Definition of

Intersection (sets)

intersection of two sets
The intersection of two sets has only the elements common to both sets.

If an element is in just one set it is not part of the intersection.

The symbol is an upside down U like this:

Example: The intersection of the "Soccer" and "Tennis" sets is just casey and drew (only casey and drew are in both sets), which can be written:

Soccer ∩ Tennis = {casey, drew}

Try asking each person "do you go to Soccer and also Tennis?
See: Union

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