Frenet formula
preferred label: فرمول فرنه @fa
type: Concept
related: Darboux formula

third curvature
preferred label: خمیدگی سوم @fa
type: Concept
related: Darboux formula

Darboux formula
related: third curvature
related: Frenet formula
related: principal curve
broader: Euler-Maclaurin summation formula
preferred label: فرمول داربو @fa
type: Concept

principal curve
preferred label: خم اصلی @fa
type: Concept
related: Darboux formula

Euler-Maclaurin summation formula
preferred label: فرمول مجموع یابی اویلر-مکلورن @fa
type: Concept
narrower: Darboux formula