16. Rings and sigma-rings of subsets
16.1 Subset rings
Definition (ring of sets (Birkhoff, 1937)). Let E be a non-empty set. A set ring in E is a collection of subsets of E, denoted , such that (p. 1 of , p. 86 of ):
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Rings and sigma-rings of subsets
Algebras and sigma-algebras of subsets
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