The intersection of two or more mathematical objects is the set of all points that are common to all of them.
In set theory, that would be the elements in common. In geometry, it would be the set of all points in common. For example, the intersection of two different planes is a line; the intersection of a plane and a cone are the conic sections: circle, ellipse, parabola and hyperbola.
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The point of intersection of x and y.
Crossing, the same meaning that it has generally.
The basic operations are union, intersection and complement.
An intersection is where two lines cross each other: X is an example.
The main set operations are: union, intersection and complement.