Geodesic
On a Functional Which is Quadratic on A-orthogonal Vectors
Publications de l'Institut Mathématique, _N_S_40 (1986) no. 54, p. 63 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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 : 39B70 
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     author = {Hamid Drljevi\'c},
     title = {On a {Functional} {Which} is {Quadratic} on {A-orthogonal} {Vectors}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {63 },
     publisher = {mathdoc},
     volume = {_N_S_40},
     number = {54},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1986_N_S_40_54_a7/}
}
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Hamid Drljević. On a Functional Which is Quadratic on A-orthogonal Vectors. Publications de l'Institut Mathématique, _N_S_40 (1986) no. 54, p. 63 . http://geodesic.mathdoc.fr/item/PIM_1986_N_S_40_54_a7/