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arXiv math-ph/0104014math-phmath.MP
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流体动力型系统的群分析

Group analysis of hydrodynamic-type systems

M. B. Sheftel

摘要:

我们研究了具有两个独立变量$t$和$x$的流体动力学型系统的点对称性和更高对称性,其中方程对$t,x$有显式依赖性或没有显式依赖性。我们认为这些系统具有无穷维组的流体动力学对称性,建立存在条件,这个属性,并使用它,得到这些系统的线性化变换。得到了对称性的递推算子,并利用它构造了所研究方程的无穷级数精确解。研究了高阶对称性,即Lie-Backlund变换群,建立了高阶对称性存在条件与递归算子之间的相互关系。虽然也研究了$n$ -组分体系,但对于双组分体系得到了更完整的结果。特别是,我们考虑哈密顿和半哈密顿系统。

英文摘要:

We study point and higher symmetries for the hydrodynamic-type systems with two independent variables $t$ and $x$ with and without explicit dependence of the equations on $t,x$. We consider those systems which possess an infinite-dimensional group of the hydrodynamic symmetries, establish existence conditions for this property and, using it, derive linearizing transformations for these systems. The recursion operators for symmetries are obtained and used for constructing infinite series of exact solutions of the studied equations. Higher symmetries, i.e. the Lie-Backlund transformation groups, are also studied and the interrelation between the existence conditions for higher symmetries and recursion operators is established. More complete results are obtained for two-component systems, though $n$-component systems are also studied. In particular, we consider Hamiltonian and semi-Hamiltonian systems.

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