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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.
Notes
No potential conflict of interest was reported by the authors.
Additional information
Funding
The work of the first author is supported by [grant number 174007] of the Ministry of Science, Technology and Development, Republic of Serbia and the work of the second author is supported by [grant number 174025] of the Ministry of Science, Technology and Development, Republic of Serbia.