proposition: Lemma map_mxvec : (mxvec A)^f = mxvec A^f.
proof: Proof. by apply/rowP=> i; rewrite !(castmxE, mxE). 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)