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Improved results on the Drazin inverse of a 2 × 2 block matrix in terms of Banachiewicz-Schur forms

Abstract.In this paper, we derive a representation for the Drazin inverse of a block matrix M=( A B C D ) under the assumptions 𝐴𝐴𝜋𝐵 = 0, 𝐶𝐴𝜋𝐵 ...