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arXiv 0908.2350math.DSmath.NT
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分形上的丢番图逼近

Diophantine approximations on fractals

Manfred Einsiedler, Lior Fishman, Uri Shapira

摘要:

我们利用对角作用的动力学性质,得到丢番图逼近的结果。特别地,我们证明了中间三分之一康托尔集(关于自然测度)上几乎任何点的连分数展开包含所有有限模式(因此是很好的逼近).类似地,我们证明了对于[0,1]^2中具有某种对称性的各种分形,几乎任何点都不是Dirichlet可改进的(因此是很好的可逼近的),并且具有性质C(在Cassels之后)。然后,我们解决了类似的方法M的一个猜想。Boshernitzan说,在单位区间内没有无理数x使得{nxmod 1:n是自然数}的连分数展开式一致最终有界。

英文摘要:

We exploit dynamical properties of diagonal actions to derive results in Diophantine approximations. In particular, we prove that the continued fraction expansion of almost any point on the middle third Cantor set (with respect to the natural measure) contains all finite patterns (hence is well approximable). Similarly, we show that for a variety of fractals in [0,1]^2, possessing some symmetry, almost any point is not Dirichlet improvable (hence is well approximable) and has property C (after Cassels). We then settle by similar methods a conjecture of M. Boshernitzan saying that there are no irrational numbers x in the unit interval such that the continued fraction expansions of {nx mod1 : n is a natural number} are uniformly eventually bounded.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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