Let f be analytic and let f'(z) ‡0 on an open region N, and let zo EN such that f(zo) # 0. Prove that given € > 0 there exist 21, 22 EN such that 21 -20 < €, |22-20 < € and |ƒ(21)| > |ƒ(zo), f(22)|

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 25E: 25. Let, where and are non empty, and let and be subsets of . Prove that. Prove that. Prove...
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Let f be analytic and let f'(z) ‡ 0 on an open region N, and let zo E N
such that f(zo) ‡ 0. Prove that given € > 0 there exist 21, 22 € N such that
|21 — 20 < €,
22-20 < €
and
|ƒ(21)| > |ƒ(20)|, |ƒ(22)|<|ƒ(20)|.
Transcribed Image Text:Let f be analytic and let f'(z) ‡ 0 on an open region N, and let zo E N such that f(zo) ‡ 0. Prove that given € > 0 there exist 21, 22 € N such that |21 — 20 < €, 22-20 < € and |ƒ(21)| > |ƒ(20)|, |ƒ(22)|<|ƒ(20)|.
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