proposition: Fact co_hpXY_is_additive la mu : additive (co_hpXY la mu).
proof: Proof. by rewrite /co_hpXY; unlock => p q; rewrite raddfB. 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