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When I reading Complex Analysis written by Elias M. Stein. In Chapter 2, he had introduced a notion "toy contour "without explaining. what does this exactly mean?

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There is an informal definition on page 40 and some example are given on page 42. – lhf Jan 21 '13 at 10:23

Taken from page 40 of the book,

Stein pg 40

Although presented somewhat unrigorously, toy contours are essentially always clear in use.

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