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Drazin invertibility of upper triangular operator matrices |
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| Authors: | D. S. Cvetković-Ilić V. Pavlović |
| Affiliation: | Department of Mathematics, Faculty of Science and Mathematics, University of Nis, Nis, Serbia. |
| Abstract: | In this paper, the existence is considered of a Drazin invertible completion of an upper triangular operator matrix. The proof of a recently published result is corrected. |
| Keywords: | Drazin spectrum left (right) Drazin invertibility ascent (descent) |