c n 1
ð Þ ¼
1
2πi
I
C
0
À1
ð Þ
n 1 À u
2
ð
Þ
n
2
n u À 1
ð
Þ
nþ1
du ¼
1
2
n Á
1
2πi
I
C
0
u þ 1
ð
Þ
n
u À 1
du ¼
1
2
n Á u þ 1
ð
Þ
n
u¼1
¼ 1
and
c n À1
ð Þ ¼
1
2πi
I
C
0
À1
ð Þ
n 1 À u
2
ð
Þ
n
2
n u þ 1
ð
Þ
nþ1
du ¼
1
2
n Á
1
2πi
I
C
0
u À 1
ð
Þ
n
u þ 1
du ¼
1
2
n Á u À 1
ð
Þ
n
u¼À1
¼ À1
ð Þ
n
ð6:279Þ
Notice that in (6.279) the integrand has a simple pole at u ¼ Æ 1 and, hence, we
used (6.144) and (6.148) with the contour integration. The contour C
0 is taken so that
it can encircle u ¼ 1 in the former case and u ¼ À 1 in the latter. Hence, we have
important relations
P n 1
ð Þ ¼ 1 and P n À1
ð Þ ¼ À1
ð Þ
n :
ð6:280Þ
Summarizing this chapter, we have explored the theory and applications of the
analytic functions on the complex domain. We have studied how the theory of
analytic functions produces fruitful results.
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