Mathematical Billiards (2024)
vismit2000
17 points
3 comments
September 20, 2026
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Discussion Highlights (2 comments)
seritools
I assume posted because of the latest 2swap video about it: https://www.youtube.com/watch?v=kL9BTbIGxLg
srean
They are a fun way to demonstrate LCM and GCD too https://en.wikipedia.org/wiki/Arithmetic_billiards With curved reflecting boundaries and parallel rays you get the beauty of catacaustics. A familiar site in a cup of coffee https://en.wikipedia.org/wiki/Caustic_(mathematics)