On Discrete 3-Dimensional Equations Associated with the Local Yang-Baxter Relation

Details On Discrete 3-Dimensional Equations Associated with the Local Yang-Baxter Relation On Discrete 3-Dimensional Equations Associated with the Local Yang-Baxter Relation

1995-12-11

arxiv.org/abs/solv-int/9512005v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

10 pages, LaTeX, no figures

Scientific paper

10.1007/BF01815521

The local Yang-Baxter equation (YBE), introduced by Maillet and Nijhoff, is a proper generalization to 3 dimensions of the zero curvature relation. Recently, Korepanov has constructed an infinite set of integrable 3-dimensional lattice models, and has related them to solutions to the local YBE. The simplest Korepanov's model is related to the star-triangle relation in the Ising model. In this paper the corresponding discrete equation is derived. In the continuous limit it leads to a differential 3d equation, which is symmetric with respect to all permutations of the three coordinates. A similar analysis of the star-triangle transformation in electric networks leads to the discrete bilinear equation of Miwa, associated with the BKP hierarchy. Some related operator solutions to the tetrahedron equation are also constructed.

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