Borel complexity of sets of normal numbers via generic points in subshifts with specification
Borel complexity of sets of normal numbers via generic points in subshifts with specification
复制标题
通过具有规范的子移位中的通用点计算正常数集的 Borel 复杂性
DOI:
10.1090/tran/8001
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发表时间:
2020
影响因子:
1.3
通讯作者:
Mance, Bill
中科院分区:
文献类型:
--
作者:
Airey, Dylan;Jackson, Steve;Kwietniak, Dominik;Mance, Bill
We study the Borel complexity of sets of normal numbers in several numeration systems. Taking a dynamical point of view, we offer a unified treatment for continued fraction expansions and baseexpansions, and their various generalisations: generalised Lüroth series expansions and-expansions. In fact, we consider subshifts over a countable alphabet generated by all possible expansions of numbers in. Then normal numbers correspond to generic points of shift-invariant measures. It turns out that for these subshifts the set of generic points for a shift-invariant probability measure is precisely at the third level of the Borel hierarchy (it is a-complete set, meaning that it is a countable intersection of-sets, but it is not possible to write it as a countable union of-sets). We also solve a problem of Sharkovsky–Sivak on the Borel complexity of the basin of statistical attraction. The crucial dynamical feature we need is a feeble form of specification. All expansions named above generate subshifts with this property. Hence the sets of normal numbers under consideration are-complete. References
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影响因子:
0.9
作者:
V. Climenhaga;R. Pavlov
通讯作者:
R. Pavlov
影响因子:
1.1
作者:
A.N. Sharkovsky;A. Sivak
通讯作者:
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DOI:
10.4171/jfg/33
发表时间:
2016
期刊:
Annales de l'Institut Fourier
影响因子:
--
作者:
D. Airey;B. Mance
通讯作者:
B. Mance
影响因子:
1.7
作者:
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D. Garling
影响因子:
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作者:
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通讯作者:
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