Hyperbolic billiards. Elastic collisions with clumping. There are really only three balls - black, green, blue.pic.twitter.com/MtHJ0ApRiQ
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Replying to @peterliepa
Three balls but up to a group of hyperbolic reflections (SL(2,Z) ??)
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Replying to @RogierBrussee
Yes, even number of reflections in the (2,3,8) triangle group.
9:55 PM - 6 Jun 2019
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