Hyperbolic billiards. A close-up.pic.twitter.com/LdeIc9d6b8
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Three balls but up to a group of hyperbolic reflections (SL(2,Z) ??)
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Yes, even number of reflections in the (2,3,8) triangle group.
End of conversation
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