Novel Wronskian Condition and New Exact Solutions to a （3＋1）-Dimensional Generalized KP Equation

Utilizing the Wronskian technique, a combined Wronskian condition is established for a （3＋1）-dimensional generalized KP equation. The generating functions for matrix entries satisfy a linear system of new partial differential equations. Moreover, as applications, examples of Wronskian determinant solutions, including N-soliton solutions, periodic solutions and rational solutions, are computed.     

Darboux Transformation of a Differential-Difference Equation and Its Explicit Solutions

The Darboux transformation of a differential-difference equation associated with a 3 × 3 matrix spectral problem is derived. As an application, explicit soliton solutions of the differential-difference equation are presented.     

New finite-gap solutions for the coupled Burgers equations engendered by the Neumann systems

On the tangent bundle TS^N-1 of the unit sphere S^N-1, this paper reduces the coupled Burgers equations to two Neumann systems by using the nonlinearization of the Lax pair, whose Liouville integrability is displayed in the scheme of the r-matrix technique. Based on the Lax matrix of the Neumann systems, the Abel--Jacobi coordinates are appropriately chosen to straighten out the restricted Neumann flows on the complex torus, from which the new finite-gap solutions expressed by Riemann theta functions for the coupled Burgers equations are given in view of the Jacobi inversion.     

On the linearization of the coupled Harry－Dym soliton hierarchy

This paper is devoted to the study of the underlying linearities of the coupled Harry--Dym (cHD) soliton hierarchy, including the well-known cHD equation. Resorting to the nonlinearization of Lax pairs, a family of finite-dimensional Hamiltonian systems associated with soliton equations are presented, constituting the decomposition of the cHD soliton hierarchy. After suitably introducing the Abel--Jacobi coordinates on a Riemann surface, the cHD soliton hierarchy can be ultimately reduced to linear superpositions, expressed by the Abel--Jacobi variables.     

混合Boussinesq 方程的有限亏格解

借助于Lenard 递推方程和定态零曲率方程, 我们给出与3 × 3 矩阵谱问题相联系的一族混合Boussinesq 方程. 利用Lax 矩阵的特征多项式, 引入一条三角曲线K_m-1, 由此构造出相应的Baker-Akhiezer 函数、亚纯函数和Dubrovin- 型方程. 混合Boussinesq 流在Abel 映射下被拉直. 基于三角曲线和三类Abel 微分的理论, 我们得到了Baker-Akhiezer 函数、亚纯函数的Riemann θ 函数表示, 特别地, 给出了混合Boussinesq 方程的有限亏格解.     

一个Bargmann系统与一个Neumann系统

本文引入一个特征值问题导出一类非线性演化方程,在位势与特征函数之间的两种不同的约束下,此特征值问题被非线性化为一个以为Hamiltonian函数的完全可积的Bargmann系统和一个以为Hamiltonian函数的完全可积的O.Neumann系统。     

Darboux Transformations to （2＋1）-Dimensional Lattice Systems

Two (2 1)-dimensional (3D) lattice systems are proposed in view of the compatibility of 2D lattice systems in the same hierarchy. Furthermore, the Darboux transformation (DT) method is generalized to the case of 3D lattice equations. As a consequence, some exact solutions for the resulting discrete systems are presented.     

二维Sawada—Kotera方程的Darboux变换

本文导出二维Sawada-Kotera方程的Darboux变换和B(?)cklund变换。作为一个特例,讨论了一维Sawada-Kotera方程并求出了两方程的孤子解。     

变形浅水波方程和广义Klein-Gordon方程

文献[1-2]中研究了浅水波方程 u_i-u_(?)-4uu_i-2u_zu_i+u_z=0 (0.1)的反散射方法求解,并给出了它的N孤子解、文献[3—5]中证明了Klein-Gordon方程 r_(?)=F(r) (0.2)具有Backlund变换,其中,函数F以r为变量。本文从特征值问题出发,导出变形浅水波方程等及几个广义Klein-Gordon方程的Lax对及其相联系的Darboux变换,并求得了它们的孤子解.