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A characterization of Möbius transformations
Authors:Roland Hö  fer
Institution:Mathematisches Seminar, Universität Hamburg, Bundesstr. 55, 20146 Hamburg, Germany
Abstract:Let $n\ge 2$ be an integer and let $\mathcal{D}$ be a domain of $\mathbb{R}^n$. Let $f:\mathcal{D}\to\mathbb{R}^n$ be an injective mapping which takes hyperspheres whose interior is contained in $\mathcal{D}$ to hyperspheres in $\mathbb{R}^n$. Then $f$ is the restriction of a Möbius transformation.

Keywords:M{\"o}bius transformation  Lie transformation  mappings preserving hyperspheres  Alexandrov's theorem for domains
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