# Hartogs number

> given a set, the least ordinal such that there is no injection from the ordinal into the set

**Wikidata**: [Q1186007](https://www.wikidata.org/wiki/Q1186007)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hartogs_number)  
**Source**: https://4ort.xyz/entity/hartogs-number


## References

1. Freebase Data Dumps. 2013