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arxiv: 1704.07944 · v1 · pith:UD2WPR6Bnew · submitted 2017-04-26 · 🧮 math.CV

Spherical convexity and hyperbolic metric

classification 🧮 math.CV
keywords omegahyperbolicmetricpartialconvexeuclideanlambdaspherical
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Let $\Omega$ be a domain in $\mathbb{C}$ with hyperbolic metric $\lambda_\Omega(z)|dz|$ of Gaussian curvature $-4.$ Mejia and Minda proved in their 1990 paper that $\Omega$ is (Euclidean) convex if and only if $d(z,\partial\Omega)\lambda_\Omega(z)\ge1/2$ for $z\in\Omega,$ where $d(z,\partial\Omega)$ denotes the Euclidean distance from $z$ to the boundary $\partial\Omega.$ In the present note, we will provide similar characterizations of spherically convex domains in terms of the spherical density of the hyperbolic metric.

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