316 research outputs found
Orthogonal forms and orthogonality preservers on real function algebras
We initiate the study of orthogonal forms on a real C-algebra. Motivated
by previous contributions, due to Ylinen, Jajte, Paszkiewicz and Goldstein, we
prove that for every continuous orthogonal form on a commutative real
C-algebra, , there exist functionals and in
satisfying for every
in . We describe the general form of a (not-necessarily continuous)
orthogonality preserving linear map between unital commutative real
C-algebras. As a consequence, we show that every orthogonality preserving
linear bijection between unital commutative real C-algebras is continuous.Comment: To appear in Linear and Multilinear Algebr
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