# Bijective Functions

Learn about bijective functions.

## Bijective functions

If a function is both injective and surjective, it is called a** **bijective function— also called a one-to-one correspondence or simply a correspondence. In a **bijective function**, every element of the domain maps to a unique element of the codomain, and every element in the codomain has a preimage. This means a bijective function pairs up all the domain and codomain elements.

### Examples

Take the following sets:

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