Types of Relations

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There are four types of relations as follows:There are four types of relations as follows:

(i) one - one

(ii) many - one

(iii) one - many

(iv) many - many

(i) one - one

For each element of B there is one corresponding element of A

(ii) many - one

For an element of B there is more than one element of A.

(iii) one - many

For one element of A there is more than one corresponding element of B.

(iv) many - many

For one element of A there is more than one corresponding element of B and for one element of B there is more than one corresponding element of A.

The relation is called 'onto' if every element of B has a corresponding element of A.

For example, Figures (i) and (ii) are onto relations.

The relation is called 'into' if every element of B does not have a corresponding element of A.

For example, Figures (iii) and (iv) are into relations.