This paper give the proofs of the Keal Function "a theorem that sum aggregate enumerable set is countable aggregate".
主要讨论了《实变函数论》中定理：“可数个可数集之并是可数集”的多种证明。
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.
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。
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