proposition: Lemma im_qisom : qisom @* setT = setT.
proof: Proof. by rewrite -{2}im_quotient morphim_qisom eqGH im_quotient. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq div) mathcomp(choice fintype prime finset fingroup morphism) mathcomp(automorphism)