# Lagrange reversion theorem

> Gives power series for certain implictly defined functions

**Wikidata**: [Q6402928](https://www.wikidata.org/wiki/Q6402928)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lagrange_reversion_theorem)  
**Source**: https://4ort.xyz/entity/lagrange-reversion-theorem