# Grzegorczyk hierarchy

> hierarchy of primitive recursive functions used in computability theory

**Wikidata**: [Q5612503](https://www.wikidata.org/wiki/Q5612503)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Grzegorczyk_hierarchy)  
**Source**: https://4ort.xyz/entity/grzegorczyk-hierarchy