Periodic billiard paths in right triangles are unstable
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- Hooper, W.P. Geom Dedicata (2007) 125: 39. doi:10.1007/s10711-007-9129-9
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A stable periodic billiard path in a triangle is a billiard path which persists under small perturbations of the triangle. This article gives a geometric proof that no right triangles have stable periodic billiard paths.