RELATION: Relation between two sets is a rule which associates the elements or element of one set to the elements or element of the other.
If R : A ---> B is a relation from the set A to the set B such that A and B are two non-empty sets, A is said to be domain of the relation R and B is called co-domain of R.
For example A and B are two families such that three members of the family A ; x, y, z are friends of the members of family B; a , b , c respectively, then the relation " is friend of " is a relation which associates x,y, z of set A with a, b , c of the set B.
Thus here the family A is domain and the family B is co-domain and the relation is defined as
R = is friend of .
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