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arXiv math-ph/0509074math-phmath.MP
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具有双参数对称群的三阶常微分方程的李方法积分

Integration of Third Order Ordinary Differential Equations Possessing Two-Parameter Symmetry Group by Lie's Method

Mladen Nikolic, Milan Rajkovic

摘要:

利用群论的方法,得到了一类具有两参数李对称群的三阶常微分方程的解。它表明,减少到求积是可能的,根据两种情况:1)如果在第一次降阶后,所获得的二阶常微分方程除了继承的点对称性获得至少一个新的点对称性(可能是一个隐藏的II型对称性)。2)首先,构造了具有四参数对称群的四阶微分方程使一阶方程具有一个已知(继承)对称性的约化路径。然后,约化路径沿具有两个参数的对称群出现的三阶方程被挑选出来,并遵循,直到一个一阶方程具有一个已知的(继承)对称性得到。该方法使用条件的保存,消失和再现的点对称性。

英文摘要:

The solution of a class of third order ordinary differential equations possessing two parameter Lie symmetry group is obtained by group theoretic means. It is shown that reduction to quadratures is possible according to two scenarios: 1) if upon first reduction of order the obtained second order ordinary differential equation besides the inherited point symmetry acquires at least one more new point symmetry (possibly a hidden symmetry of Type II). 2) First, reduction paths of the fourth order differential equations with four parameter symmetry group leading to the first order equation possessing one known (inherited) symmetry are constructed. Then, reduction paths along which a third order equation possessing two-parameter symmetry group appears are singled out and followed until a first order equation possessing one known (inherited) symmetry are obtained. The method uses conditions for preservation, disappearance and reappearance of point symmetries.

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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