摘要
本文否定地回答了周友成提出的闭L映射的逆是否保持θ-加细性的问题,给出反例说明,即使定义域空间是T_2空间,闭L映射的逆也不保持θ-加细性.
In this paper,we give an example to show,if the domain is nonregular, the θ-refinabi lity is not inversely preserved under colsed Lindelof mappings, so we answer a question raised by Zhou Youcheng negatively.
出处
《辽宁师范大学学报（自然科学版）》
CAS
1992年第4期274-275,共2页
Journal of Liaoning Normal University:Natural Science Edition
关键词
闭L映射
(可数)θ-加细
强仿紧
Closed Lindelof mapping
(countable)θ-refinable
strong paracompact
