# Bijection, injection and surjection

> Injection: one to one, surjection: onto, bijection: both one to one and onto.

**Wikidata**: [Q4907197](https://www.wikidata.org/wiki/Q4907197)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Bijection,_injection_and_surjection)  
**Source**: https://4ort.xyz/entity/bijection-injection-and-surjection


## References

1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)