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arXiv 1208.0131math.DS
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近似分布与测地流

Distribution of approximants and geodesic flows

Albert M. Fisher, Thomas A. Schmidt

摘要:

对模群的任意有限指数子群,几乎每个实数都有其正则连分数逼近量按加权尖点宽度等分布到子群的尖点,给出了Moeckel结果的一个新证明.我们的证明使用了一个斜积在一个横截面上的测地流的模块表面。我们的技巧表明,同样的结果适用于由Nakada的α-连分数发现的逼近,并且类似的结果也适用于由任何Rosen的λ-连分数给出的代数数的逼近,与Hecke三角形富克斯群的无限族有关。

英文摘要:

We give a new proof of Moeckel's result that for any finite index subgroup of the modular group, almost every real number has its regular continued fraction approximants equidistributed into the cusps of the subgroup according to the weighted cusp widths. Our proof uses a skew product over a cross-section for the geodesic flow on the modular surface. Our techniques show that the same result holds true for approximants found by Nakada's α-continued fractions, and also that the analogous result holds for approximants that are algebraic numbers given by any of Rosen's λ-continued fractions, related to the infinite family of Hecke triangle Fuchsian groups.

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