TY - JOUR

T1 - Generalized inverses over integral domains. II. group inverses and Drazin inverses

AU - Manjunatha Prasad, K.

AU - Bhaskara Rao, K. P S

AU - Bapat, R. B.

PY - 1991/2/15

Y1 - 1991/2/15

N2 - This is a continuation of an earlier paper by the authors on generalized inverses over integral domains. The main results consist of necessary and sufficient conditions for the existence of a group inverse, a new formula for a group inverse when it exists, and necessary and sufficient conditions for the existence of a Drazin inverse. We show that a square matrix A of rank r over an integral domain R has a group inverse if and only if the sum of all r × r principal minors of A is an invertible element of R. We also show that the group inverse of A when it exists is a polynomial in A with coefficients from R.

AB - This is a continuation of an earlier paper by the authors on generalized inverses over integral domains. The main results consist of necessary and sufficient conditions for the existence of a group inverse, a new formula for a group inverse when it exists, and necessary and sufficient conditions for the existence of a Drazin inverse. We show that a square matrix A of rank r over an integral domain R has a group inverse if and only if the sum of all r × r principal minors of A is an invertible element of R. We also show that the group inverse of A when it exists is a polynomial in A with coefficients from R.

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U2 - 10.1016/0024-3795(91)90018-R

DO - 10.1016/0024-3795(91)90018-R

M3 - Article

AN - SCOPUS:0039429209

SN - 0024-3795

VL - 146

SP - 31

EP - 47

JO - Linear Algebra and Its Applications

JF - Linear Algebra and Its Applications

IS - C

ER -