Abstract
Various results known for one-dimensional periodic Toda lattice equations are generalised to two dimensions. In particular, a generalisation of the Kac-van Moerbeke equations is derived from a set of first-order differential equations of which the zero gauge field strength is an integrability condition. The generalised equations are shown to be the unification of two different periodic Toda lattice equations and they naturally produce the Backlund transformation. The two lattice equations are simultaneously derived from a pair of 2(n+1)*2(n+1) potentials satisfying the zero field strength condition.
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