A process of extending the region in which a Complex Function is defined.

**References**

Arfken, G. *Mathematical Methods for Physicists, 3rd ed.* Orlando, FL: Academic Press, pp. 378-380, 1985.

Morse, P. M. and Feshbach, H. *Methods of Theoretical Physics, Part I.* New York: McGraw-Hill,
pp. 389-390 and 392-398, 1953.

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1999-05-25