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Intersection (set theory)
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<p>In <a href="/facts/Set_theory/1ptfsvUP">set theory</a>, the intersection of two <a href="/facts/Set_(mathematics)/BfucfHMq">sets</a> A {\displaystyle A} and B , {\displaystyle B,} denoted by A ∩ B , {\displaystyle A\cap B,} is the set containing all elements of A {\displaystyle A} that also belong to B {\displaystyle B} or equivalently, all elements of B {\displaystyle B} that also belong to A . {\displaystyle A.} </p>