A modified Suris hierarchy and N-fold Darboux -Bäcklund transformation

Abstract

A modified Suris hierarchy is derived by discrete zero curvature equation. Bi-Hamiltonian structure of the whole hierarchy is established through the discrete trace identity. And we prove that the obtained hierarchy is Liouville integrable. Then a one-fold Darboux- Bäcklund transformation for the modified Suris system is established by means of a proper gauge transformation matrix. As application, an explicit solution is given. Finally, as a result of the N times one-fold Darboux–Bäcklund transformation, we derive N -fold Darboux–Bäcklund transformation.