Abstract
We prove a recent theorem by C. Culter every polygonal outer billiard in the affine plane has a periodic trajectory.
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Tabachnikov, S. A proof of Culter’s theorem on the existence of periodic orbits in polygonal outer billiards. Geom Dedicata 129, 83–87 (2007). https://doi.org/10.1007/s10711-007-9196-y
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DOI: https://doi.org/10.1007/s10711-007-9196-y