proposition: Lemma eval_vec_mx e m n (u : 'rV_(m * n)) : eval_mx e (vec_mx u) = vec_mx (eval_mx e u).
proof: Proof. by apply/matrixP=> i j; rewrite !mxE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(div fintype tuple finfun bigop fingroup perm) mathcomp(ssralg zmodp matrix mxalgebra poly polydiv)