proposition: Lemma conjg_eq1 x y : (x ^ y == 1) = (x == 1).
proof: Proof. by rewrite (canF_eq (conjgK _)) conj1g. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)