proposition: Lemma prod_gen_colpartn d : 'g[colpartn d] = 'g_1 ^+ d.
proof: Proof. rewrite /prod_gen /= colpartnE big_nseq. by elim: d => //= d ->; rewrite exprS. 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