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arXiv 0901.0647nlin.SI
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特征线法可积非线性方程与交换向量场方程的关系

On the relationship between nonlinear equations integrable by the method of characteristics and equations associated with commuting vector fields

A. I. Zenchuk

摘要:

最近的研究表明,矩阵场的Frobenius约化揭示了非线性偏微分方程($S$ -可积偏微分方程)、非线性偏微分方程($C$ -可积偏微分方程)和非线性偏微分方程($Ch$ -可积偏微分方程)之间有趣的关系。然而,目前研究的$S$ -可积偏微分方程只有两类:一类是孤立子方程,如Korteweg-de Vries,Nonlinear Shrödinger,Kadomtsev-Petviashvili和Davey-Stewartson方程;另一类是$GL(N,\CC)$自对偶型偏微分方程,如Yang-Mills方程。本文考虑了另一类$S$ -可积偏微分方程的简单五维非线性偏微分方程,即向量场对交换条件下的标量非线性偏微分方程。我们发现它的起源从(1+1)维层次的$Ch$ -可积偏微分方程后,一定的组成Frobenius型和微分减少施加在矩阵领域。上述标量非线性偏微分方程的矩阵推广也将得到。

英文摘要:

It was shown recently that Frobenius reduction of the matrix fields reveals interesting relations among the nonlinear Partial Differential Equations (PDEs) integrable by the Inverse Spectral Transform Method ($S$-integrable PDEs), linearizable by the Hoph-Cole substitution ($C$-integrable PDEs) and integrable by the method of characteristics ($Ch$-integrable PDEs). However, only two classes of $S$-integrable PDEs have been involved: soliton equations like Korteweg-de Vries, Nonlinear Shrödinger, Kadomtsev-Petviashvili and Davey-Stewartson equations, and $GL(N,\CC)$ Self-dual type PDEs, like Yang-Mills equation. In this paper we consider the simple five-dimensional nonlinear PDE from another class of $S$-integrable PDEs, namely, scalar nonlinear PDE which is commutativity condition of the pair of vector fields. We show its origin from the (1+1)-dimensional hierarchy of $Ch$-integrable PDEs after certain composition of Frobenius type and differential reductions imposed on the matrix fields. Matrix generalization of the above scalar nonlinear PDE will be derived as well.

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