Hint Resolve group1 group1_class1 group1_class12 group1_class12 : core.
Hint Resolve group1_eqType group1_finType : core.
Hint Resolve cardG_gt0 cardG_gt0_reduced indexg_gt0 : core.
Notation "G :^ x" := (conjG_group G x) : Group_scope.
Notation "[ 'subg' G ]" := (subg_of G) : type_scope.
Notation "[ 'subg' G ]" := [set: subg_of G] : group_scope.
Notation "[ 'subg' G ]" := [set: subg_of G]%G : Group_scope.
Prenex Implicits subg sgval subg_of.
Bind Scope group_scope with subg_of.
Arguments subgK {gT G}.
Arguments sgvalK {gT G}.
Arguments subg_inj {gT G} [u1 u2] eq_u12 : rename.
Arguments trivgP {gT G}.
Arguments trivGP {gT G}.
Arguments lcoset_eqP {gT G x y}.
Arguments rcoset_eqP {gT G x y}.
Arguments mulGidPl [gT G H].
Arguments mulGidPr [gT G H].
Arguments comm_group_setP {gT G H}.
Arguments class_eqP {gT G x y}.
Arguments repr_classesP {gT G xG}.
Section GroupInter.
Variable gT : finGroupType.
Implicit Types A B : {set gT}.
Implicit Types G H : {group gT}.

(* Specifications: *)
Lemma group_setI G H : group_set (G :&: H).
Canonical setI_group G H := group (group_setI G H).