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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 |
