关于可数空间

On Countable spaces

本文定义了几乎第二可数,几乎第一可数,几乎可分和几乎Lindelof空间,它们分别是第二可数,第一可数,可分和Lindelof空间的一般化,同时还讨论了这四类空间的性质。

In this paper. We introduce almost secord countable space dlmost first count-able, almost separable spaces and almost Lindelof spaces whivh are generalizations of secord countable, first countbale seoparable and Lindelof spaces, respectively. We alge study the propertise of the four rew dasses of spaces.