Set C is sub set of A * B. Thus we say that a relation R from set A to set B is a subset of the Cartesian product A × B
Second element is called image of first element. E. g.“ Amit” is image of“ a”.
Domain: The set of all first elements of the ordered pairs in a relation. Eg: a & b not c are domain
Range: The set of all second elements in a relation R. E. g. Amit, Bittu and Bholi are range but“ Don” is not part of range.
Codomain: Whole set B. Note that range ⊆ codomain. E. g.: Amit, Bittu Bholi and Don are part of codomain.
A relation may be represented by: o
Roster form o Set-builder method. o
An arrow diagram