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Delta-ring In mathematics, a nonempty collection of sets is called a δ-ring (pronounced ''delta-ring'') if it is closed under union, relative complementation, and countable intersection: # if # if # if for all If only the first two properties are satisfied, then is a ring but not a δ-ring. Every σ-ring is a δ-ring, but not every δ-ring is a σ-ring. δ-rings can be used instead of σ-fields in the development of measure theory if one does not wish to allow sets of infinite measure. == See also ==
*Ring of sets *Sigma field *Sigma ring
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「Delta-ring」の詳細全文を読む
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