Quadratic inequalities and a characterization of inner product

DOI10.7153/MIA-15-50zbMath1261.46015OpenAlexW2314957712MaRDI QIDQ2911473

Janusz Matkowski

Publication date: 31 August 2012

Published in: Mathematical Inequalities & Applications (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.7153/mia-15-50

zbMATH Keywords

inner productquadratic functionalquadratic inequalityparallelogram equalityJordan-von Neumann theorem

Mathematics Subject Classification ID

Functional equations for real functions (39B22) Characterizations of Hilbert spaces (46C15) Inequalities for sums, series and integrals (26D15) Orthogonal additivity and other conditional functional equations (39B55)

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