PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 40(54), pp. 6371 (1986) 

ON A FUNCTIONAL WHICH IS QUADRATIC ON AORTHOGONAL VECTORSHamid Drljevi\'cEkonomski fakultet, Mostar, YugoslaviaAbstract: Let $X$ be a complex Hilbert space, $\dim X\geq 3$ and $A$ be a bounded selfadjoint operator defined on $X$. We give a representation of a continuous functional $H$ defined on $X$ under the condition that $H$ is quadratic on $A$orthogonal vectors. Classification (MSC2000): 39B70 Full text of the article:
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