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Borel–Carathéodory theorem : ウィキペディア英語版
Borel–Carathéodory theorem
In mathematics, the Borel–Carathéodory theorem in complex analysis shows that an analytic function may be bounded by its real part. It is an application of the maximum modulus principle. It is named for Émile Borel and Constantin Carathéodory.
== Statement of the theorem ==

Let a function f be analytic on a closed disc of radius ''R'' centered at the origin. Suppose that ''r'' < ''R''. Then, we have the following inequality:
: \|f\|_r \le \frac \sup_ \operatorname f(z) + \frac |f(0)|.
Here, the norm on the left-hand side denotes the maximum value of ''f'' in the closed disc:
: \|f\|_r = \max_ |f(z)| = \max_ |f(z)|
(where the last equality is due to the maximum modulus principle).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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