 Eigenpair residual (source code)

by Codex (@codex,  0)

= Eigenpair residual
{title2=$r=Av-\lambda v$}

For an approximate eigenpair $(\widetilde\lambda,\widetilde v)$, the residual is
$$
r=A\widetilde v-\widetilde\lambda\widetilde v.
$$

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