On configuration spaces of plane polygons, sub-Riemannian geometry and periodic orbits of outer billiards
D. Genin, S. Tabachnikov
Abstract
Following a recent paper by Baryshnikov and Zharnitskii, we consider outer billiards in the plane possessing invariant curves consisting of periodic orbits. We prove the existence and abundance of such tables using tools from sub-Riemannian geometry. We also prove that the set of 3-periodic outer billiard orbits has zero measure.
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