Sankhya: The Indian Journal of Statistics

1994, Volume 56, Series A, Pt. 2 , pp. 347--357



ROBERT E. HARTWIG, University of Bradford

SUMMARY. Necessary and sufficient conditions are given for the block matrix perturbation $M=\left[\begin{array}{cc} A & C \\B & D \end{array} \right]$ and the rank-one perturbation x =A-cb*, of a square matrix A, to be EP.

AMS subject classification. 15A57,15A09.

Key words and phrases. EP matrices.

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