partial fractions
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21: 2.4 Contour Integrals
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►However, if , then and different branches of some of the fractional powers of are used for the coefficients ; again see §2.3(iii).
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►Suppose that on the integration path there are two simple zeros of that coincide for a certain value of .
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►with and chosen so that the zeros of correspond to the zeros , say, of the quadratic .
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2.4.20
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