Implicit Types (x : gT) (A B : {set gT}) (pi : nat_pred) (p n : nat).Notation "''Mho^' n ( G )" := (Mho n G)
  (at level 8, n at level 2, format "''Mho^' n ( G )") : group_scope.Notation "''Mho^' n ( G )" := (Mho_group n G) : Group_scope.Implicit Types (p : nat) (G H K E : {group gT}).Implicit Types E G K H : {group gT}.

Lemma exponent_gt0 G : 0 < exponent G.