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Intersection

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Intersection[a, b, ...]

gives the intersection of the sets. The resulting list will be sorted and each element will only occur once.

• • Intersection[{1000, 100, 10, 1}, {1, 5, 10, 15}]

• • Intersection[{{a, b}, {x, y}}, {{x, x}, {x, y}, {x, z}}]

• • Intersection[{c, b, a}]

• • Intersection[{1, 2, 3}, {2, 3, 4}, SameTest->Less]