FUNCTIONS

It is a special type of relation.

Defn: A relation R:AàB is said to be a function if every element of a set A has only one image in set B.

Or

A relation R:AàB is said to be a function if Domain(R)=A and One many relation is not present.

Or

A special relationship where each input has a single output. It is often written as "f(x)" where x is the input value.

Example:

Different types of functions their domain and range