proposition: Lemma qisom_isom : isom setT setT qisom.
proof: Proof. by apply/isomP; rewrite injm_qisom im_qisom. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq div) mathcomp(choice fintype prime finset fingroup morphism) mathcomp(automorphism)