All acute triangles "with angles all less than 100 degrees contains at least one periodic billiard path — a repeating path that a ball will trace and retrace forever." - Richard Schwartz.
Are there any closed system or arrangments such that once you set a ball in motion, then through domino effect, they keep in circulation forever? Looking for infinite pool .. thought about it after reading this article on Sep 27, 2020.
New shapes solve infinite pool table problem
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