Ring of sets/Definition

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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

  1. ↑ Page 19 -Measure Theory - Paul R. Halmos
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