proposition: Lemma map_mx1 : 1%:M^f = 1%:M :> 'M_n.
proof: Proof. by rewrite map_scalar_mx rmorph1. 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)