# Catalan's identity

> mathematical identity, generalizing Cassini's: F_n^2 - F_{n - r}F_{n + r} = (-1)^{n - r}F_r^2

**Wikidata**: [Q118220479](https://www.wikidata.org/wiki/Q118220479)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Catalan's_identity)  
**Source**: https://4ort.xyz/entity/catalan-s-identity