由Weiss,Tabor和Carnevale(WTC)提出的Painlevé分析法是目前最有效且应用广泛的直接判别非线性偏微分方程的方法之一.借助符号计算软件Maple,首先将判断非线性系统可积性的WTC方法应用于(2+1)维Lax-Kadomtsev-Patviashvili(Lax-KP)方程中,通过领头项分析得到两种情况.然后分别寻找共振点,并验证共振条件是否成立,判别了(2+1)维Lax-KP方程具有Painlevé不可积性.应用Painlevé标准截断展开和非标准截断展开两种方法,构造了Lax-KP方程不同形式的精确解,通过适当选取常数值发现这些精确解都是扭结形状的孤波解.
The Painleve analysis method developed by Weiss, Tabor and Carnevale is one of the most effective and extensively used methods to test the integrability of the nonlinear partial differential equation. With the help of symbolic computation system Maple, the (2 + 1)-dimensional Lax-Kadomtsev-Patviashvili (Lax-KP) equation was proved to be Painleve non-integrable by using the Weiss,Tabor and Carnelvale (WTC) method. The leading order analysis helps one to find two cases and verify that the recursion relations are established directly. New exact solutions of the (2 + 1)-dimensional Lax-KP equation were obtained by the standard and nonstandard truncation expansions respectively, and all the solutions are both kink solitary solutions when selecting proper constants.