proposition: Lemma qisom_inj : injective qisom.
proof: Proof. by move=> x y; apply: (injmP injm_qisom); rewrite inE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq div) mathcomp(choice fintype prime finset fingroup morphism) mathcomp(automorphism)