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math.SP2018
Toplogical uniform descent, quasi-Fredholmness and operators originated from semi-B-Fredholm theory
Snežana Č. Živković-Zlatanović, Mohammed Berkani
In this paper we study operators originated from semi-B-Fredholm theory and as a consequence we get some results regarding boundaries and connected hulls of the corresponding spect…
math.SP2018
Pseudo-B-Fredholm operators, poles of the resolvent and mean convergence in the Calkin Algebra
Mohammed Berkani, Snežana Č. Živković-Zlatanović
We define here a pseudo B-Fredholm operator as an operator such that 0 is isolated in its essential spectrum, then we prove that an operator is pseudo- B-Fredholm if and only i…