不严格的点式吸引子

IF 0.5 4区 数学 Q3 MATHEMATICS Indagationes Mathematicae-New Series Pub Date : 2024-01-01 DOI:10.1016/j.indag.2023.10.002
Magdalena Nowak
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引用次数: 0

摘要

我们处理的是豪斯多夫空间 X 上连续映射的有限族 F。如果该空间的非空紧凑子集 A 有一个开放邻域 U,使得对于每个非空紧凑 S⊂U,A=limn→∞Fn(S),则该子集称为严格吸引子。每个严格吸引子都是点式吸引子,这意味着集合{x∈X;limn→∞Fn(x)=A}的内部包含A。我们提出了一类点式吸引子的例子--从有限集到西尔潘斯基地毯--当我们在系统中加入一个非膨胀映射时,这些吸引子就不是严格的了。
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Pointwise attractors which are not strict

We deal with the finite family F of continuous maps on the Hausdorff space X. A nonempty compact subset A of such space is called a strict attractor if it has an open neighborhood U such that A=limnFn(S) for every nonempty compact SU. Every strict attractor is a pointwise attractor, which means that the set {xX;limnFn(x)=A} contains A in its interior.

We present a class of examples of pointwise attractors – from the finite set to the Sierpiński carpet – which are not strict when we add to the system one nonexpansive map.

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来源期刊
CiteScore
1.20
自引率
16.70%
发文量
74
审稿时长
79 days
期刊介绍: Indagationes Mathematicae is a peer-reviewed international journal for the Mathematical Sciences of the Royal Dutch Mathematical Society. The journal aims at the publication of original mathematical research papers of high quality and of interest to a large segment of the mathematics community. The journal also welcomes the submission of review papers of high quality.
期刊最新文献
Editorial Board Directional ergodicity, weak mixing and mixing for Zd- and Rd-actions Correlations of the Thue–Morse sequence Correlation functions of the Rudin–Shapiro sequence Inter-model sets in Rd are model sets
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