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arXiv 1701.00563math.DS
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随机$\mathbb{Z}^k$作用的熵公式

Entropy Formula for Random $\mathbb{Z}^k$-actions

Yujun Zhu

摘要:

本文考虑了随机$\mathbb{Z}^k$作用的熵,包括测度熵和拓扑熵,这些作用是由$\mathbb{Z}^k$作用的生成元的随机合成所产生的.应用Pesin的交换同构理论,通过生成元的李雅普诺夫谱,得到了$C^{2}$随机$\mathbb{Z}^k$作用的测度论熵公式.对于由Lipschitz映射、有限图上的连续映射和$C^{1}$扩张映射等更一般的映射生成的随机$\mathbb{Z}^k$(或$\mathbb{Z}_+^k$)作用,也得到了拓扑熵的一些公式和界.此外,作为应用,我们给出了某些$C^{2}$ $\mathbb{Z}^k$作用的Friedland熵公式.

英文摘要:

In this paper, entropies, including measure-theoretic entropy and topological entropy, are considered for random $\mathbb{Z}^k$-actions which are generated by random compositions of the generators of $\mathbb{Z}^k$-actions. Applying Pesin's theory for commutative diffeomorphisms we obtain a measure-theoretic entropy formula of $C^{2}$ random $\mathbb{Z}^k$-actions via the Lyapunov spectra of the generators. Some formulas and bounds of topological entropy for certain random $\mathbb{Z}^k$(or $\mathbb{Z}_+^k$ )-actions generated by more general maps, such as Lipschitz maps, continuous maps on finite graphs and $C^{1}$ expanding maps, are also obtained. Moreover, as an application, we give a formula of Friedland's entropy for certain $C^{2}$ $\mathbb{Z}^k$-actions.

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