## intersection

intersection
1. of sets. The set that results from combining elements common to two sets S and T, say, usually expressed as ST

∩ is regarded as an operation on sets, the intersection operation, which is commutative and associative. Symbolically ST = {x | xS and xT}

When two sets S and T intersect in the empty set, the sets are disjoint. Since the intersection operation is associative, it can be extended to deal with the intersection of several sets.

2. of two graphs, G1 and G2. The graph that has as vertices those vertices common to G1 and G2 and as edges those edges common to G1 and G2.

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## intersection

in·ter·sec·tion / ˌintərˈsekshən/ • n. a point or line common to lines or surfaces that intersect: the intersection of a plane and a cone. ∎  a point at which two or more things intersect, esp. roads: red and green lights at the nearby intersection. ∎  an action of intersecting: his course is on a direct intersection with ours. DERIVATIVES: in·ter·sec·tion·al / -shənl/ adj.

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## intersection

intersection Point, or locus of points, common to two or more geometrical figures. Two non-parallel lines in the same plane meet in a point; two non-parallel planes meet in a line.

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## intersection

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