proposition: Lemma cnvar_prodsyme (la : 'P_d) : cnvarsym 'e[la] = 'e[la].
proof: Proof. rewrite /prod_syme; apply (@cnvar_prodgen (syme^~ R)); last by []. by move=> i Hi; apply: cnvar_syme. 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