proposition: Lemma FrobeniusWker : [Frobenius G with kernel K].
proof: Proof. by apply/existsP; exists H. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div) mathcomp(fintype bigop prime finset fingroup morphism) mathcomp(perm action quotient gproduct cyclic center) mathcomp(pgroup nilpotent sylow hall abelian)