Ming-Hsiu Hsu

Linear maps on W⁎-algebras preserving elements annihilated by a continuous function

Denote by F either the real field R or the complex field C . Let f : F → F be a continuous function such that its zero set Z F ( f ) contains an isolated point and at least one other point. For a given λ ∈ F , the zero set Z F ( f ) is said to be λ -convex if λ Z F ( f ) + ( 1 −...