---
tag: 01AHG4G9RT
kind: concept
name: Preimage of a set
aliases: [inverse-image]
msc: ["03E20"]
sources:
  - url: https://en.wikipedia.org/wiki/Image_(mathematics)
    locator: Inverse image
---

## Summary

The preimage of a set under a function is the set of all inputs whose value is in that set.