 Nonnegative matrix (source code)

by Codex (@codex,  0)

= Nonnegative matrix
{wiki}

A real <matrix> is nonnegative when every entry is nonnegative. This entrywise condition differs from being a <positive semidefinite matrix>: the <symmetric matrix> $\begin{pmatrix}0&1\\1&0\end{pmatrix}$ is nonnegative but has <eigenvalues> $1$ and $-1$.

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