两类特殊曲面的运动及其相应的新的可积方程

利用Ｒ３与ｓｕ（２）之间的对应,考虑了两类特殊曲面的运动及其演化系统 并引入了谱参数     

新的变系数可积耦合非线性Schr(o)dinger方程及其孤子解

基于延拓结构和Hirota双线性方法研究了广义的变系数耦合非线性Schrdinger方程.首先导出了3组新的变系数可积耦合非线性Schrdinger方程及其线性谱问题(Lax对),然后利用Hirota双线性方法给出了它们的单、双向量孤子解.这些向量孤子解在光孤子通讯中有重要的应用.     

新的变系数可积耦合非线性Schr(o)dinger方程及其孤子解

基于延拓结构和Hirota双线性方法研究了广义的变系数耦合非线性Schr(o)dinger方程.首先导出了3组新的变系数可积耦合非线性Schr(o)dinger方程及其线性谱问题(Lax对),然后利用Hirota双线性方法给出了它们的单、双向量孤子解.这些向量孤子解在光孤子通讯中有重要的应用.     

主曲率满足四次函数关系的Weingarten曲面的基本方程和LAX对

讨论三维欧氏空间中两个主曲率满足四次函数关系的Weingarten曲面的可积性,得到其Gauss-Codazzi方程的完全分类,并给出相应的Lax对.     

关于一个可积的广义Hamilton方程族

本文利用ｒ－矩阵生成了一个广义的Ｈａｍｉｌｔｏｎ方程族，并证明了它是广义可积的，然后讨论了它和（４）中Ｌｉｏｖｖｉｌｌｅ可积的新的广义Ｈａｍｉｌｔｏｎ方程族之间的关系。     

旋转曲面及其方程

介绍空间曲线绕空间直线旋转所产生的旋转曲面的定义及其方程的求法。     

获得非线性演化方程Backlund变换的一种新的途径

本文给出一种求非线性演化方程Backlund变换的方法,应用于非线性演化方程时,得到了与WTC方法一致的Backlund变换,避开了WTC方法涉及到的递推关系和截尾的讨论.     

一族耦合Kaup-Newell方程及其相伴可积分解

通过介绍一个含四个位势的4×4矩阵谱问题,得到一个新的非线性发展方程族,其中较有意义的一个方程是耦合Kaup-Newell方程.利用迹恒等式,得到了它的双哈密顿结构.在某个约束条件下,通过特征值问题的非线性化方法,得到了Liouville意义下耦合Kaup-Newell方程新的可积分解.     

一维新的Hamilton可积方程

构造了Loop代数~A_{-1}的一个子代数,利用屠格式导出了一族新的可积孤子方程族,并且是Liouville可积系,具有双Hamilton结构。     

两个新的可积类型的微分方程

研究方程y^1=f（x,y）的可积性,建立了两个可积类型的微分方程y^1=g（x）h（^y——φ（x））＋^φ^1（x）——φ（x）y和^1=^φ（x）——xg（^y——φ（x）＋x^8（^y——φ（x））＋^φ^1（x）——φ（x））y应用变换y=φ（x）u,它们可分别化为x^au′=g（x）h（u）和^dx——du=g（u）x＋h（u）x^β进行求解．     

两族可积的Hamilton方程

把屠规彰格式应用于等谱问题得到了两族可积的Ｈａｍｉｌｔｏｎ方程．得到后一族需要对屠格式进行变更，这为扩大屠格式的应用范围指出了一条途径．     

高亏格曲面上地图的计数

本文给出了可定向曲面(亏格2,3)和不可定向曲面(亏格5)上根瓣丛以边数为参数时相应的计数显式.与此同时,考虑一类与瓣从拓扑等价的地图类: (无环,简单)近2-正则地图,通过一种组合方法,给出了多参数下平面近2一正则地图的计数显式,亦得到了任意亏格曲面上该类地图的具体个数.     

涉及两个n维单形的两类不等式

本文给出了涉及两个 n维单形的两类不等式 ,并得到了两个推论 .     

New Integrable Equations of Nonlinear Schrödinger Type

New integrable matrix nonlinear evolution partial differential equations in (1 + 1)-dimensions are derived, via a treatment which starts from an appropriate matrix generalization of the Zakharov–Shabat spectral problem. Via appropriate parametrizations, multi-vector versions of these equations are also exhibited. Generally these equations feature solitons that do not move with constant velocities: they rather behave as boomerons or as trappons, namely, up to a Galileian transformation, they typically boomerang back to where they came from, or they are trapped to oscillate around some fixed position determined by their initial data. In this paper, meant to be the first of a series, we focus on the derivation and exhibition of new coupled evolution equations of nonlinear Schrödinger type and on the behavior of their single-soliton solutions.     

Induced Surfaces and Their Integrable Dynamics

A method is considered to induce surfaces in three-dimensional (pseudo) Euclidean space via the solutions to two-dimensional linear problems (20 LPs) and their integrable dynamics (deformations) via the 2 + 1-dimensional nonlinear integrable equations associated with these 2D LPs. Coordinates X_i of the induced surfaces are defined as integrals over certain bilinear combinations of the wave functions ψ of these 20 LPs. General formulation as well as three concrete examples are considered. Some properties and features of such induction are discussed. Three-dimensional Riemann spaces associated with 2 + 1-dimensional nonlinear integrable equations are considered also.     

Bilinear Representations of Integrable Equations

We present a method for deriving recursion operators and canonical Lax pairs directly from bilinear identities of the KP type. Examples include the KdV equation, the Boussinesq equation, and a real equivalent of the nonlinear Schrödinger equation.     

Integrable Shallow-Water Equations and Undular Bores

On the basis of the integrable Kaup–Boussinesq version of the shallow-water equations, an analytical theory of undular bores is constructed. A complete classification for the problem of the decay of an initial discontinuity is made.     

Kinetic Equations and Integrable Hamiltonian Systems

A survey of interrelations between kinetic equations and integrable systems is presented. We discuss common origin of special classes of solutions of the Boltzmann kinetic equation for Maxwellian particles and special solutions for integrable evolution equations. The thermodynamic limit and soliton kinetic equation for the integrable Korteweg-de Vries equation are considered. The existence of decaying and degenerate dispersion laws and the appearance of additional integrals of motion for the interacting waves is discussed. __________ Published in Ukrains'kyi Matematychnyi Zhurnal, Vol. 57, No. 6, pp. 731–741, June, 2005.