= Hankel contour
{wiki=Hankel_contour}
The Hankel contour is a contour in the complex plane commonly used in the context of complex analysis, particularly in the study of integral transforms and asymptotic analysis. It is especially useful for evaluating integrals of functions that have branch cuts or singularities. \#\#\# Basic Definition: The Hankel contour typically consists of two parts: 1. A large semicircular arc in the upper half-plane (or lower half-plane depending on the application) that joins two points along the real line.
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