把有限集中的置换推广到可数集上，引入基轮换、轮换及变换的可数次合成等概念的定义。
The permutation of the finite set is introduced into the denumerable set as well as the definition of the basic rotation, the rotation and the composition of the countability.
在具有半开集可数交性质的S-L空间中，讨论了几个S-分离性公理之间的关系。
The relations of S-separation axioms in S-L space that has countable intersection property of seim-open set were obtained.
在具有半开集可数交性质的S-L空间中，讨论了几个S-分离性公理之间的关系。
The relations of S-separation axioms in S-L space that has countable intersection property of seim-open set were obtained.
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