端空间与射线空间覆盖性质的探讨
组合数学
2026-01-21 v3 一般拓扑
摘要
我们给出了关于端空间和射线空间覆盖性质组合特征的新结果。具体而言,我们对射线空间、端空间和边缘空间的 Lindelöf 度、extent、Rothberger 性质、-紧凑性以及 Menger 性质进行了表征。我们证明了这些空间中-紧凑性与 Menger 性质等价,并且它们都是 -空间。作为若干这些表征的应用,我们能够为具有可数个端和边缘的图提供组合特征。
引用
@article{arxiv.2510.10825,
title = {On covering properties of end and ray spaces},
author = {Rodrigo Rey Carvalho and Matheus Duzi and Vinicius de Oliveira Rodrigues},
journal= {arXiv preprint arXiv:2510.10825},
year = {2026}
}
备注
A few new results, including a combinatorial chracterization of graphs with countably many ends and edge and/or edge-ends. The introduction now presents a list of the main results of this paper