Abstract
If a square matrix has a nonnegarive power it is called a property-n matrix. In a recent paper [12] Werner derived some interesting necessary and sufficient conditions for a property n property-n matrix to be Drazin-montone. In particular, it was shown that a property -n matrix with ind(A) = k is Drazin-monotone if and only if A 2k+1 is weak-r-monotone. Our principal aim here is to show how this result can he strengthened considerably. To tackle this problem we also present several further results on the structure of Drazin-monotone (property-n) matrices.

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