Stability of relative essential spectra of the transport operator in L1-space by means of measures of noncompactness and relative weak demicompactness

The paper is devoted to some new sufficient conditions to ensure the upper-Fredholmness and Fredholmness of an unbounded densely defined linear operator T acting on a Banach space. Some characterizations of the relative essential spectra of T are also given. These characterizations are developed by...

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Veröffentlicht in:	Monatshefte für Mathematik 2022, Vol.198 (4), p.653-674
Hauptverfasser:	Chelly, Slim, Jeribi, Aref, Krichen, Bilel
Format:	Artikel
Sprache:	eng
Schlagworte:	Banach spaces Linear operators Mathematics Mathematics and Statistics Perturbation Spectra
Online-Zugang:	Volltext
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