Abstract.
The inner radius of univalence of a domain D with Poincaré density ρ D is the possible largest number σ such that the condition ∥ S f ∥ D = sup w∈ D ρ D (w) −2∥ S f (z) ∥ ≤ σ implies univalence of f for a nonconstant meromorphic function f on D, where S f is the Schwarzian derivative of f. In this note, we give a lower bound of the inner radius of univalence for strongly starlike domains of order α in terms of the order α.
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The author was partially supported by the Ministry of Education, Grant-in-Aid for Encouragement of Young Scientists, 11740088. A part of this work was carried out during his visit to the University of Helsinki under the exchange programme of scientists between the Academy of Finland and the JSPS.
Received November 26, 2001; in revised form September 24, 2002 Published online May 9, 2003
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Sugawa, T. Inner Radius of Univalence for a Strongly Starlike Domain. Monatsh. Math. 139, 61–68 (2003). https://doi.org/10.1007/s00605-002-0541-9
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DOI: https://doi.org/10.1007/s00605-002-0541-9