Function

Function

Function is generally defined as 

' If each and all element of set A is connected with the unique elements of set B i.e  not to more than one then it is a function. In a function it is not compulsory that all elements of set B are connected; we call this relation as function.'

One to one function

A function from A to B is said to be a one to one function if different elements of set A are mapped with different elements of set B i.e. no any two elements of Set A are mapped with the single element of Set B.

Bijective Function

A function from A to B is said to be a bijective function if the function is one to one and also onto function.