Axiom:Ring of Sets Axioms/Axioms 2
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Definition
Let $\RR$ be a system of sets.
$\RR$ is a ring of sets if and only if $\RR$ satisfies the following axioms:
\((\text {RS} 1_2)\) | $:$ | Empty Set: | \(\ds \O \in \RR \) | ||||||
\((\text {RS} 2_2)\) | $:$ | Closure under Set Difference: | \(\ds \forall A, B \in \RR:\) | \(\ds A \setminus B \in \RR \) | |||||
\((\text {RS} 3_2)\) | $:$ | Closure under Union: | \(\ds \forall A, B \in \RR:\) | \(\ds A \cup B \in \RR \) |
These criteria are called the ring of sets axioms.