Difference between revisions of "Ring of sets/Definition"
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Latest revision as of 17:21, 18 August 2016
Definition
A Ring of sets is a non-empty class [ilmath]R[/ilmath][1] of sets such that:
- [math]\forall A\in R\forall B\in R[A\cup B\in R][/math]
- [math]\forall A\in R\forall B\in R[A-B\in R][/math]
References
- ↑ Page 19 -Measure Theory - Paul R. Halmos
