proposition: Lemma poly_rV_is_linear : linear poly_rV.
proof: Proof. by move=> a p q; apply/rowP=> i; rewrite !mxE coefD coefZ. 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)