A Six-Point Characterization of Hilbert Spaces
Commun. Korean Math. Soc. 1997 Vol. 12, No. 4, 905-909
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
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