proposition: Lemma size_tab_stdtabn (s : stdtabn) : size_tab s = n.
proof: Proof. Proof using. by case: s => s /= /andP[_ /eqP]. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(perm fingroup) tools combclass partition Yamanouchi ordtype std tableau