proposition: Lemma symp_cast : 'p[cast_intpartn eq_d la] = 'p[la] :> SF.
proof: Proof. exact: prod_gen_cast. 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