Billiard algebra, integrable line congruences, and double reflection nets

Details Billiard algebra, integrable line congruences, and double reflection nets Billiard algebra, integrable line congruences, and double reflection nets

2011-12-26

arxiv.org/abs/1112.5860v2

Nonlinear Sciences

Exactly Solvable and Integrable Systems

18 pages, 8 figures

Scientific paper

The billiard systems within quadrics, playing the role of discrete analogues of geodesics on ellipsoids, are incorporated into the theory of integrable quad-graphs. An initial observation is that the Six-pointed star theorem, as the operational consistency for the billiard algebra, is equivalent to an integrabilty condition of a line congruence. A new notion of the double-reflection nets as a subclass of dual Darboux nets associated with pencils of quadrics is introduced, basic properies and several examples are presented. Corresponding Yang-Baxter maps, associated with pencils of quadrics are defined and discussed.

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