# Binary relations and set projections

This English edition is an AI candidate and does not yet have an OCME Atlas (GPT-6) Twin closure receipt.

[Catalogue presentation and source-binding data](https://ocme.evemisslab.com/data/i18n/catalogue.en.json)



## [Binary relations and set projections](https://ocme.evemisslab.com/en/atlas/atlas-relation/)

A binary relation is a set of ordered pairs in a specified A×B. An input need not have a unique output or any output.

atlas-relation · canonical_mko

[Binary relations and set projections](https://ocme.evemisslab.com/en/mko/mko-relation/)

## Prerequisite nodes


- [Set membership](https://ocme.evemisslab.com/en/atlas/atlas-set-membership/)
- [Set](https://ocme.evemisslab.com/en/atlas/atlas-set/)