Lower bounds for \(n\)-term approximations.

DOI10.1023/A:1012345223121zbMATH Open1043.41018OpenAlexW2188626302MaRDI QIDQ1809977

B. S. Kashin

Publication date: 15 June 2003

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

Full work available at URL: https://doi.org/10.1023/a:1012345223121

zbMATH Keywords

normed spacelower boundfunction class\(n\)-term approximation with respect to orthonormal systemsuniformly bounded complete orthonormal system

Mathematics Subject Classification ID

Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis (42C05) Geometry and structure of normed linear spaces (46B20) Completeness of sets of functions in nontrigonometric harmonic analysis (42C30) Approximation by other special function classes (41A30) Approximation by arbitrary linear expressions (41A45)

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