Metric characterizations of hyperbolic and Euclidean spaces
J. E. Valentine, S. G. Wayment (1972)
Colloquium Mathematicae
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J. E. Valentine, S. G. Wayment (1972)
Colloquium Mathematicae
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J. Aramayona (2006)
Disertaciones Matemáticas del Seminario de Matemáticas Fundamentales
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Yamashita, Shinji (1994)
Annales Academiae Scientiarum Fennicae. Series A I. Mathematica
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Oona Rainio, Matti Vuorinen (2023)
Czechoslovak Mathematical Journal
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The Möbius metric is studied in the cases, where its domain is an open sector of the complex plane. We introduce upper and lower bounds for this metric in terms of the hyperbolic metric and the angle of the sector, and then use these results to find bounds for the distortion of the Möbius metric under quasiregular mappings defined in sector domains. Furthermore, we numerically study the Möbius metric and its connection to the hyperbolic metric in polygon domains.
Mochizuki, Shinichi (1998)
Documenta Mathematica
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Mineyev, Igor (2005)
Geometry & Topology
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Michael Kapovich, Bruce Kleiner (2000)
Annales scientifiques de l'École Normale Supérieure
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Christophe Kapoudjian (1999)
Annales de l'institut Fourier
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Denote by , , the regular tree whose vertices have valence , its boundary. Yu. A. Neretin has proposed a group of transformations of , thought of as a combinatorial analogue of the diffeomorphism group of the circle. We show that is generated by two groups: the group of tree automorphisms, and a Higman-Thompson group . We prove the simplicity of and of a family of its subgroups.