The representations of the Drazin inverse of sums of two matrices
In this paper, we give explicit expressions of (P+Q)(d) of two matrices P and Q, in terms of P,Q,P-d and Q(d), under the conditions that PQ(2) = -p(2)Q, p(2)Q(2) = 0 and PQ(2) = P(2)Q, QPQ = 0, p(2)Q(2) = 0. AMS classification: 15A09
representation drazin inverse