Ex: J dz/z(z-2)^4
(2 isolated singular pr)
J f(z) dz = 2πi Res f = 2πi bi
(c) fI is analytic on Laurent series at 2: O < I z-2I < R2 =2
[infinity]Σn=0 an (z-zo) + [infinity]Σn=1 bn/(z-zo)^n = 1/z(z-2)^4