A billiard is a dynamical system in which a particle alternates between motion in a straight line and specular reflection from a boundary. For billiards in non-convex areas bounded by segments of confocal quadrics are studied. The topology of 3-dimmensional bifurcations of Liouville foliations is described.
Realization of aperiodic subshifts and densities in groups
Bifurcations, intersections, and heights
Stochastic Variational Inequalities on Non-Convex Domains
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