23/12/06 17:07:22.60 R4FBpWz7.net
>>593
>>>589
>集合族は集合じゃないですよ
自殺しとけ知ったかぶり忍者スタンプ
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Definition
A set of sets is a set, whose elements are themselves all sets.
Also known as
Thus you will find terms such as collection of sets, family of sets, assembly of sets - it goes on and on.