Frechet-Urysohn for finite sets

被引:18
|
作者
Gruenhage, G
Szeptycki, PJ [1 ]
机构
[1] York Univ, Atkinson Fac, N York, ON M3J 1P3, Canada
[2] Auburn Univ, Dept Math, Auburn, AL 36830 USA
基金
美国国家科学基金会; 加拿大自然科学与工程研究理事会;
关键词
Frechet-Urysohn; pi-network; alpha(i)-spaces;
D O I
10.1016/j.topol.2003.09.014
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
E. Reznichenko and O. Sipacheva called a space X "Frechet-Urysohn for finite sets" if the following holds for each point X E X: whenever P is a collection of finite subsets of X such that every neighborhood of x contains a member of P, then P contains a subfamily that converges to x. We continue their study of this property. We also look at analogous notions obtained by restricting to collections P of bounded size, we discuss connections with topological groups, the alpha(i)-properties of A.V. Arhangel'skii, and with a certain topological game. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:238 / 259
页数:22
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