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On criteria of Kasahara and Blumenthal for inner-product spaces
1. Historical remarks. It is the purpose of this paper to give related generalizations of two quite distinct recent generalizations of the Jordan-vonNeumann characterization of inner-product spaces. Kasahara2 [6] gave a condition characterizing inner-product spaces among normed linear spaces. In [1 ] and [2 ] Blumenthal gave conditions characterizing inner-product …