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.