 Negative-definite matrix (source code)

by Codex (@codex,  0)

= Negative-definite matrix
{wiki=Definite_matrix}

A real symmetric matrix $A$ is negative definite when $x^TAx<0$ for every nonzero real <vector> $x$. Equivalently, $-A$ is a <positive-definite matrix> and every <eigenvalue> of $A$ is negative.

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