. Łenski}, Result. Math. 73, No. 4, Paper No. 132, 17 p. (2018; Zbl 1401.42004) Full Text: DOI arXiv
Kranz, Radoslawa; Lenski, Włodzimierz; Szal, Bogdan Pointwise strong approximation of almost periodic functions. (English) Zbl 1513.42014 Discuss. Math., Differ. Incl. Control Optim. 36, No. 1, 45-63 (2016). MSC: 42A24 PDFBibTeX XMLCite \textit{R. Kranz} et al., Discuss. Math., Differ. Incl. Control Optim. 36, No. 1, 45--63 (2016; Zbl 1513.42014) Full Text: DOI arXiv
Łenski, Włodzimierz; Szal, Bogdan Pointwise strong approximation of almost periodic functions in \(S^{1}\). (English) Zbl 1325.42003 Math. Inequal. Appl. 18, No. 2, 735-750 (2015). MSC: 42A24 42A75 42A10 40C05 41A25 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Math. Inequal. Appl. 18, No. 2, 735--750 (2015; Zbl 1325.42003) Full Text: DOI arXiv
Łenski, Włodzimierz; Szal, Bogdan On the degree of strong approximation of integrable functions in Stepanov sense. (English) Zbl 1307.42006 Hudzik, Henryk (ed.) et al., Function spaces X. Proceedings of the 10th international conference, Poznań, Poland, July 9–13, 2012. Warszawa: Polish Academy of Sciences, Institute of Mathematics (ISBN 978-83-86806-25-6/pbk). Banach Center Publications 102, 169-179 (2014). MSC: 42A75 42A24 42A10 41A25 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Banach Cent. Publ. 102, 169--179 (2014; Zbl 1307.42006) Full Text: DOI arXiv Link
Łenski, Włodzimierz; Szal, Bogdan Strong approximation of almost periodic functions. (English) Zbl 1309.42007 Math. Inequal. Appl. 17, No. 4, 1353-1364 (2014). Reviewer: Alexander Ulanovskii (Stavanger) MSC: 42A75 42A24 42A10 40C05 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Math. Inequal. Appl. 17, No. 4, 1353--1364 (2014; Zbl 1309.42007) Full Text: DOI arXiv
Łenski, Włodzimierz; Szal, Bogdan Applications of general monotone sequences to strong approximation by Fourier series. (English) Zbl 1297.42008 Indag. Math., New Ser. 25, No. 1, 122-130 (2014). Reviewer: László Leindler (Szeged) MSC: 42A24 41A25 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Szal}, Indag. Math., New Ser. 25, No. 1, 122--130 (2014; Zbl 1297.42008) Full Text: DOI
Łenski, Włodzimierz; Roszak, Bogdan On the pointwise strong approximation by \((C,1)(E,1)\) means. (English) Zbl 1215.42005 Hudzik, Henryk (ed.) et al., Function spaces VIII. Proceedings of the 8th conference on function spaces, Bȩdlewo, Poland, July 3–7, 2006. Warsaw: Polish Academy of Sciences, Institute of Mathematics. Banach Center Publications 79, 113-117 (2008). MSC: 42A24 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Roszak}, Banach Cent. Publ. 79, 113--117 (2008; Zbl 1215.42005) Full Text: Link
Lenski, Wlodzimierz; Kranz, Radoslawa On the rate of pointwise strong summability of orthogonal expansions. (English) Zbl 1136.42029 Rend. Circ. Mat. Palermo (2) 56, No. 2, 273-286 (2007). Reviewer: Richard A. Zalik (Auburn University) MSC: 42C15 41A10 PDFBibTeX XMLCite \textit{W. Lenski} and \textit{R. Kranz}, Rend. Circ. Mat. Palermo (2) 56, No. 2, 273--286 (2007; Zbl 1136.42029) Full Text: DOI
Łenski, W. Pointwise strong and very strong approximation of Fourier series. (English) Zbl 1136.41004 Acta Math. Hung. 115, No. 3, 215-233 (2007). Reviewer: László Leindler (Szeged) MSC: 41A25 42A24 PDFBibTeX XMLCite \textit{W. Łenski}, Acta Math. Hung. 115, No. 3, 215--233 (2007; Zbl 1136.41004) Full Text: DOI
Łenski, Włodzimierz; Kranz, Radosława On the pointwise strong approximation by orthogonal expansions. (English) Zbl 1214.42063 Proceedings of the fifth international conference on functional analysis and approximation theory, Acquafredda di Maratea (Potenza), Italy, June 16–23, 2004. Palermo: Circolo Matemàtico di Palermo. Supplemento ai Rendiconti del Circolo Matemàtico di Palermo. Serie II 76, 445-458 (2005). MSC: 42C15 41A10 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{R. Kranz}, Suppl. Rend. Circ. Mat. Palermo (2) 76, 445--458 (2005; Zbl 1214.42063)
Łenski, Włodzimierz Pointwise very strong approximation as a generalization of Fejér’s summation theorem. (English) Zbl 1109.42001 Ann. Math. Inform. 32, 79-86 (2005). MSC: 42A24 PDFBibTeX XMLCite \textit{W. Łenski}, Ann. Math. Inform. 32, 79--86 (2005; Zbl 1109.42001) Full Text: EuDML
