Classification of integrable discrete equations of octahedron type

Details Classification of integrable discrete equations of octahedron type Classification of integrable discrete equations of octahedron type

2010-11-15

arxiv.org/abs/1011.3527v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

53 pp., pdfLaTeX

Scientific paper

We use the consistency approach to classify discrete integrable 3D equations of the octahedron type. They are naturally treated on the root lattice $Q(A_3)$ and are consistent on the multidimensional lattice $Q(A_N)$. Our list includes the most prominent representatives of this class, the discrete KP equation and its Schwarzian (multi-ratio) version, as well as three further equations. The combinatorics and geometry of the octahedron type equations are explained. In particular, the consistency on the 4-dimensional Delaunay cells has its origin in the classical Desargues theorem of projective geometry. The main technical tool used for the classification is the so called tripodal form of the octahedron type equations.

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