Abstract
In this paper we consider billiards in a square with a barrier. We use Ratner's theorem to compute the asymptotics for the number of closed orbits.
Citation
Alex Eskin. Howard Masur. Martin Schmoll. "Billiards in rectangles with barriers." Duke Math. J. 118 (3) 427 - 463, 15 June 2003. https://doi.org/10.1215/S0012-7094-03-11832-3
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