proposition: Lemma symp0 : 'p_0 = n%:R.
proof: Proof. Proof using. apply /val_inj; rewrite /= /symp_pol. under eq_bigr do rewrite expr0. by rewrite sumr_const card_ord /= raddfMn. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg ssrint fingroup perm) mathcomp(ssrcomplements freeg mpoly) sorted tools ordtype permuted partition skewpart composition Yamanouchi std tableau stdtab skewtab permcent antisym Schur_mpoly therule Schur_altdef unitriginv