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Semi-Fredholm operators and pure contractions in Hilbert space |
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| Authors: | Mohammed Benharrat Bekkai Messirdi |
| Institution: | 1. Department of Mathematics and Informatics, ENSET d’Oran, BP 1523, El M’naouar, Oran, Algeria 2. Department of Mathematics, University of Oran, BP 1524, El M’naouar, Oran, Algeria |
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