Rings and sigma-rings of subsets
Ordered Set Theory
Quizzed article REF: AF94 V1
Rings and sigma-rings of subsets
Ordered Set Theory

Author : Jean-Charles PINOLI

Publication date: August 10, 2019, Review date: May 7, 2021 | Lire en français

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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 A , such that (p. 1 of , p. 86 of ):

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