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ON SIMILARITY INVARIANTS OF EP MATRICES
Rajian, C.,Chelvam, T. Tamizh The Youngnam Mathematical Society Korea 2007 East Asian mathematical journal Vol.23 No.2
We describe the class of invertible matrices T such that $TAT^{-1}$ is EPr, for a given EPr matrix A of order n. Necessary and sufficient condition is determined for $TAT^{-1}$ to be EP for an arbitrary matrix A of order n.