Assume that a function f is analytic in an annulus D centered at a point zo, that is D = { z € C; a < |z − zo|

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.1: Parabolas
Problem 40E
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Assume that a function f is analytic in an annulus D centered
at a point zo, that is
D = {z € C; a < |z − zo| < b},
where 0 < a <b ≤ ∞ and zo E C. Show that
=
S____ f(2) dz - ____ f(2) dz
|z-zol=r
whenever a < r < s < b and the circles |z − zol
|z - zol = s are positively oriented.
= r and
Transcribed Image Text:Assume that a function f is analytic in an annulus D centered at a point zo, that is D = {z € C; a < |z − zo| < b}, where 0 < a <b ≤ ∞ and zo E C. Show that = S____ f(2) dz - ____ f(2) dz |z-zol=r whenever a < r < s < b and the circles |z − zol |z - zol = s are positively oriented. = r and
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