: Mathématiques: Schwarz lemma

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Schwarz lemma

In mathematics, the Schwarz lemma, named after Hermann Amandus Schwarz, is a result in complex analysis about holomorphic functions from the open unit disk to itself. The lemma is less celebrated than deeper theorems, such as the Riemann mapping theorem, which it helps to prove. It is, however, one of the simplest results capturing the rigidity of holomorphic functions.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Schwarz_lemma)

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