proposition: Lemma qpoly_mul_addr : right_distributive (@qpoly_mul A h) +%R.
proof: Proof. have rPM := monic_mk_monic h; move=> p q r; apply: val_inj. by rewrite /= !(mulrDr, rmodp_mulmr, rmodpD). 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)