An analytic approach to the spectral characterization of the radical
Volume 186 / 2008
Studia Mathematica 186 (2008), 11-14
MSC: Primary 46H10.
DOI: 10.4064/sm186-1-2
Abstract
We give a simple complex-variable proof of an old result of Zemánek and Le Page on the radical of a Banach algebra. Incidentally, the argument also proves a recent result of Harris and Kadison.
