A polynomial characterization of Hilbert spaces

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Dahmane Achour
Khalil Saadi
In this paper, we obtain a new characterization of Hilbert spaces by means of
polynomial mappings, extending the linear result of Kwapień.

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Achour, Dahmane; Saadi, Khalil. «A polynomial characterization of Hilbert spaces». Collectanea Mathematica, 2010, vol.VOL 61, núm. 3, p. 291-0, https://raco.cat/index.php/CollectaneaMathematica/article/view/186613.