Infinite dimensional extension of A. P. Calderòn's theorem on positive semidefinite biquadratic forms

zbMath1003.46013MaRDI QIDQ1612769

Mohamed El Kadiri, Belmesnaoui Aqzzouz

Publication date: 4 September 2002

Published in: Lobachevskii Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://eudml.org/doc/231500

zbMATH Keywords

positive operatorHilbert-Schmidt operatorpositive semidefinite biquadratic formsum of squares of bilinear forms

Mathematics Subject Classification ID

Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) (46C05) Multilinear and polynomial operators (47H60)

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