Spectra Originated from Fredholm Theory and Browder's Theorem

Abstract

We give a new characterization of Browder's theorem through equality between the pseudo B-Weyl spectrum and the generalized Drazin spectrum. Also, we will give conditions under which pseudo B-Fredholm and pseudo B-Weyl spectrum introduced in [11] and [30] become stable under commuting Riesz perturbations.2010 Mathematics Subject Classification. 47A53, 47B10.