proposition: Lemma map_invmx n (A : 'M_n) : (invmx A)^f = invmx A^f.
proof: Proof. rewrite /invmx map_unitmx (fun_if (map_mx f)). by rewrite map_mxZ map_mx_adj det_map_mx fmorphV. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)