proposition: Lemma perm_commword (u v : seq 'I_n) : perm_eq u v -> commword u = commword v.
proof: Proof. Proof using . exact: perm_big. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssralg) mathcomp(ssrcomplements freeg mpoly) tools ordtype partition Yamanouchi std tableau stdtab Schensted congr plactic stdplact Yam_plact Greene_inv shuffle Schur_mpoly