proposition: Lemma prod_gen0 (l : 'P_0) : 'g[l] = 1.
proof: Proof. by rewrite /prod_gen val_intpartn0 big_nil. 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