On a problem of H. Berens
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Publication:790378
DOI10.1007/BF01457130zbMath0534.41022MaRDI QIDQ790378
Publication date: 1983
Published in: Mathematische Annalen (Search for Journal in Brave)
Full work available at URL: https://eudml.org/doc/163746
Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) (41A65) Uniqueness of best approximation (41A52) Inner product spaces and their generalizations, Hilbert spaces (46C99)
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