F depends only on |z| then f must be constant?

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SUMMARY

The discussion centers on the problem from a complex analysis course, specifically addressing the question: "Show that the only analytic functions f that depend on only |z| must be constant functions." The participant clarifies that f(z) is represented as g(|z|), indicating that the function is constant on each circle of radius r. This conclusion is rooted in the properties of analytic functions and their dependence on the modulus of z.

PREREQUISITES
  • Understanding of complex analysis principles
  • Familiarity with analytic functions
  • Knowledge of the modulus function |z|
  • Concept of functions being constant on circles in the complex plane
NEXT STEPS
  • Study the properties of analytic functions in complex analysis
  • Research the implications of functions being constant on circles
  • Learn about the Cauchy-Riemann equations and their role in determining analyticity
  • Explore examples of functions that depend on |z| and their characteristics
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Students of complex analysis, mathematicians exploring properties of analytic functions, and educators seeking to clarify concepts related to functions of complex variables.

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Homework Statement


Hi!
I am stuck on an exercise in the complex analysis course. The problem is:
"Show that the only analytic functions f that depends on only |z| must be the constant functions."

Homework Equations


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The Attempt at a Solution


I am not sure if I undertand the question, is it f(z)=|z|, or maybe f(z)=g(|z|)?
 
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It's the lattet. Note this is equivalent to saying that f is constant on each circle of radius r
 
Thanks a lot!
I'll try to solve this now, I'll be back if I get stuck. ;)
 

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