Addendum to "On triangular Billard"

Abstract

Let $n,s,t$ be integers satisfying $(n,s,t)=1$. We classify all cases such that there is no integer $a$ with $n/2<as\mathrm{mod}n+at\mathrm{mod}n<3n/2$. This closes a gap in previous work of the author (Comment Math. Helv. 76, 501--505).

arXiv commentpreliminary version