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Complex Analysis - Maths KU

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C<br />

z 0<br />

r<br />

Figure 6.6 Contour for Theorem 6.10<br />

z 0<br />

z<br />

R<br />

D<br />

C 1<br />

C 2<br />

Figure 6.7 C1 and C2 are concentric<br />

circles.<br />

− 1<br />

�<br />

�<br />

f(s) 1<br />

ds =<br />

2πi C1 s − z 2πi C1<br />

= 1<br />

�<br />

2πi C1<br />

6.3 Laurent Series 327<br />

Theorem 6.10 Laurent’s Theorem<br />

Let f be analytic within the annular domain D defined by<br />

r

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