One of our user asked:
A real matrix $B$ is called non-negative if every entry is non-negative. We will denote this by $B\ge 0$.
I want to find a non-negative matrix $B$ satisfying the following two conditions:
(1) $(I-B)^{-1}$ exists but not non-negative. Here $I$ is the identity matrix.
(2) There is a non-zero and non-negative vector $\vec{d}$ such that $(I-B)^{-1}\vec{d}\ge 0$.
I tried all the $2\times 2$ matrices, but it did not work. I conjecture that such a $B$ does not exist, but don't know how to prove it.
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