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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.
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页码:238 / 259
页数:22
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