proposition: Lemma omega_homsymp la : (head 0%N la <= n)%N -> omegahomsym 'hp[la] = (-1) ^+ (d - size la) *: 'hp[la].
proof: Proof. Proof using. by move=> Hd; apply val_inj; rewrite /= omegasf_prodsymp. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg matrix vector ssrnum algC archimedean) mathcomp(fingroup perm) mathcomp(ssrcomplements freeg mpoly) tools sorted ordtype permuted partition permcent antisym Schur_mpoly Schur_altdef sympoly