Characterizations of inner product spaces by orthogonal vectors
2006 ◽
Vol 4
(1)
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pp. 1-6
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Keyword(s):
LetXbe a real normed space with unit closed ballB. We prove thatXis an inner product space if and only if it is true that wheneverx,yare points in?Bsuch that the line throughxandysupports22Bthenx?yin the sense of Birkhoff.
2018 ◽
pp. 339
Keyword(s):
2004 ◽
Vol 69
(2)
◽
pp. 327-340
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Keyword(s):
Keyword(s):
2021 ◽
Vol 3
(2)
◽
pp. 80
Keyword(s):
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2005 ◽
Vol 2005
(18)
◽
pp. 2883-2893
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2005 ◽
Vol 78
(2)
◽
pp. 199-210
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Keyword(s):