# Functions¶

## Bijective¶

A function that is both surjective and injective.

## Codomain¶

## Continuous¶

## Domain¶

The set of points the function is defined for.

## Image¶

## Injective¶

A function is injective if it never maps two different inputs to the same output.

See also: surjective, bijective

## Monotonic¶

A function is monotonic if it is non-decreasing or non-increasing.

## Surjective¶

A function is surjective if, for every possible output, there is one input that produces that output.

See also: injective, bijective