Sequences of Levy transformations for the Darboux system of conjugates nets in multidimensions are studied. We show that after a suitable number of Levy transformations, with at least a Levy transformation in each direction, we get closed formulae in terms of multi-Wronski determinants. These formulae are for the tangent vectors, Lame coefficients, rotation coefficients and points of the surface.

We consider the Miura map between the lattice Kadomtsev–Petviashvili hierarchy and the lattice modified KP hierarchy and prove that the map is canonical not only between the first Hamiltonian structures, but also between the second Hamiltonian structures. © 2001 American Institute of Physics. [DOI: 10.1063/1.1359416]

The Hamiltonian theory for the two-component AKNS hierarchy and Yajima–Oikawa hierarchy is considered from the viewpoint of reduction. We show that the second Hamiltonian structures of the former is a Dirac reduction of the sl (3) current algebra, while the latter is related to the classical W4 ~3! algebra. © 1996 American Institute of Physics. [S0022-2488(96)01905-8]

A proper bilinear form is proposed for the N=1 supersymmetric modified Korteweg–de Vries equation. The bilinear Backlund transformation for this system is constructed. As applications, some solutions are presented for it.

A multicomponent KdV system, Kupershmidt’s coupled KdV equation, is considered. The system is shown to be a modification of some system, and it can be modified.