一个拓展的AKNS族及其3-Hamilton对偶(英文)

首先研究了基于Kac-Moody代数sl(2,C[λ~(-1),λ)获得一类新的谱问题.得到的谱问题可以视为AKNS谱问题的一个推广,由此可以引出耦合Burgers方程族.作为该方程族的可积特征得到了多Hamilton结构、无穷多对称和守恒律.耦合Burgers方程具有两个局部的Hamilton算子,基于此,给出3个相容的Hamilton算子并且得到一个耦合Burgers方程的3-Hamilton对偶系统.此外,建立了一个联系所研究的谱问题与AKNS谱问题的规范变换,基于该变换还讨论了Burgers方程族与一个约化的AKNS方程族的关系.     

超广义Burgers方程族的非线性可积耦合及其Bargmann对称约束

基于李超代数,构造了超广义Burgers方程族的非线性可积耦合,并且利用超级恒等式得到了它的超Hamilton结构.此外,该文计算出超广义Burgers方程族的非线性可积耦合的Bargmann对称约束.     

一个经典的可积Neumann系统和Boussinesq族Lax对的非线性化

本文在位势与特征函数之间的Neumann约束条件下,经典Boussinesq族的Lax对被非线性化成为自然相容的Lax系统;而且,其为Liouville完全可积的Hamiltonian系统,同时获得了Boussinesq方程解的对合表示。     

应用指数函数法求解变系数耦合Burgers系统

本文应用指数函数法和吴方法,借助计算机代数系统Maple辅助符号计算,获得了变系数耦合Burgers系统由双曲函数表示的新的精确解.     

关于AKNS族和一个耦合的MKdV族的规范等价可积系统与r-矩阵

得到了一个新的耦合的MKdV族．通过规范变换，首次从AKNS族中得到耦合的MKdV族的Lax表示、可积系与约束流；利用Lax表示，构造了耦合MKdV族的约束流的γ-矩阵，同时也给出了该方程族约束流的第二组守恒积分与对合性．     

一族4×4AKNS方程的对合解

本文获得了一族ＡＫＮＳ方程及其Ｌａｘ表示．用文献［２］和［３］的方法证明了可以从两个方面相容的常微分方程组的相容解构造出４×４ＡＫＮＳ非线性偏微分方程的解。     

Jaulent-Miodek族产生的一个完全可积的有限维三次系统

本文研究Jaulent-Miodek族的对易表示,在无反射位势的特征函数表示:即 q=-〈ψ_2,ψ_2〉,r=(Aψ_2,ψ2); (q,r)~T≡f(ψ),ψ≡(ψ_1,ψ_2)~T所诱导的约束条件下,Jaulent-Miodek族的Lax对的空间部分被非线性化为一个完全可积系统(R~(2N),dψ_1∧dψ_2,H=(?)_0),其中(?)_0=i〈Aψ_1,ψ_2〉+1/2〈ψ_1,ψ_2〉〈Aψ_2,ψ_2〉.时间部分的非线性化导出它的N-对合系{(?)_m},相容方程组((?)_0),((?)_m)的对合解被f映为第m个Jaulent-Miodek方程的解。     

R^3中曲率线为球面曲线的曲面

用Ｅ．Ｃａｒｔａｎ的外微分系统理论，研究了Ｒ＾３中一族（或两族）曲率线为球面曲线的曲面的模空间。     

色散长波方程族的换位表示

本文据文［１］的思路，得到了色散长波方程族的换位表示，并讨论了驻定色散长波系统．     

两个高维loop代数及应用

借助于循环数,构造了维数分别是5(s+1)和4(s+1)的两个高维loop代数．为了计算方便,本文只考虑s=1时的应用．利用第一个loop代数■_1~*得到了具有4-Hamilton结构的一个广义AKNS族,该方程族可约化为著名的AKNS族．利用第二个loop代数■_2~*,得到了具有4个分量位势函数的4-Hamilton结构方程族,该族可约化为一个非线性耦合Burgers方程和一个耦合的KdV方程．     

