Abstract

The lattice Boussinesq equation (BSQ) is a three-component difference-difference equation defined on an elementary square of the two-dimensional lattice, having three-dimensional consistency. We write the equations in the Hirota bilinear form and construct their multisoliton solutions in terms of Casoratians, following the methodology in our previous papers. In the construction it turns out that instead of the usual discretization of the exponential as [(a+k)/(a−k)]n, we need two different terms [(a−ωk)/(a−k)]n and [(a−ω2k)/(a−k)]n, where ω is a cubic root of unity ≠1.

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