摘要
讨论了拟第一可数空间和弱拟第一可数空间的遗传性和可积性,给出了一些反例来说明这两类空间在某些拓扑运算下的不封闭性,同时研究了它们具有遗传性和可积性的充要条件.
It is discussed in this paper the hereditary properties and productive properties of quasi and weakly quasi-first-countable spaces. Some counter-examples are given to show that quasi and weakly quasi-first-countable spaces are not closed under certain topological operators. Also the sufficient and necessary conditions of the hereditary properties and productive properties of the two spaces are given.
出处
《高校应用数学学报(A辑)》
CSCD
北大核心
2010年第2期224-228,共5页
Applied Mathematics A Journal of Chinese Universities(Ser.A)
基金
国家自然科学基金(10971185)
中国博士后科学基金(20090461093)
江苏省博士后科研资助计划项目(0902064C)
关键词
拟第一可数空间
弱拟第一可数空间
遗传性
可积性
quasi-first-countable spaces
weakly quasi-first-countable spaces
hereditary properties
productive properties