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Drazin invertibility of upper triangular operator matrices
Authors:D S Cvetković-Ilić  V Pavlović
Institution: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)
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