On a problem of countable expansions

On a problem of countable expansions
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关于可数展开式问题

DOI:
10.1016/j.jnt.2015.06.017
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发表时间:
2015-03
影响因子:
0.7
通讯作者:
Derong Kong
Derong Kong
中科院分区:
数学3区
文献类型:
--
作者:
Yuru Zou;Derong Kong

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对于一个真实的数q∈(1,2),x∈[0,1/(q− 1)],如果x=∑ i= 1∞ di q i,di ∈{0,1}对所有i≥ 1,则称无限序列(di)是x的q-展开。对于m= 1,2,n或n = 0,我们用B m表示q∈(1,2)的集合,使得存在x∈[0,1/(q− 1)],其具有恰好m个不同的q-展开式。Sidorov [18]证明了q2:= min <$B2 <$1.71064,后来Baker [1]问q2是否∈ B <$0?本文对这个问题给出了否定的回答,并得出结论:B 0不是闭集。特别地,我们给出了x∈[0,1/(q 2− 1)]恰好有两个不同的q 2-展开式的完整描述。
For a real number q∈(1, 2) and x∈[0, 1/(q− 1)], the infinite sequence (d i) is called a q-expansion of x if x=∑ i= 1∞ d i q i, d i∈{0, 1} for all i≥ 1. For m= 1, 2,⋯ or ℵ 0 we denote by B m the set of q∈(1, 2) such that there exists x∈[0, 1/(q− 1)] having exactly m different q-expansions. It was shown by Sidorov [18] that q 2:= min⁡ B 2≈ 1.71064, and later asked by Baker [1] whether q 2∈ B ℵ 0? In this paper we provide a negative answer to this question and conclude that B ℵ 0 is not a closed set. In particular, we give a complete description of x∈[0, 1/(q 2− 1)] having exactly two different q 2-expansions.
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