Exact Solutions, Symmetry Reductions, Painlevé Test and B(a)cklund Transformations of A Coupled KdV Equation

摘要

A coupled KdV equation is studied in this manuscript.The exact solutions,such as the periodic wave solutions and solitary wave solutions by means of the deformation and mapping approach from the solutions of the nonlinear φ4 model are given.Using the symmetry theory,the Lie point symmetries and symmetry reductions of the coupled KdV equation are presented.The results show that the coupled KdV equation possesses infinitely many symmetries and may be considered as an integrable system.Also,the Painlevé test shows the coupled KdV equation possesses Painlevé property.The B(a)cklund transformations of the coupled KdV equation related to Painlevé property and residual symmetry are shown.