可数S－闭空间及可数仿S－闭空间

Countably S-Closed Spaces and Countably Para-S-Closed Spaces

引入可数Ｓ－闭空间和可数仿Ｓ－闭空间的概念，研究了它们的一些性质，在Ｐ型空间中讨论了它们与极不连通空间、可数紧空间、可数仿紧空间的关系，得出一些新结果。

The countably S-closed spaces and countably para-S-closed spaces are introduced in this paper.By discussing some preperties of these spaces and relations of these spaces to extramally disconnected spaces, countably compact spaces and countably paracompact spaces in spaces,some new results are obtained.