Let f(z) be an entire function satisfying |ƒ (²1 +22)| ≤ |ƒ (2₁)| + + + |ƒ (2₂) | = n for all 2₁, 22 € C and some integer n > 0. Show that f(z) is a polynomial in z of degree at most n.
Let f(z) be an entire function satisfying |ƒ (²1 +22)| ≤ |ƒ (2₁)| + + + |ƒ (2₂) | = n for all 2₁, 22 € C and some integer n > 0. Show that f(z) is a polynomial in z of degree at most n.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Let f(z) be an entire function satisfying
|f (21 + z2)|† < |f (21)|* + \f (22)|*
for all 21, 22 E C and some integer n > 0. Show that f(2) is a polynomial in z
of degree at most n.
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