摘要
With the help of an improved mapping approach and a linear-variable-separation approach, a new family of exact solutions with arbitrary functions of the （2＋1）-dimensional Nizhnik-Novikov-Veselov system （NNV） is derived. Based on the derived solutions and using some multi-valued functions, we find a few new folded solitary wave excitations for the （2＋1）-dimensional NNV system.
基金
supported by the Natural Science Foundation of Zhejiang Province under Grant No.Y604106
the Scientific Research Foundation of Zhejiang Provincial Education Department under Grant No.20070568
the Natural Science Foundation of Zhejiang Lishui University under Grant No.KZ08001
