proposition: Fact polX_XY_is_multiplicative : multiplicative polX_XY.
proof: Proof. by rewrite /polX_XY; split; [exact: rmorphM | exact: rmorph1]. 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