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
中科院分区:
文献类型:
--
作者:
Yuru Zou;Derong Kong
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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