proposition: Lemma qpoly_mul1z : left_id qpoly1 qpoly_mul.
proof: Proof. by move=> x; apply: val_inj; rewrite /= mul1r rmodp_small // size_mk_monic. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice fintype tuple) mathcomp(bigop binomial finset finfun ssralg countalg finalg poly polydiv) mathcomp(perm fingroup matrix mxalgebra mxpoly vector countalg)