The growth rate of the partial quotients in a class of continued fractions with parameters

The growth rate of the partial quotients in a class of continued fractions with parameters
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一类带参数的连分数中的部分商的增长率

DOI:
10.1016/j.jnt.2014.06.012
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发表时间:
2014-12
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
Liang Tang
Liang Tang
中科院分区:
其他
文献类型:
--
作者:
Ting Zhong;Liang Tang

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摘要让我们:N→ R是满足条件<$(k)+ k+ 1> 0的参数函数,T <$:(0,1]→(0,1]是由T <$(x)=− 1+(k+ 1)x1 +<$(k)− k <$(k)x定义的变换,x∈(1/(k+ 1),1/k]。在算法T中,每个x∈(0,1]都附加一个展开式,称为F的带参数广义连分式展开式. Schweiger [3].通过k 1(x)= k 1(T <$n − 1(x))和k n(x)= k 1(T <$n− 1(x))对每个n≥ 2,定义x的部分幂元的序列{k n(x)} n≥ 1。很明显,在参数函数满足的条件下,对于所有n≥ 1,kn + 1(x)≥ kn(x)。本文考虑了由E ∈(α):={x∈(0,1]:kn + 1(x)≥ kn(x)α,对所有n≥ 1}给出的集合的大小,对任何α≥ 1.我们证明了dim H <$E <$(α)={1 α,当<$(k)<$$> 0(常数); 1 α− β+ 1,当<$(k)<$k β且α≥ β≥ 1; 1,当<$(k)<$k β且α< β。其中dim H表示Hausdorff维数。第一个结果推广了J. Wu [5]的一个结果,他考虑了当λ = 0时的情形(即Engel展开)。
Abstract Let ϵ: N→ R be a parameter function satisfying the condition ϵ (k)+ k+ 1> 0 and let T ϵ:(0, 1]→(0, 1] be a transformation defined by T ϵ (x)=− 1+(k+ 1) x 1+ ϵ (k)− k ϵ (k) x for x∈(1/(k+ 1), 1/k]. Under the algorithm T ϵ, every x∈(0, 1] is attached an expansion, called generalized continued fraction expansion with parameters by F. Schweiger [3]. Define the sequence {k n (x)} n≥ 1 of the partial quotients of x by k 1 (x)=⌊ 1/x⌋ and k n (x)= k 1 (T ϵ n− 1 (x)) for every n≥ 2. It is clear that under the condition satisfied by the parameter function ϵ, k n+ 1 (x)≥ k n (x) for all n≥ 1. In this paper, we consider the size of the set given by E ϵ (α):={x∈(0, 1]: k n+ 1 (x)≥ k n (x) α for all n≥ 1} for any α≥ 1. We show that dim H⁡ E ϵ (α)={1 α, when ϵ (k)≡ ϵ 0 (constant); 1 α− β+ 1, when ϵ (k)∼ k β and α≥ β≥ 1; 1, when ϵ (k)∼ k β and α< β. where dim H denotes the Hausdorff dimension. The first result generalizes a result of J. Wu [5] who considered the case when ϵ≡ 0 (ie, Engel expansion).
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