# Lefschetz hyperplane theorem

> theorem that the inclusion between a projective variety and its hyperplane section induces isomorphisms of homology, cohomology or homotopy groups in low degrees

**Wikidata**: [Q6516731](https://www.wikidata.org/wiki/Q6516731)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lefschetz_hyperplane_theorem)  
**Source**: https://4ort.xyz/entity/lefschetz-hyperplane-theorem