Spectral characterizations of central elements in Banach algebras
Volume 120 / 1996
Studia Mathematica 120 (1996), 47-52
DOI: 10.4064/sm-120-1-47-52
Abstract
Let A be a complex unital Banach algebra. We characterize elements belonging to Γ(A), the set of elements central modulo the radical. Our result extends and unifies several known characterizations of elements in Γ(A).
