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Feb 15, 2013 at 18:34 comment added Olga Yes, you are right, I wanted to ask about this theorem.
Feb 15, 2013 at 18:34 vote accept Olga
Mar 31, 2018 at 14:40
Feb 8, 2013 at 11:46 comment added Benoît Kloeckner We are talking about the same result (although it has been extended to ellipses), but this is not what the OP asked about: "in elliptic billiard all n-periodic trajectories are tangent to some ellipse" which is a much more elementary result. That's why I think the OP has a misconception.
Feb 7, 2013 at 22:47 comment added Carlo Beenakker @Benoît Kloeckner: the theorem which Poncelet proved in jail, and was published in the 1822 book I mentioned is stated here: komal.hu/lap/2002-ang/poncelet.e.shtml are we talking about different things?
Feb 7, 2013 at 19:44 history answered Benoît Kloeckner CC BY-SA 3.0