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چکیده
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In this paper, we derive an explicit expression of (P+Q)d of twomatrices P and Q, in terms of P, Q, Pd and Qd , assuming some conditions. And we also obtain representations for the Drazin inverse of complex block matrix A B C D (A and D are square) under some conditions. Finally, numerical examples are given to illustrate our results International Journal of Applied and Computational Mathematics
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