On approximation properties of complete orthonormal systems

zbMath0635.42030MaRDI QIDQ1097454

Boris S. Kashin

Publication date: 1987

Published in: Proceedings of the Steklov Institute of Mathematics (Search for Journal in Brave)

Mathematics Subject Classification ID

General harmonic expansions, frames (42C15) Completeness of sets of functions in nontrigonometric harmonic analysis (42C30) Approximation by other special function classes (41A30)

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