sigma-ring
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In mathematics, a nonempty collection of sets is called a -ring (pronounced sigma-ring) if it is closed under countable union and relative complementation.
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Encyclopedic overview
6 sectionsContents
- Formal definition
- Properties
- Similar concepts
- Uses
- See also
- References
In mathematics, a nonempty collection of sets is called a -ring (pronounced sigma-ring) if it is closed under countable union and relative complementation.
== Formal definition ==
Excerpted from Wikipedia’s “sigma-ring” article, available under the CC BY-SA 4.0 licence.