... 可数集 denumerable set 可数集（合） denumerable aggregate 可数加性的 denumerably additive ...
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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.
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。
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