proposition: Lemma symh_symeE (d : nat) : d != 0%N -> 'h_d = \sum_(1 <= i < d.+1) 'e_i * ((-1) ^+ i.-1 *: 'h_(d - i)) :> SF.
proof: Proof. by apply: (symHE_rec (syme0 _ _)); exact: sum_syme_symh. 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