fact: Variables (gT : finGroupType) (p : nat) (A : {set gT}).
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrbool ssrfun eqtype ssrnat seq div) mathcomp(fintype finset prime fingroup morphism perm automorphism action) mathcomp(quotient cyclic gfunctor pgroup gproduct center commutator) mathcomp(gseries nilpotent sylow abelian maximal hall) odd_order(BGsection1 BGsection4)