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 Math Emeritus Sci Advisor Thanks PF Gold P: 39,556 ??? Why do the diagonal matrices $$\begin{bmatrix}1 & 0 \\ 0 & 2\end{bmatrix}$$ and $$\begin{bmatrix} 1 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 3\end{bmatrix}$$ NOT count as "all entries postive"?