# inverse image

## English

### Noun

inverse image (plural inverse images)

1. The set of points that map to a given point (or set of points) under a specified function.
Under the function given by ${\displaystyle f(x)=x^{2}}$, the inverse image of 4 is ${\displaystyle \{-2,2\}}$, as is the inverse image of ${\displaystyle \{4\}}$.