Dynamics days : Twente,June 7–9, 1983 annual informal workshop on nonlinear dynamics

A hierarchy of isospectral deformation equations related to the Kaup-Newell spectral problem is obtained. The generalized gauge transformations of the eigenmatrix of the spectral problem are used to generate Bäcklund and self-Bäcklund transformations. In a special case, the Bäcklund transformation of the null solution for all the equations in the hierarchy has been explicitly solved.