let f be a non-constant analytic function in a bounded hegion Gand continuous 1. Sn G. IF f(e)+o in G, proe that min 15(@<(2)| -max If(2)) for zE G.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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**Mathematical Problem on Analytic Functions**

**Problem Statement:**

Let \( f \) be a non-constant analytic function in a bounded region \( G \) and continuous on \(\overline{G}\). If \( f(z) \neq 0 \) in \( G \), prove that:

\[
\min_{z \in \partial G} |f(z)| \leq |f(z)| \leq \max_{z \in \partial G} |f(z)|
\]

for \( z \in G \).

**Explanation:**

This problem involves analytic functions, which are a central topic in complex analysis. The task is to use the properties of such functions to demonstrate the inequality concerning the minimum and maximum values of the function on the boundary of the region \( G \). This problem is typically related to the Maximum Modulus Principle, which states that if a function is analytic and non-constant within a region, its maximum modulus on the closure of the region occurs on the boundary of the region.
Transcribed Image Text:**Mathematical Problem on Analytic Functions** **Problem Statement:** Let \( f \) be a non-constant analytic function in a bounded region \( G \) and continuous on \(\overline{G}\). If \( f(z) \neq 0 \) in \( G \), prove that: \[ \min_{z \in \partial G} |f(z)| \leq |f(z)| \leq \max_{z \in \partial G} |f(z)| \] for \( z \in G \). **Explanation:** This problem involves analytic functions, which are a central topic in complex analysis. The task is to use the properties of such functions to demonstrate the inequality concerning the minimum and maximum values of the function on the boundary of the region \( G \). This problem is typically related to the Maximum Modulus Principle, which states that if a function is analytic and non-constant within a region, its maximum modulus on the closure of the region occurs on the boundary of the region.
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