Subbotin, Yu. N.; Telyakovskii, S. A. On the equality of Kolmogorov and relative widths of classes of differentiable functions. (English. Russian original) Zbl 1192.46023 Math. Notes 86, No. 3, 432-439 (2009); translation from Mat. Zametki 86, No. 3, 456-465 (2009); erratum Math. Notes 87, No. 3, 452 (2010). Reviewer: Daniel Wulbert (La Jolla) MSC: 46E15 41A46 PDFBibTeX XMLCite \textit{Yu. N. Subbotin} and \textit{S. A. Telyakovskii}, Math. Notes 86, No. 3, 432--439 (2009; Zbl 1192.46023); translation from Mat. Zametki 86, No. 3, 456--465 (2009); erratum Math. Notes 87, No. 3, 452 (2009) Full Text: DOI
Dirik, Fadime; Duman, Oktay; Demirci, Kamil Statistical approximation to Bögel-type continuous and periodic functions. (English) Zbl 1179.41011 Cent. Eur. J. Math. 7, No. 3, 539-549 (2009). MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{F. Dirik} et al., Cent. Eur. J. Math. 7, No. 3, 539--549 (2009; Zbl 1179.41011) Full Text: DOI