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。
This paper give the proofs of the Keal Function "a theorem that sum aggregate enumerable set is countable aggregate".
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.
在前期工作的基础上，提出一个实数集（连续统）可数性的一个更严格、更直观的证明。
This paper gives a new proof of continuum's countability which is more strict and di-rectviewing on the basis of the earlier work.
在前期工作的基础上，提出一个实数集（连续统）可数性的一个更严格、更直观的证明。
This paper gives a new proof of continuum's countability which is more strict and di-rectviewing on the basis of the earlier work.
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