3 papers
math.FA2016
Generalized Kato decomposition and essential spectra
Miloš D. Cvetković, Snežana Č. Živković-Zlatanović
Let denote any of the following classes: upper (lower) semi-Fredholm operators, Fredholm operators, upper (lower) semi-Weyl operators, Weyl operators, upper (lower) semi-…
math.FA2016
Generalized Drazin invertibility of operator matrices
Miloš D Cvetković
We study the generalized Drazin invertibility as well as the Drazin and ordinary invertbility of an operator matrix (A C \\ 0 B) acting on a Banach or on a Hilbert space. As a cons…
math.FA2015
Generalized B-Fredholm Banach algebra elements
Milos D. Cvetkovic, Enrico Boasso, Snezana C. Zivkovic-Zlatanovic
Given a (not necessarily continuous) homomorphism between Banach algebras $\T\colon\A\to\B$, an element $a\in\A$ will be said to be B-Fredholm (respectively generalized B-Fredholm)…