Characterization of essential spectra by quasi-compact perturbations

On the analysis of some perturbed Browder's operators

S Bouzidi, N Moalla, I Walha - ANNALI DELL'UNIVERSITA'DI FERRARA, 2023 - Springer
In this paper, we are interested with a new class of perturbation named the Φ-perturbation
function which allowing us to derive some advances on the semi-Browder and Browder …
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