Kozynenko, O.; Skorokhodov, D. Kolmogorov-type inequalities for the norms of fractional derivatives of functions defined on the positive half line. (English. Ukrainian original) Zbl 1475.26017 Ukr. Math. J. 72, No. 10, 1579-1594 (2021); translation from Ukr. Mat. Zh. 72, No. 10, 1372-1385 (2020). Reviewer: James Adedayo Oguntuase (Abeokuta) MSC: 26D10 26A33 PDFBibTeX XMLCite \textit{O. Kozynenko} and \textit{D. Skorokhodov}, Ukr. Math. J. 72, No. 10, 1579--1594 (2021; Zbl 1475.26017); translation from Ukr. Mat. Zh. 72, No. 10, 1372--1385 (2020) Full Text: DOI
Davydov, Oleg; Kozynenko, Oleksandr; Skorokhodov, Dmytro Optimal approximation order of piecewise constants on convex partitions. (English) Zbl 1486.65020 J. Complexity 58, Article ID 101444, 14 p. (2020). Reviewer: Yuri A. Farkov (Moskva) MSC: 65D15 41A46 PDFBibTeX XMLCite \textit{O. Davydov} et al., J. Complexity 58, Article ID 101444, 14 p. (2020; Zbl 1486.65020) Full Text: DOI arXiv