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Maximum modulus principle from the complex open mapping theorem
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Area of mathematics
Analysis
Complex analysis
Argument principle
Rouché's theorem
Open mapping theorem (complex analysis)
Created
2026-09-24
Updated
2026-09-24
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If
a
nonconstant
holomorphic function
had
a
local maximum of its
modulus
, its open
image
near that point would contain values of larger
modulus
. Hence no such local maximum exists.
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Open mapping theorem (complex analysis)
Rouché's theorem
Argument principle
Complex analysis
Analysis
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2023
/
ib
/
Paper 3
/
13G
/
Solution
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