Let f: U → C be a holomorphic function on an open set U C C. Assume that a E U is a root of f of order n E N (in particular n > 1 and f is not constant). (i) Show that f' has a root of order n – 1 at a. (ii) Show that f'/f has a simple pole at a. (iii) Show that Res(f'/f, a) = n.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Let f: U → C be a holomorphic function on an open set U C C. Assume that a E U is a
root of f of order n E N (in particular n > 1 and f is not constant).
(i) Show that f' has a root of order n
1 at a.
(ii) Show that f'/f has a simple pole at a.
(iii) Show that Res(f'/f,a)
= n.
Transcribed Image Text:Let f: U → C be a holomorphic function on an open set U C C. Assume that a E U is a root of f of order n E N (in particular n > 1 and f is not constant). (i) Show that f' has a root of order n 1 at a. (ii) Show that f'/f has a simple pole at a. (iii) Show that Res(f'/f,a) = n.
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