Maximum Modulus Principle

In mathematics, the maximum modulus principle in complex analysis states that if f is a holomorphic function, then the modulus cannot exhibit a true local maximum that is properly within the domain of f.

In other words, either f is a constant function, or, for any point z0 inside the domain of f there exist other points arbitrarily close to z0 at which |f | takes larger values.

Read more about Maximum Modulus Principle:  Formal Statement, Sketch of The Proof, Physical Interpretation, Applications

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