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arXiv 1402.1979math.DS
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法律问题$3x+1$的动态

Dynamique du problème $3x+1$ sur la droite réelle

Nik Lygeros, Olivier Rozier

摘要:

3x+1问题是一个很难的猜想,它涉及到正整数的一个相当简单的算法。一个可能的方法是超越问题的离散性,遵循M。Chamberland使用了半线$\mathbb{R}^{+}$的分析扩展。我们完成了他关于临界点动力学的结果,得到了一个新的公式3x+1问题。我们澄清的链接与问题的存在性徘徊的间隔。然后,我们将动力学的研究扩展到半线$\mathbb{R}^{-}$,与3x-1问题。最后,我们分析了实迭代在无穷大附近的平均行为,并提出了一种基于R. E.克兰德尔在离散的情况下。由此得出,在模2均匀分布的条件下,迭代的平均增长率接近于$(2+\sqrt{3})/4$。

英文摘要:

The 3x+1 problem is a difficult conjecture dealing with quite a simple algorithm on the positive integers. A possible approach is to go beyond the discrete nature of the problem, following M. Chamberland who used an analytic extension to the half-line $\mathbb{R}^{+}$. We complete his results on the dynamic of the critical points and obtain a new formulation the 3x+1 problem. We clarify the links with the question of the existence of wandering intervals. Then, we extend the study of the dynamic to the half-line $\mathbb{R}^{-}$, in connection with the 3x-1 problem. Finally, we analyze the mean behaviour of real iterations near infinity and present a method based on a heuristic argument by R. E. Crandall in the discrete case. It follows that the average growth rate of the iterates is close to $(2+\sqrt{3})/4$ under a condition of uniform distribution modulo 2.

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