proposition: Lemma map_symp d : map_sympoly 'p_d = 'p_d.
proof: Proof. apply val_inj; rewrite /= /symp_pol rmorph_sum /=. by apply eq_bigr => X _; rewrite rmorphXn /= map_mpolyX. 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