# Cassini's identity

> mathematical identity: F_{n - 1}F_{n + 1} - F_n^2 = (-1)^n

**Wikidata**: [Q123169377](https://www.wikidata.org/wiki/Q123169377)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Cassini's_identity)  
**Source**: https://4ort.xyz/entity/cassini-s-identity