# Derivation

![](https://1205508290-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGOJv2Locm6v5eywwSeaG%2Fuploads%2FERlMA4WRWUgAUfc7HzkV%2FPDA%20Relationship.png?alt=media\&token=7cebb7cd-24de-409d-9c15-ff03fe344a45)