We present numerical evidence which strongly suggests that irrational triangular billiards (all angles irrational with $\pi$) are mixing. Since these systems are known to have zero Kolmogorov-Sinai entropy, they may play an important role in understanding the statistical relaxation process.

• Received 24 June 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4729