---
tag: 0PSKT5W817
kind: concept
name: Identity function
aliases: [identity-map]
msc: ["03E20"]
sources:
  - url: https://en.wikipedia.org/wiki/Identity_function
    locator: lead section
same_as:
  wikidata: Q321119
  wikipedia: Identity function
---

## Summary

The identity function of a set sends each element to itself.