A Modification of the Parallelogram Law Characterization of Hilbert Spaces.
Mathematische Zeitschrift, Tome 59 (1953), pp. 94-96.

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Mots-clés : functional analysis
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     author = {David Ellis},
     title = {A {Modification} of the {Parallelogram} {Law} {Characterization} of {Hilbert} {Spaces.}},
     journal = {Mathematische Zeitschrift},
     pages = {94--96},
     publisher = {mathdoc},
     volume = {59},
     year = {1953},
     zbl = {0051.08601},
     url = {http://geodesic.mathdoc.fr/item/MZ_1953__59_169376/}
}
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David Ellis. A Modification of the Parallelogram Law Characterization of Hilbert Spaces.. Mathematische Zeitschrift, Tome 59 (1953), pp. 94-96. http://geodesic.mathdoc.fr/item/MZ_1953__59_169376/