# algebraic stack

> stack in groupoids over the étale site of schemes such that the diagonal map is representable and that there exists a smooth surjection from a scheme

**Wikidata**: [Q1687845](https://www.wikidata.org/wiki/Q1687845)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Algebraic_stack)  
**Source**: https://4ort.xyz/entity/algebraic-stack