We prove that for a given oval C there exist ovals Cin and Cout, inside and outside of C, such that the pairs (C,Cin) and (Cout,C) satisfy the Poncelet's porism for almost any number of reflections in their bar billiards.
Cite this article
Witold Mozgawa, Bar Billiards and Poncelet's Porism. Rend. Sem. Mat. Univ. Padova 120 (2008), pp. 157–166DOI 10.4171/RSMUP/120-10