fact: Hypothesis Hanti : forall d : nat, d != 0%N -> \sum_(0 <= i < d.+1) (-1) ^+ i *: (H i * E (d - i)) = 0.
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