Answer to Question #2141 in Matrix | Tensor Analysis for Stasik

Question #2141
Suppose nxn martix A is non-negative (most entries are positive). Suppose M is an nxn projection matrix with rank m>0. How can I show (or derive a minimal condition for) that tr(AM) is strictly positive? Thanks!
1
Expert's answer
2011-07-01T18:35:16-0400
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