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arXiv 1603.08360math.DSmath.NT
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马尔可夫树和欧几里德树的李雅普诺夫谱

Lyapunov spectrum of Markov and Euclid trees

K. Spalding, A. P. Veselov

摘要:

我们研究了马尔可夫动力学的李雅普诺夫指数$Λ(x)$作为路径的函数由$x\in \mathbb RP^1$在一个二叉平面树,描述马尔可夫三元组和他们的“热带”版本-欧几里得三元组。我们证明了相应的李雅普诺夫谱是$[0, \ln φ]$,其中$φ$是黄金分割比,并证明了在最无理数的Markov-Hurwitz集$\mathbb{X}$上,相应的函数$Λ_\mathbb{X}$是单调递增的,并且在Farey参数化下是凸的。

英文摘要:

We study the Lyapunov exponents $Λ(x)$ for Markov dynamics as a function of path determined by $x\in \mathbb RP^1$ on a binary planar tree, describing the Markov triples and their "tropical" version - Euclid triples. We show that the corresponding Lyapunov spectrum is $[0, \ln φ]$, where $φ$ is the golden ratio, and prove that on the Markov-Hurwitz set $\mathbb{X}$ of the most irrational numbers the corresponding function $Λ_\mathbb{X}$ is monotonically increasing and in the Farey parametrization is convex.

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