proposition: Lemma trmx1 n : (1%:M)^T = 1%:M :> 'M[R]_n.
proof: Proof. exact: tr_scalar_mx. 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)