A couple of applications of Baecklund transformations in the study of nonlinear evolution equations is here given. Specifically, we are concerned about third order nonlinear evolution equations. Our attention is focussed on one side, on proving a new invariance admitted by a third order nonlinear evolution equation and, on the other one, on the construction of solutions. Indeed, via B ̈acklund transformations, a Baecklund chart, connecting Abelian as well as non Abelian equations can be constructed. The importance of such a net of links is twofold since it indicates invariances as well as allows to construct solutions admitted by the nonlinear evolution equations it relates.
The present study refers to third-order nonlinear evolution equations of KdV type. On the basis of the Abelian wide Baecklund chart which connects various different third order nonlinear evolution equations an invariance admitted by the Korteweg-deVries interacting soliton (int.sol.KdV) equation is obtained and a related new explicit solution is constructed. Then, the corresponding non-Abelian Baecklund chart, shows how to construct matrix solutions of the mKdV equations: some recently obtained solutions are reconsidered