Łenski, Włodzimierz; Roszak, Bogdan On the rate of pointwise strong summability of Fourier series. (English) Zbl 1057.42003 Demonstr. Math. 37, No. 3, 601-610 (2004). Reviewer: László Leindler (Szeged) MSC: 42A10 42A24 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{B. Roszak}, Demonstr. Math. 37, No. 3, 601--610 (2004; Zbl 1057.42003)
Łenski, Włodzimierz; Topolewska, Maria On the rate of strong summability of double Fourier series. (English) Zbl 0936.42007 Math. Bohem. 123, No. 4, 337-363 (1998). Reviewer: J.Fuka (Praha) MSC: 42B08 40F05 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{M. Topolewska}, Math. Bohem. 123, No. 4, 337--363 (1998; Zbl 0936.42007) Full Text: EuDML
Łenski, Włodzimierz; Topolewska, Maria On the speed of strong summability of double Fourier series. (English) Zbl 0895.42004 Funct. Approximatio, Comment. Math. 25, 77-90 (1997). Reviewer: S.M.Mazhar (Kuwait) MSC: 42B05 42B08 PDFBibTeX XMLCite \textit{W. Łenski} and \textit{M. Topolewska}, Funct. Approximatio, Comment. Math. 25, 77--90 (1997; Zbl 0895.42004)
Łenski, Włodzimierz On the generalization of strong summability of double Fourier series. (English) Zbl 0843.42006 Acta Sci. Math. 60, No. 3-4, 515-526 (1995). Reviewer: L.Leindler (Szeged) MSC: 42B08 PDFBibTeX XMLCite \textit{W. Łenski}, Acta Sci. Math. 60, No. 3--4, 515--526 (1995; Zbl 0843.42006)
Łenski, Włodzimierz On the degree of almost strong convergence of Fourier series. (English) Zbl 0751.42003 Ann. Soc. Math. Pol., Ser. I, Commentat. Math. 30, No. 2, 383-392 (1991). MSC: 42A20 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Ann. Soc. Math. Pol., Ser. I, Commentat. Math. 30, No. 2, 383--392 (1991; Zbl 0751.42003)
Łenski, W. On the rate of pointwise strong \((C,\alpha{})\)-summability of Fourier series. (English) Zbl 0761.42004 Approximation theory, Proc. Conf., Kecskemét/Hung. 1990, Colloq. Math. Soc. János Bolyai 58, 453-468 (1991). Reviewer: L.Leindler (Szeged) MSC: 42A24 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Colloq. Math. Soc. János Bolyai 58, 453--468 (1991; Zbl 0761.42004)
Łenski, Włodzimierz On the rate of almost strong summability of Fourier series. (English) Zbl 0732.42004 Ann. Soc. Math. Pol., Ser. I, Commentat. Math. 30, No. 1, 93-100 (1990). MSC: 42A24 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Ann. Soc. Math. Pol., Ser. I, Commentat. Math. 30, No. 1, 93--100 (1990; Zbl 0732.42004)
Łenski, Włodzimierz On the strong approximation by (C,\(\alpha\) )-means of Fourier series. (English) Zbl 0725.42005 Math. Nachr. 146, 207-220 (1990). Reviewer: L.Leindler (Szeged) MSC: 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Math. Nachr. 146, 207--220 (1990; Zbl 0725.42005) Full Text: DOI
Łenski, Włodzimierz On the degrees of strong approximation by some trigonometric polynomials. (English) Zbl 0704.42007 Funct. Approximatio, Comment. Math. 16, 135-147 (1988). Reviewer: S.Aljančić MSC: 42A15 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Funct. Approximatio, Comment. Math. 16, 135--147 (1988; Zbl 0704.42007)
Łenski, Włodzimierz On the almost strong summability and convergence of Fourier series. (English) Zbl 0823.42003 Funct. Approximatio, Comment. Math. 16, 125-134 (1988). MSC: 42A20 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Funct. Approximatio, Comment. Math. 16, 125--134 (1988; Zbl 0823.42003)
Łenski, W. On strong approximation by logarithmic means of Fourier series. (English) Zbl 0606.42002 Acta Sci. Math. 48, 285-295 (1985). Reviewer: J.Musielak MSC: 42A10 PDFBibTeX XMLCite \textit{W. Łenski}, Acta Sci. Math. 48, 285--295 (1985; Zbl 0606.42002)
Lenski, Wlodzimierz On the degree of strong approximation of functions belonging to the space \(L^ p \)(1<p<infinity). (English) Zbl 0511.42009 Funct. Approximatio, Comment. Math. 13, 77-83 (1982). MSC: 42A24 42A05 42A10 40F05 PDFBibTeX XMLCite \textit{W. Lenski}, Funct. Approximatio, Comment. Math. 13, 77--83 (1982; Zbl 0511.42009)
Lenski, Wlodzimierz On the degree of strong approximation of integrable functions. (English) Zbl 0511.42008 Funct. Approximatio, Comment. Math. 12, 35-44 (1982). MSC: 42A24 42A10 40F05 PDFBibTeX XMLCite \textit{W. Lenski}, Funct. Approximatio, Comment. Math. 12, 35--44 (1982; Zbl 0511.42008)
Lenski, Wlodzimierz Strong approximation of double Fourier series. (English) Zbl 0401.42016 Funct. Approximatio, Comment. Math. 4, 71-83 (1976). MSC: 42B05 PDFBibTeX XMLCite \textit{W. Lenski}, Funct. Approximatio, Comment. Math. 4, 71--83 (1976; Zbl 0401.42016)