摘要
In this note,we give some conditions concerning that the countably bi-quotient closed mappings, and the closed mappings with each fiber having a σ-closure preserving outer base, preserve M1-spaces.
In this note, we give some conditions concerning that the countably bi-quotient closed mappings, and the closed mappings with each fiber having a δ-closure preserving outer base, preserve M_1-spaces.
出处
《苏州大学学报（自然科学版）》
CAS
1990年第2期151-159,共9页
Journal of Soochow University(Natural Science Edition)
关键词
M1-空间
双商映射
拟开映射
闭象
M_i-space (i=1, 2, 3), countably bi-quotient mapping, qnasi-open mapping, closure preserving outer base, quasi-base.
