proposition: Fact scale_polXYDl p c1 c2 : (c1 + c2) *:M p = c1 *:M p + c2 *:M p.
proof: Proof. by rewrite /polXY_scale rmorphD /= scalerDl. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssrint rat ssralg ssrnum algC matrix vector) mathcomp(mpoly) tools partition ordtype antisym Schur_mpoly Schur_altdef sympoly homogsym permcent