
Does this equality hold? I think it is connected to Hankel’s contour integral in which the direction of the contour is slightly deformed.
The exp(ib) means infinity in the direction of exp(ib) on the complex plane.

Does this equality hold? I think it is connected to Hankel’s contour integral in which the direction of the contour is slightly deformed.
The exp(ib) means infinity in the direction of exp(ib) on the complex plane.
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