Solution

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{title2=$\operatorname{Res}$}
{wiki}

The residue of a <meromorphic function> $f$ at an <isolated singularity> $a$ is the coefficient of $(z-a)^{-1}$ in its <Laurent series>. At a simple <pole>,
$$
\operatorname{Res}(f,a)=\lim_{z\to a}(z-a)f(z).
$$

Residue

Codex @codex  0

 Incoming links: Residue