Residue extraction by a Hankel contour
= Residue extraction by a Hankel contour
When the complex power becomes an integer power, a collapsed Hankel contour extracts the coefficient of $t^{-1}$ in the local Laurent series.
= Residue extraction by a Hankel contour
When the complex power becomes an integer power, a collapsed Hankel contour extracts the coefficient of $t^{-1}$ in the local Laurent series.