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