关于推广的KdV方程的孤波解

修正了文献[5]中推广的KdV方程传播波解的形变理论,并提出了一个相关的代数方程有非零实根的充要条件,从而指出了文献[5]中的一个分析错误。最后直接从推广的KdV方程本身给出了由形变理论生成的孤波解的显式公式。 关键词：     

发展方程的时间依赖对称的Lie代数结构

发展方程的时间依赖对称的Ｌｉｅ代数结构马文秀（复旦大学数学研究所，上海２００４３３）ＴＨＥＬＩＥＡＬＧＥＢＲＡＳＴＲＵＣＴＵＲＥＳＯＦＴＩＭＥＤＥＰＥＮＤＥＮＴＳＹＭＭＥＴＲＩＥＳＯＦＥＶＯＬＵＴＩＯＮＥＱＵＡＴＩＯＮＳ￥ＭＡＷＥＮＸＩＵ（Ｉｎｓｔｉ...     

Persistent Homoclinic Orbits for Perturbed Nonlinear Schroding Equation With Derivative Term

In recent years there have been existence studies on the extensive of homoclinic orbits for mearly dissipative PDEs,which are chosely related to chaos.In this work,we consider the perturbe     

一族Liouville可积的有限维Hamilton系统

本文生成了一族Liouville可积的Hamilton相流彼此可交换的有限维Hamilton系统,并且给出了一串对合的显式公共运动积分及其一组对合的显式生成元.     

双约束孤立子流的可积形变

提出了基于Lax矩阵的构造双约束孤立子流的可积形变的新方法.作为应用,导出了双约束KdV流和双约束mKdV流的可积形变,并给出了这些形变的Lax表示、r-矩阵和守恒积分.     

关于无最小正周期的周期函数

本文研究了无最小正周期的周期函数的一般性质,给出了这种函数的一般构造方法,并讨论了许多特殊情形。由此,产生了各种形式的无最小正周期的周期函数。     

THE CONFOCAL INVOLUTIVE SYSTEM AND THE INTEGRABILITY OF THE NONLINEARIZED LAX SYSTEMS FOR AKNS HIERARCHY

The completely integrable Hamiltonian systems generated by the general confocal involutive system are proposed. It is proved that the nonlinearized eigenvalue problem for AKNS hierarchy is such an integrable system and showed that the time evolution equations for n≤3 obtained by nonlinearizing the time parts of Lax systems for AKNS hierarchy are Liouville integrable under the constraint of the spatial part.     

一些多项式型的有限维对合系

In this paper, starting from the combination of two in volutive systems, we consider separately some systems of polynomial functions:{I_m⁽¹⁾=B_m+R_m}_m=0^∞, {I_m⁽²⁾=B_m+S_m}_m=0^∞, {I_m⁽³⁾=B_m+T_m}_m=0^∞ and so on; and analyse carefully the sufft cient and necessary conditions of the involution of three systems of functions {I_m⁽ⁱ⁾}_m=0^∞(1≤i≤3) with general coefficients.Furthermore,we present concrete forms of the involutive systems hidden in {I_m⁽ⁱ⁾}_m=0^∞(1≤i≤3);and thus obtain six kinds of nontrivial involutive systems of functions, which include a few involutive systems discussed inthe literature. Based upon these involutive systems, we can generate a lot of new finite-dimensional Hamiltonian systems which are completely integrable in the sense of Liouville.     

Grammian and Pfaffian solutions as well as Pfaffianization for a (3+1)-dimensional generalized shallow water equation

Based on the Grammian and Pfaffian derivative formulae, Grammian and Pfaffian solutions are obtained for a (3+1)-dimensional generalized shallow water equation in the Hirota bilinear form. Moreover, a Pfaffian extension is made for the equation by means of the Pfaffianization procedure, the Wronski-type and Gramm-type Pfaffian solutions of the resulting coupled system are presented.     

Explicit solitary-wave solutions to generalized Pochhammer-Chree equations

ｎｔｒｏｄｕｃｔｉｏｎＰｏｃｈｈａｍｍｅｒ＿Ｃｈｒｅｅｑｕａｔｉｏｎ（ＰＣｅｑｕａｔｉｏｎｉｎｓｈｏｒｔ）ｕｔ－ｕｔｘｘ－ｕｘｘ－１ｐ（ｕｐ）ｘｘ＝０,（１）ｉｓｕｓｅｄｔｏｄｅｓｃｒｉｂｅｔｈｅｐｒｏｐａｇａｔｉｏｎｏｆｌｏｎｇｉｔｕｄｉｎａｌｄｅ...