Finiteness in polygonal billiards on hyperbolic plane
DOI:
https://doi.org/10.12775/TMNA.2021.003Keywords
Hyperbolic plane, polygonal billiards, pointed geodesics, subshifts of finite type, Hausdorff metric, space of all subshiftsAbstract
J. Hadamard studied the geometric properties of geodesic flows on surfaces of negative curvature, thus initiating ``Symbolic Dynamics". In this article, we follow the same geometric approach to study the geodesic trajectories of billiards in ``rational polygons'' on the hyperbolic plane. We particularly show that the billiard dynamics resulting thus are just `Subshifts of Finite Type' or their dense subsets. We further show that `Subshifts of Finite Type' play a central role in subshift dynamics and while discussing the topological structure of the space of all subshifts, we demonstrate that they approximate any shift dynamics.References
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