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PDF Availablehttps://doi.org/10.1016/j.crma.2014.05.009
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Cite Journal: Comptes Rendus. Mathématique |  Publication Date: Jun 19, 2014 |
 Citations: 9 |  License type: mit |
We prove that the derivative θ′ of an inner function θ is outer if and only if θ is a Möbius transformation. An alternative characterization involving a reverse Schwarz–Pick type estimate is also given.
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