Residue
Residue[expr,{z,z0}]
finds the residue of expr at the point z=z0.
Examples
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Wolfram Research (1991), Residue, Wolfram Language function, https://reference.wolfram.com/language/ref/Residue.html.
Text
Wolfram Research (1991), Residue, Wolfram Language function, https://reference.wolfram.com/language/ref/Residue.html.
CMS
Wolfram Language. 1991. "Residue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Residue.html.
APA
Wolfram Language. (1991). Residue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Residue.html