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arXiv 1005.5604math.DS
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不变环面定理的一个简单证明

A simple proof of the invariant torus theorem

Jacques Féjoz

摘要:

本文给出了哈密顿系统中关于准周期不变环面持久性的Kolmogorov定理的一个简单证明。该定理首先减少到一个适定的反演问题(赫尔曼的标准形式)切换频率障碍从一侧的共轭到另一个。然后证明包括应用一个简单的,很适合的,反函数定理的分析范畴,这本身依赖于牛顿算法和插值不等式。与其他证据的比较包括在附录中。

英文摘要:

We give a simple proof of Kolmogorov's theorem on the persistence of a quasiperiodic invariant torus in Hamiltonian systems. The theorem is first reduced to a well-posed inversion problem (Herman's normal form) by switching the frequency obstruction from one side of the conjugacy to another. Then the proof consists in applying a simple, well suited, inverse function theorem in the analytic category, which itself relies on the Newton algorithm and on interpolation inequalities. A comparison with other proofs is included in appendix.

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