Let a function f be analytic everywhere in a domain D. Prove that if f (z) is

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Let a function f be analytic everywhere in a domain D. Prove that if f (z) is realvalued for all z in D, then f (z) must be constant throughtout D.
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Complex Variables and Applications

ISBN: 978-0073051949

8th edition

Authors: James Brown, Ruel Churchill

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