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Rigidity on horocycles and hypercycles

2024/05/27 by Lo, Cheikh, Sane, Abdoul Karim · 1 citation
#FOS: Mathematics #Geometric Topology (math.GT)

paper · doi:10.48550/arxiv.2405.17598

Abstract

We show that a bijection f:ℍ2→ℍ2 of the hyperbolic plane that sends horocycles to horocycles (respectively hypercycles to hypercycles) is an isometry. This extends a previous result of J. Jeffers on geodesics to all curves with constant curvature in ℍ2. We go beyond by showing that every abstract automorphism of the geodesic graph (respectively horocycles and hypercycles graphs) is induced by an earthquake map (respectively an isometry) of ℍ2. This shadowed the difference between the geometry of geodesics and that of horocycles/hypercycles.

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