Some perturbation results for ascent and descent via measure of non-compactness
Copyright policy )Some perturbation results for ascent and descent via measure of non-compactness
The aim of this paper is to enlarge some known results from Fredholm and perturbation theory via measure of non-compactness. As applications, we focus on the study of the essential ascent and the essential descent spectra of an operator T defined on a given Banach space. Some perturbation results are also investigated.
- Université Ibn Zohr Morocco
- Prince Sattam Bin Abdulaziz University Saudi Arabia
- University of Sfax Tunisia
Linear relations (multivalued linear operators), ascent, perturbation, (Semi-) Fredholm operators; index theories, Spectrum, resolvent, descent, measure of non-compactness, Measures of noncompactness and condensing mappings, \(K\)-set contractions, etc.
Linear relations (multivalued linear operators), ascent, perturbation, (Semi-) Fredholm operators; index theories, Spectrum, resolvent, descent, measure of non-compactness, Measures of noncompactness and condensing mappings, \(K\)-set contractions, etc.
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