Abstract
AbstractThis article concerns a class of open billiards consisting of a finite number of strictly convex, non-eclipsing obstacles K. The non-wandering set M0 of the billiard ball map is a topological Cantor set, and its Hausdorff dimension has been previously estimated for billiards in ℝ2 using well-known techniques. We extend these estimates to billiards in ℝn and make various refinements to the estimates. These refinements also allow improvements to other results. We also show that in many cases, the nonwandering set is confined to a particular subset of ℝn formed by the convex hull of points determined by period 2 orbits. This allows more accurate bounds on the constants used in estimating Hausdorff dimension.
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