摘要
本文从研究半拓扑子集出发，给出了极不连通空间的若干新特征。我们还研究了半连续映射。
This paper starts from semi-topological subsets and proves that extremally disconnected space is newly characterized by some equivalent conditions.And the relations among semi-continuous mapping,almost open mapping and irresolute mapping are also studied.
出处
《延安大学学报（自然科学版）》
1997年第2期14-17,共4页
Journal of Yan'an University：Natural Science Edition
关键词
极不连通空间
半预开集
预开集
δ-开(闭)集
extremally disconnected space
semi-pre-open sets
pre-open sets
δ-open(closed)sets.
