Set operators

The union (∪), intersection (∩) and set difference (−) are taught in high school and you should know them by now....

Notice that:

The result of union (∪), intersection (∩) and set difference (−) operations is also a set !!!

Specifically:

{1, 2, 3} ∩ {3, 4, 5} = {3} // {3} is a set of 1 element !!!

How set operations are used to manipulate sets of data

Example:

Students who have GPA ≥ 3.5:

A = { John, Mary, James, Kate }

Students who major in Computer Science:

B = { John, James, Kate, Larry, Terry }

Students majoring in Computer Science that has GPA ≥ 3.5:

A ∩ B = { John, James, Kate }