Periodic Orbits of Billiards on an Equilateral Triangle

Details Periodic Orbits of Billiards on an Equilateral Triangle Periodic Orbits of Billiards on an Equilateral Triangle

2005-09-13

arxiv.org/abs/math/0509292v7

Mathematics

Dynamical Systems

Version 7: Minor edits made, some figures redrawn, Table 1 moved from appendix to body of text.

Scientific paper

We give a complete solution of the following problem: Find, classify and count the (classes of) periodic orbits on an equilateral triangle. We prove that Fagnano's period 3 orbit is the only periodic orbit with odd period. A periodic orbit is either prime or some d-fold iterate thereof. We count prime and iterate periodic orbits of period $2n$ via a bijection with a certain partition of $n$, then count only prime orbits using the prime factorization of $n$.

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