• Title/Summary/Keyword: characterization.

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A six-point characterization of Hilbert spaces

  • Mok, Jin-Sik
    • Communications of the Korean Mathematical Society
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    • v.12 no.4
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    • pp.905-909
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    • 1997
  • A characterization of Hilbert spaces is given in terms of four boundary points and two interior points of the unit sphere.

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A metric characterization of Hilbert spaces

  • Mok, Jin-Sik
    • Bulletin of the Korean Mathematical Society
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    • v.33 no.1
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    • pp.35-38
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    • 1996
  • The aim of this paper is to present a characterization of Hilbert spaces in terms of the lengths of four sides and two diagonals of a parallelogram.

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