In mathematics, a Hankel contour is a path in the complex plane which extends from [∞,δ], around the origin counter clockwise and back to [∞,−δ], where δ is an arbitrarily small positive number. The contour thus remains arbitrarily close to the real axis but without crossing the real axis except for negative values of x.
- Hugh L. Montgomery; Robert C. Vaughan (2007). Multiplicative number theory I. Classical theory. Cambridge tracts in advanced mathematics 97. p. 515. ISBN 0-521-84903-9.
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