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Sat Jan 23 21:40:56 EST 2016

Biliart ball chaos

See [1].  Chaos is possible if the triangle (polygon?) does not tile
the plane (or tiles the plane chaotically?).

The geometry generated by a non-tesselating polygon is "piece-wize
curved".  What's a proper term for that?

Some other related [2][3].

[1] https://www.youtube.com/watch?v=3ajr5Fb2i1g
[2] https://plus.maths.org/content/chaos-billiard-table
[3] https://en.wikipedia.org/wiki/Ergodicity



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