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arXiv 2009.01318math.GNmath.DS
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拓扑空间中的渐近compactness

Asymptotic compactness in topological spaces

Junya Nishiguchi

摘要:

对于具有连续时间或离散时间的拓扑半动力系统,Ω极限集对于构造全局吸引子起着重要作用。因此,重要的是要知道什么时候Ω极限集成为非空紧集。本文的目的是理解拓扑空间的子集网在渐近意义下是紧的机制。为此,我们引入了子集网的渐近紧性概念,并研究了它与极限集紧性的关系。本文证明了在一致化空间中,对于给定的非空子集网,渐近紧性与极限集是网从上收敛到的非空紧集的性质是等价的.通过引入有向集序列性的概念,我们还研究了渐近紧性概念的序列形式。

英文摘要:

The omega limit sets plays a fundamental role to construct global attractors for topological semi-dynamical systems with continuous time or discrete time. Therefore, it is important to know when omega limit sets become nonempty compact sets. The purpose of this paper is to understand the mechanism under which a given net of subsets of topological spaces is compact in the asymptotic sense. For this purpose, we introduce the notion of asymptotic compactness for nets of subsets and study the connection with the compactness of the limit sets. In this paper, for a given net of nonempty subsets, we prove that the asymptotic compactness and the property that the limit set is a nonempty compact set to which the net converges from above are equivalent in uniformizable spaces. We also study the sequential version of the notion of asymptotic compactness by introducing the notion of sequentiality of directed sets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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