proposition: Lemma map_symp_prod d (l : 'P_d) : map_sympoly 'p[l] = 'p[l].
proof: Proof. by rewrite rmorph_prod; apply eq_bigr => i _; exact: map_symp. 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