Scarcity of periodic orbits in outer billiards
classification
🧮 math.DS
keywords
orbitsboundaryouterperiodbilliardbilliardsconvexcorners
read the original abstract
We give a simple proof of our previous result with V. Zharnitsky that the set of period 4 orbits in planar outer billiard with piecewise smooth convex boundary has empty interior, provided that no four corners of the boundary form a parallelogram. We also obtain results on period 5 and 6 orbits.
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