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arXiv math-ph/0506067math-phmath.MPnlin.SI
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势非经典对称性与快速扩散方程的解

Potential Nonclassical Symmetries and Solutions of Fast Diffusion Equation

Roman O. Popovych, Olena O. Vaneeva, Nataliya M. Ivanova

摘要:

在Gandarias [Phys. Lett. A 286(2001)153-160]。在研究了非经典对称性关于变换群的等价性之后,我们对相应势方程的非经典对称性进行了完全的分类。结果,得到了一类新的广义的快扩散方程的势非经典对称。已知的精确非李解的集合补充了类似的。结果表明,所有已知的非李解的快速扩散方程是用尽的那些可以构造在一个规则的方式与上述潜在的非经典对称。发现了快扩散方程的非经典对称类与势非经典对称类之间的联系。

英文摘要:

The fast diffusion equation $u_t=(u^{-1}u_x)_x$ is investigated from the symmetry point of view in development of the paper by Gandarias [Phys. Lett. A 286 (2001) 153-160]. After studying equivalence of nonclassical symmetries with respect to a transformation group, we completely classify the nonclassical symmetries of the corresponding potential equation. As a result, new wide classes of potential nonclassical symmetries of the fast diffusion equation are obtained. The set of known exact non-Lie solutions are supplemented with the similar ones. It is shown that all known non-Lie solutions of the fast diffusion equation are exhausted by ones which can be constructed in a regular way with the above potential nonclassical symmetries. Connection between classes of nonclassical and potential nonclassical symmetries of the fast diffusion equation is found.

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