Communications of the
Korean Mathematical Society
CKMS

ISSN(Print) 1225-1763 ISSN(Online) 2234-3024

Article

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Commun. Korean Math. Soc. 1997; 12(4): 905-909

Printed December 1, 1997

Copyright © The Korean Mathematical Society.

A Six-Point Characterization of Hilbert Spaces

Jinsik Mok

Sunmoon University

Abstract

A characterization of Hilbert spaces is given in terms of four boundary points and two interior points of the unit sphere.

Keywords: Hilbert spaces, biconvex function

MSC numbers: 46C15