---
tag: 0EPAT51DXQ
kind: concept
name: Function
aliases: [map, mapping]
msc: ["03E20"]
sources:
  - url: https://en.wikipedia.org/wiki/Function_(mathematics)
    locator: lead section
same_as:
  wikidata: Q11348
  wikipedia: Function (mathematics)
---

## Summary

A function from a set $A$ to a set $B$ assigns to each element of $A$ exactly one element of $B$.