Our instructor said if f is analytic on the punctured complex plane (missing origin), then $$a_{-1}=\oint_{|z|=r} f(z) dz$$ This may be an obvious question, but what happened to the $\frac{1}{2\pi i}$ term before the integral?
2026-03-28 08:28:01.1774686481
$a_{-1}$ term of a function on the punctured plane?
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That is a mistake. Good job for noticing it!