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arXiv 1506.02563nlin.SI
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关于非线性可积方程的拉克斯对的构造方法

On a method for constructing the Lax pairs for nonlinear integrable equations

I. T. Habibullin, A. R. Khakimova, M. N. Poptsova

摘要:

本文提出了一种寻找非线性可积方程的拉克斯对的直接算法。它对连续和离散模型都是有效的。对应于一个给定的非线性方程的拉克斯对的第一个运营商被立即发现,符合所考虑的非线性方程的线性化。第二个是作为线性化方程的不变流形。讨论了拉克斯对的第二个算子和递归算子之间的一个令人惊讶的简单关系:递归算子可以立即从拉克斯对中找到。文章中考虑的例子是令人信服的证据,发现拉克斯对不同于经典的。这些例子还表明,所建议的对象是真正的拉克斯对,它允许建设的守恒律和更高的对称性的无穷级数。在双曲型偏微分方程的情况下,我们的算法略有修改;为了从不变流形构造拉克斯对,我们使用相应的无穷拉普拉斯序列的截断条件。该方法的效率示出的应用程序中给出的Svinolupov-Sokolov分类列表中的拉克斯对和递归算子没有被发现较早的一些方程。

英文摘要:

We suggest a direct algorithm for searching the Lax pairs for nonlinear integrable equations. It is effective for both continuous and discrete models. The first operator of the Lax pair corresponding to a given nonlinear equation is found immediately, coinciding with the linearization of the considered nonlinear equation. The second one is obtained as an invariant manifold to the linearized equation. A surprisingly simple relation between the second operator of the Lax pair and the recursion operator is discussed: the recursion operator can immediately be found from the Lax pair. Examples considered in the article are convincing evidence that the found Lax pairs differ from the classical ones. The examples also show that the suggested objects are true Lax pairs which allow the construction of infinite series of conservation laws and hierarchies of higher symmetries. In the case of the hyperbolic type partial differential equation our algorithm is slightly modified; in order to construct the Lax pairs from the invariant manifolds we use the cutting off conditions for the corresponding infinite Laplace sequence. The efficiency of the method is illustrated by application to some equations given in the Svinolupov-Sokolov classification list for which the Lax pairs and the recursion operators have not been found earlier.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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