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arXiv 0808.0958nlin.SI
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关于非线性常微分方程的完全可积性和线性化--第III部分:耦合的一阶方程

On the complete integrability and linearization of nonlinear ordinary differential equations - Part III: Coupled first order equations

V. K. Chandrasekar, M. Senthilvelan, M. Lakshmanan

摘要:

继续我们对非线性常微分方程完全可积性的研究,本文考虑一类自治和非自治耦合的一阶非线性常微分方程组的可积性.为此,我们修改了原来的Prelle-Singer程序,使其适用于自治和非自治系统的耦合一阶常微分方程。我们简要地解释了通过扩展Prelle-Singer(PS)方法来寻找两个和三个耦合的一阶常微分方程的运动积分(与时间无关的积分以及与时间相关的积分)的方法。由此,我们试图回答原始PS方法中的一些开放性问题。我们还确定了二维Lotka-Volterra系统和三维R $\ddot{o}$ ssler系统的可积情况,以及其他的例子,包括非自治系统在一个简单的方式使用这个程序。最后,我们发展了一个线性化程序耦合的一阶常微分方程。

英文摘要:

Continuing our study on the complete integrability of nonlinear ordinary differential equations, in this paper we consider the integrability of a system of coupled first order nonlinear ordinary differential equations (ODEs) of both autonomous and non-autonomous types. For this purpose, we modify the original Prelle-Singer procedure so as to apply it to both autonomous and non-autonomous systems of coupled first order ODEs. We briefly explain the method of finding integrals of motion (time independent as well as time dependent integrals) for two and three coupled first order ODEs by extending the Prelle-Singer(PS) method. From this we try to answer some of the open questions in the original PS method. We also identify integrable cases for the two dimensional Lotka-Volterra system and three-dimensional R$\ddot{o}$ssler system as well as other examples including non-autonomous systems in a straightforward way using this procedure. Finally, we develop a linearization procedure for coupled first order ODEs.

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