Behavior of Lebesgue constants for linear methods of summing fourier series giving the best order approximation

DOI10.1007/BF01057496zbMath0646.41016OpenAlexW1981487389MaRDI QIDQ3790037

A. V. Kushpel'

Publication date: 1987

Published in: Ukrainian Mathematical Journal (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/bf01057496

zbMATH Keywords

widthscontinuous linear projectionextremal subspacesKolmogorov n-diametersk-splines

Mathematics Subject Classification ID

Series expansions (e.g., Taylor, Lidstone series, but not Fourier series) (41A58) Approximation by arbitrary nonlinear expressions; widths and entropy (41A46)

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