Marcello Seri on Nostr: And if you want to know some of the #mathematics behind this, there are two great ...

And if you want to know some of the #mathematics behind this, there are two great text by Sergei Tabachnikov openly accessible on the web:

* Geometry and Billiards at https://web.archive.org/web/20051211063150/http://www.math.psu.edu/tabachni/Books/billiardsgeometry.pdf

* Billiards: http://num.math.uni-goettingen.de/~summer/tabachnikov_billiardsbook.pdf