The contour illustrated above.
Hankel Contour
See also
Contour, Contour Integral, Hankel FunctionExplore with Wolfram|Alpha
References
Krantz, S. G. "The Hankel Contour and Hankel Functions." §13.2.4 in Handbook of Complex Variables. Boston, MA: Birkhäuser, p. 159, 1999.Referenced on Wolfram|Alpha
Hankel ContourCite this as:
Weisstein, Eric W. "Hankel Contour." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HankelContour.html