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A modification of the parallelogram law characterization of Hilbert spaces. (English) Zbl 0051.08601
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References:
[1] Birkhoff, Garrett: Lattice Theory (Revised Edition). Amer. math. Soc. N. Y.1948. · Zbl 0033.10103
[2] Blumenthal L. M.: Distance Geometries. Columbia: University of Missouri 1938.
[3] Ellis, David: On the metric characterization of metric lattices. J. Indian Math. Soc.15, 152-154 (1951). · Zbl 0046.02802
[4] Halmos, Paul The Theory of Spectra Multiplicity (Mimeographed). Chicago: University of Chicago 1950.
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