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Relationship between the essential quasi-Fredholm spectrum and the closed-range spectrum, An

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dc.contributor.author Benharrat, MOHAMMED
dc.contributor.author Messirdi, BEKKAI
dc.date.accessioned 2019-06-24T10:16:10Z
dc.date.available 2019-06-24T10:16:10Z
dc.date.issued 2014
dc.identifier.uri http://e-biblio.univ-mosta.dz/handle/123456789/11097
dc.description.abstract J. P. Labrousse [13] studied and characterized in the case of Hilbert spaces, a relation of the essential quasi-Fredholm spectrum and the spectrum de ned by Goldberg in [9] by ec(A) = f 2 C ; R( I 􀀀 A) is not closedg. In this paper, we investigate this relation in the case of Banach spaces. A similar relation is given, if we consider a B-Fredholm spectrum instead of the essential quasi-Fredholm spectrum. en_US
dc.publisher Univ. Oradea Fasc. Mat. XXI (1) en_US
dc.subject (Semi-regular operators en_US
dc.subject Quasi-Fredholm operators en_US
dc.subject Kato type operators en_US
dc.subject Es- sential spectrum en_US
dc.subject Closed-range spectrum. en_US
dc.title Relationship between the essential quasi-Fredholm spectrum and the closed-range spectrum, An en_US
dc.type Article en_US


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