Keywords. Dual billiards, symplectic relation, periodic orbits, Morse and Lusternik-Schnirelman theory
AMS subject classification. Primary: 37J45, 70H12.
Submitted: 21 Febuary 2003. Accepted: 23 September 2003. Published: 5 October 2003.
Department of Mathematics
Pennsylvania State University
University Park, PA 16802, USA
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