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arXiv math-ph/0501070math-phmath.CAmath.MP
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三维子代数在微分方程隐对称分析中的作用

The Role of Three-dimensional Subalgebra in the Analysis of Hidden Symmetries of Differential Equations

Mladen Nikolic, Milan Rajkovic

摘要:

从微分方程对称的三维子代数的角度分析了常微分方程在第一次降阶后以点对称形式消失,第二次降阶后又重新出现的对称的一些新性质.一个隐藏的对称性的形式是由两部分组成,其中之一始终保持作为一个点对称性,和第二(基本)部分的行为作为完整的隐藏对称性。对称性消失的点对称性,并保持隐藏(非本地)在$n$减少的顺序之前,重新出现的点对称性也被引入,并称为可转换对称性的顺序$n-1.$我们讨论了必要性,这样的分类,以区分它们从隐藏的对称性的I型和II型,这是相对于减少的顺序由一个。

英文摘要:

Some new properties of symmetries that disappear as point symmetries after the first reduction of order of an ODE and reappear after the second are analyzed from the aspect of three-dimensional subalgebra of symmetries of differential equations. The form of a hidden symmetry is shown to consist of two parts, one of which always remains preserved as a point symmetry, and the second (fundamental) part which behaves as the complete hidden symmetry. Symmetry that disappears as point symmetry and remains hidden (non-local) during $n$ reductions of order before reappearing as a point symmetry is also introduced and termed convertible symmetry of order $n-1.$ We discuss the necessity for such classification in order to distinguish them from hidden symmetries of type I and type II, which are defined with respect to reduction of order by one.

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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