Commun. Korean Math. Soc. 1997; 12(4): 905-909
Printed December 1, 1997
Copyright © The Korean Mathematical Society.
Jinsik Mok
Sunmoon University
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
2017; 32(2): 333-352
more +
© 2022. The Korean Mathematical Society. Powered by INFOrang Co., Ltd