---
tag: 09NWETVTNY
kind: concept
name: Injective function
aliases: [injection, one-to-one-function]
msc: ["03E20"]
sources:
  - url: https://en.wikipedia.org/wiki/Injective_function
    locator: lead section
same_as:
  wikidata: Q182003
  wikipedia: Injective function
---

## Summary

A function is injective when different inputs always give different values.