proposition: Lemma map_genmx m n (A : 'M_(m, n)) : (<<A>>^f :=: <<A^f>>)%MS.
proof: Proof. by apply/eqmxP; rewrite !(genmxE, map_submx) andbb. 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 finalg zmodp matrix)