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THE BOUSSINESQ INTEGRABLE SYSTEM: COMPATIBLE LATTICE AND CONTINUUM STRUCTURES

2005; Cambridge University Press; Volume: 47; Issue: A Linguagem: Inglês

10.1017/s0017089505002417

1469-509X

Anastasios Tongas, Frank Nijhoff,

Algebraic structures and combinatorial models

We consider the discrete Boussinesq integrable system and the compatible set of differential difference, and partial differential equations.The latter not only encode the complete hierarchy of the Boussinesq equation, but also incorporate the hyperbolic Ernst equations for an Einstein-Maxwell-Weyl field in general relativity.We demonstrate a specific symmetry reduction of the partial differential equations, to a six-parameter, second order coupled system of ordinary differential equations, which is conjectured to be of Garnier type.