摘要
设X是逆系统{Xα,παβ,Λ}的极限,|Λ|=λ,假设每个投射πα:X→Xα是开且到上的,X是λ-超仿紧的,如果每个Xα是可遮的,则X是超仿紧的.
Let X be the limit of
an inverse system { X α π α β Λ } and λ be the cardinal number of Λ
.Suppose each projection π α:X→X α is an open and onto map and X is λ
hyperparacompact,if each X α is screenable,then X is hyperparacompact.Moreover,the
author obtained the analogous result for hereditarity screenable properties.
出处
《四川大学学报(自然科学版)》
CAS
CSCD
北大核心
1999年第4期664-667,共4页
Journal of Sichuan University(Natural Science Edition)
基金
湖北省教育委员会科学研究计划项目
关键词
逆极限
超仿紧
遗传可遮
可遮空间
拓扑空间
inverse limit
hyperparacompact
screenable
hereditarily screenable