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集体次正规空间的逆极限与无限Tychonoff积
Inverse limits and infinite tychonoff products about collectionwise subnormal spaces
【摘要】 主要证明:(1)并且每个是开满映射,如果X是|∑|-完满的且每个Xσ是集体次正规空间,则X是集体次正规空间.(2)如果是|A|-完满正规的,则X是集体次正规空间当且仅当是集体次正规的.同时指出:遗传集体次正规也有相应的性质.
【Abstract】 This paper mainly proves the results:(1)Let X=and every πσ. be open andonto mapping, if X is norma|Σ|-paracompact and every Xσ is collectionwise subnormal, then X iscollectionwise subnormal;(2)Let X=ΠαeAX-α is normal|A|-paracompact,X is collectionwise subnormalif ΠαeσX-α is collectionwise subnormal for every σ∈[A]]. Next, we point out that there exist thesimilar results to hereditarily collectionwise subnormal spaces.
【关键词】 逆极限;
|∑|-完满正规;
遗传;
正规;
集体次正规;
【Key words】 inverse limit; |∑|-paracompact; hereditarily; normal; collectionwise subnormal;
【Key words】 inverse limit; |∑|-paracompact; hereditarily; normal; collectionwise subnormal;
【基金】 四川省教育厅自然科学基金(重点基金)资助课题.
- 【文献出处】 西南民族学院学报(自然科学版) ,Journal of Southwest Nationalities College(Natural Science Edition) , 编辑部邮箱 ,2002年02期
- 【分类号】O189.11
- 【被引频次】8
- 【下载频次】15