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arXiv 2009.14766math.CV
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平面域上调和映射的单叶性与拟共形扩张的判别准则

Criteria for univalence and quasiconformal extension for harmonic mappings on planar domains

Iason Efraimidis

摘要:

如果$Ω$是$\overline{\mathbb C}$中的单连通区域,那么根据Ahlfors-Gehring定理,$Ω$是拟圆盘当且仅当存在一个充分条件,使得$Ω$中的全纯函数的单叶性与它们的Schwarzian导数的增长性有关。通过证明拟圆上的一个单叶性准则,我们将这一定理推广到调和映射。我们还证明了满足这一准则的映射允许$\overline{\mathbb C}$的同胚扩张,并且在$Ω$中的拟共形的附加假设下,它们允许$\overline{\mathbb C}$的拟共形扩张. Ahlfors-Gehring定理已经由Osgood,Beardon和Gehring推广到半连通域$Ω$,他们证明了在$Ω$中存在一个Schwarzian的单叶性准则当且仅当$\partialΩ$的分支是点或拟圆。我们把这个定理推广到调和映射。

英文摘要:

If $Ω$ is a simply connected domain in $\overline{\mathbb C}$ then, according to the Ahlfors-Gehring theorem, $Ω$ is a quasidisk if and only if there exists a sufficient condition for the univalence of holomorphic functions in $Ω$ in relation to the growth of their Schwarzian derivative. We extend this theorem to harmonic mappings by proving a univalence criterion on quasidisks. We also show that the mappings satisfying this criterion admit a homeomorphic extension to $\overline{\mathbb C}$ and, under the additional assumption of quasiconformality in $Ω$, they admit a quasiconformal extension to $\overline{\mathbb C}$. The Ahlfors-Gehring theorem has been extended to finitely connected domains $Ω$ by Osgood, Beardon and Gehring, who showed that a Schwarzian criterion for univalence holds in $Ω$ if and only if the components of $\partialΩ$ are either points or quasicircles. We generalize this theorem to harmonic mappings.

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