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Clubsuit In mathematics, and particularly in axiomatic set theory, ♣''S'' (clubsuit) is a family of combinatorial principles that are weaker version of the corresponding ◊''S''; it was introduced in 1975 . == Definition ==
For a given cardinal number and a stationary set , is the statement that there is a sequence such that * every ''A''''δ'' is a cofinal subset of ''δ'' * for every unbounded subset , there is a so that is usually written as just .
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Clubsuit」の詳細全文を読む
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