proposition: Lemma cnvar_prodsymp (la : 'P_d) : cnvarsym 'p[la] = 'p[la].
proof: Proof. rewrite /prod_symp; apply (@cnvar_prodgen (symp^~ R)); last by []. by move=> i Hi; apply: cnvar_symp. 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