# Lagrange’s theorem

Let $G$ be a finite group and let $H$ be a subgroup of $G$. Then the order of $H$ divides the order of $G$.

Title Lagrange’s theorem LagrangesTheorem 2013-03-22 12:13:03 2013-03-22 12:13:03 Evandar (27) Evandar (27) 6 Evandar (27) Theorem msc 20D99 Group ProofOfFermatsLittleTheoremUsingLagrangesTheorem ProofOfEulerFermatTheoremUsingLagrangesTheorem