# Whitehead problem

> the problem of whether an abelian group 𝐴 satisfying Ext¹(𝐴,ℤ)=0 is necessarily free, now known to be independent of ZFC

**Wikidata**: [Q2905020](https://www.wikidata.org/wiki/Q2905020)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Whitehead_problem)  
**Source**: https://4ort.xyz/entity/whitehead-problem