fact: Hypotheses (defG : K * U = G) (nsKG : K <| G).
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq div fintype finset) mathcomp(prime fingroup morphism automorphism quotient gproduct gfunctor) mathcomp(cyclic center commutator pgroup nilpotent sylow abelian hall) mathcomp(maximal) odd_order(BGsection1 BGappendixAB)