Range

Definition

The range of a function may refer to either of two closely related concepts:

• The codomain of the function

• The image of the function

The above graphic shows a function $f$ from $X$ to $Y$. The blue oval $Y$ is the codomain of $f$. The red oval $X$ is the domain of $f$. The blue oval $Y$ is the codomain of $f$. The yellow oval inside $Y$ is the image of $f$.