C. Neumann System Associated with the Levi Hierarchy

51.Intr0ductionUsuallyasolitonequationcanbeexpressedasthecompatibleconditionofanover-determinedsystem,theso-calledLaxpair-Wehavea1readyknownthatthetwol1nearequationsintheLaxpaircanben0nlinearizedtobetw0c0mpatible,comp1etelyintegrableHamilt0niansystemsintheLioll"i1lesenseundersomecertainc0nstraintconditionsbetweentheeigenfunctionsandthepotentials(seeL1J).Am0ngtheseconstraintconditionsaretheretheBargmannconstraint{see[1,2,4j),theC.Neumannconstraint(see[l,4J),andthesymmetryconstra1nt(see[5,6j…     

Burgers and Kadomtsev-Petviashvili hierarchies: A functional representation approach

Functional representations of (matrix) Burgers and potential Kadomtsev-Petviashvili (pKP) hierarchies (and others), as well as some corresponding Bäcklund transformations, can be obtained surprisingly simply from a “discrete” functional zero-curvature equation. We use these representations to show that any solution of a Burgers hierarchy is also a solution of the pKP hierarchy. Moreover, the pKP hierarchy can be expressed in the form of an inhomogeneous Burgers hierarchy. In particular, this leads to an extension of the Cole-Hopf transformation to the pKP hierarchy. Furthermore, these hierarchies are solved by the solutions of certain functional Riccati equations.     

Differential-algebraic approach to constructing representations of commuting differentiations in functional spaces and its application to nonlinear integrable dynamical systems

There is developed a differential-algebraic approach to studying the representations of commuting differentiations in functional differential rings under nonlinear differential constraints. An example of the differential ideal with the only one conserved quantity is analyzed in detail, the corresponding Lax type representations of differentiations are constructed for an infinite hierarchy of nonlinear dynamical systems of the Burgers and Korteweg–de Vries type. A related infinite bi-Hamiltonian hierarchy of Lax type dynamical systems is constructed.     

THE NEW INTEGRABLE SYSTEM OF THE COMPLEX FORM AND THECOUPLED MKDV HIERARCHY

In this paper, the new coupled MKdV hierarchy and their Lsx pairs are oinained,Through introducing a suitable complex form of symplectic structure [5,8], a new integraHe sys-tem of the complex form in the Liouville sense is generated. Moreover, the representations of the solution for the coupled MKdV hierarchy are given by the invohifive solutions of the commutable .     

THE FRACTIONAL QUADRATIC-FORM IDENTITY AND BI-HAMILTONIAN STRUCTURES OF AN INTEGRABLE COUPLING OF THE FRACTIONAL COUPLED BURGERS HIERARCHY

Based on a general isospectral problem of fractional order and the fractional quadratic-form identity by Yue and Xia, the new integrable coupling of fractional coupled Burgers hierarchy and its fractional bi-Hamiltonian structures are obtained.     

Hierarchy of the matrix Burgers equations and integrable reductions in the Davey-Stewartson system

We investigate integrable reductions in the Davey-Stewartson model and introduce the hierarchy of the matrix Burgers equations. By using the method of nonlocal reductions in linear problems associated with the hierarchy of the Davey-Stewartson-II equations, we establish a nontrivial relation between these equations and a system of matrix Burgers equations. In an explicit form, we present reductions of the Davey-Stewartson-II model that admit linearization. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 2, pp. 252–263, February, 1998.     

Exact solutions of equations for the Burgers hierarchy

Some classes of the rational, periodic and solitary wave solutions for the Burgers hierarchy are presented. The solutions for this hierarchy are obtained by using the generalized Cole–Hopf transformation.     

Self-similar solutions of the Burgers hierarchy

Self-similar solutions of the equations for the Burgers hierarchy are presented.