OP-00290 Open Ivrii's measure-zero conjecture for billiards DS · AIM Open Applied Problems · billiards · periodic orbits · Weyl's law
OP-00494 Open A periodic nonsingular billiard trajectory in every triangle DS · AIM Open Applied Problems · periodic orbits · polygonal billiards · triangles
OP-00528 Open Quadratic growth when a Hamiltonian map has infinitely many periodic orbits SG · AIM Open Applied Problems · Hamiltonian diffeomorphisms · periodic orbits