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arXiv 1702.06190math.DS
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旋转集合的面向集合的数值计算

Set-oriented numerical computation of rotation sets

Katja Polotzek, Kathrin Padberg-Gehle, Tobias Jäger

摘要:

本文建立了一个面向集合的算法,用于计算同伦的二环面同胚的旋转集对恒等式的数值逼近。通过ε-旋转集的概念给出了理论背景。这些是通过在Misiurewicz-Ziemian旋转集的定义中用ε-伪轨道代替轨道而得到的,并且当ε减到零时收敛到后者。在此基础上,我们证明了当精度和迭代时间趋于无穷大时,该数值逼近的收敛性。此外,我们提供了分析误差估计的算法下一个额外的有界性假设,这是已知的,在许多相关的情况下,特别是非空的内部旋转集。

英文摘要:

We establish a set-oriented algorithm for the numerical approximation of the rotation set of homeomorphisms of the two-torus homotopic to the identity. A theoretical background is given by the concept of ε-rotation sets. These are obtained by replacing orbits with ε-pseudo-orbits in the definition of the Misiurewicz-Ziemian rotation set and are shown to converge to the latter as ε decreases to zero. Based on this result, we prove the convergence of the numerical approximations as precision and iteration time tend to infinity. Further, we provide analytic error estimates for the algorithm under an additional boundedness assumption, which is known to hold in many relevant cases and in particular for non-empty interior rotation sets.

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