perfect set
plural of pneumatic bone
(mathematical analysis) A set which is equal to its set of limit points. That is, a set A is perfect if A'=A.
(zoology) Any fish in the family Curimatidae.
plural of pancetta
カントール集合は、限点全体と一致し、どの開集合においても内部が空でありながら可算でないという古典的な例です。
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