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The union of the sets A and B, denoted by is the set that contains those elements that are either in A or in B, or in both.
The symmetric difference of A and B, denoted by A ⊕ B, is the set containing those elements in either A or B, but not in both A and B.
The difference of B and C, denoted by , is the set containing those elements that are in B but not in C.
Cardinality denotes the total number of elements in the power set. It is denoted by |P(A)|. The cardinality of a power set for a set of elements is given by