scientific article
zbMath0442.41028MaRDI QIDQ3884569
Publication date: 1979
Full work available at URL: http://matwbn.icm.edu.pl/tresc.php?wyd=5&tom=4
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Banach spaceextremal problemsisoperimetric problemZolotarev polynomialsChebychev polynomialsspline spacesinterpolating spacesN-widthbest approximation of a fixed elementFavard's functionslegendre polynomials
Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.) (33C45) Best approximation, Chebyshev systems (41A50) Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) (41A65) Interpolation in approximation theory (41A05) Approximation by polynomials (41A10) Approximation by arbitrary nonlinear expressions; widths and entropy (41A46)
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