Jordan *-derivation pairs and quadratic functionals on modules over *-rings. (Summary).
Borut Zalar (1996)
Aequationes mathematicae
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Displaying similar documents to “Jordan *-derivation pairs and quadratic functionals on modules over *-rings.”
Jordan *-derivation pairs and quadratic functionals on modules over *-rings. (Summary).
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Motivated by Problem 2 in [2], Jordan *-derivation pairs and n-Jordan *-mappings are studied. From the results on these mappings, an affirmative answer to Problem 2 in [2] is given when E = F in (1) or when 𝓐 is unital. For the general case, we prove that every Jordan *-derivation pair is automatically real-linear. Furthermore, a characterization of a non-normal prime *-ring under some mild assumptions and a representation theorem for quasi-quadratic functionals are provided. ...
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Quadratic functionals on modules over complex Banach *-algebras with an approximate identity
Dijana Ilišević (2005)
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The problem of representability of quadratic functionals by sesquilinear forms is studied in this article in the setting of a module over an algebra that belongs to a certain class of complex Banach *-algebras with an approximate identity. That class includes C*-algebras as well as H*-algebras and their trace classes. Each quadratic functional acting on such a module can be represented by a unique sesquilinear form. That form generally takes values in a larger algebra than the given...