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arXiv 1106.4801math-phmath.APmath.MP
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一类非线性波方程的完全群分类

Complete group classification of a class of nonlinear wave equations

Alexander Bihlo, Elsa Dos Santos Cardoso-Bihlo, Roman O. Popovych

摘要:

初步的群分类作为微分方程对称性分析的一种方法变得突出,这要归功于Algimov,Torrisi和Valenti的论文[J. Math.Phys.32,2988-2995],其中通过对无穷维线性波非线性波方程的固定有限维子代数的一维Lie对称扩张的分类,对一类非线性波方程进行了部分初步群分类.这是我们所考虑的类的维等价代数。本文利用群分类的代数方法,实现了在通常和一般点等价的情况下,同一类的完全群分类。这包括完整的初步组分类的类和寻找李对称扩展不相关的子代数的等价代数。完整的初步组分类是基于列出所有不等价的子代数的整个无限维等价代数的投影是合格的核代数的最大扩展。集合的容许点变换的类是详尽描述的分区的类到规范化的子类。给出了求一般微分方程完全等价群的一种代数方法。

英文摘要:

Preliminary group classification became prominent as an approach to symmetry analysis of differential equations due to the paper by Ibragimov, Torrisi and Valenti [J. Math. Phys. 32, 2988-2995] in which partial preliminary group classification of a class of nonlinear wave equations was carried out via the classification of one-dimensional Lie symmetry extensions related to a fixed finite-dimensional subalgebra of the infinite-dimensional equivalence algebra of the class under consideration. In the present paper we implement, up to both usual and general point equivalence, the complete group classification of the same class using the algebraic method of group classification. This includes the complete preliminary group classification of the class and finding Lie symmetry extensions which are not associated with subalgebras of the equivalence algebra. The complete preliminary group classification is based on listing all inequivalent subalgebras of the whole infinite-dimensional equivalence algebra whose projections are qualified as maximal extensions of the kernel algebra. The set of admissible point transformations of the class is exhaustively described in terms of the partition of the class into normalized subclasses. A version of the algebraic method for finding the complete equivalence groups of a general class of differential equations is proposed.

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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