∩

(thing) by Orange Julius Sat Jul 08 2000 at 16:35:56
Intersection. Given two sets A and B, A ∩ B is the set of all elements of A that are also elements of B. If there are no common members between A and B, A ∩ B consists of the empty set. A rather simplistic example of intersection:

A = { 1, 2, 3, 5 }
B = { 1, 2, 3, 4 }
A ∩ B = {1, 2, 3}

∩ is written in HTML as ∩
See also: ∪

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