proposition: Lemma derG1P G : reflect (G^`(1) = 1) (abelian G).
proof: Proof. exact: commG1P. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat fintype) mathcomp(bigop finset binomial fingroup morphism) mathcomp(automorphism quotient gfunctor)