proposition: Lemma Sch_rcons l w : Sch (rcons w l) = ins (Sch w) l.
proof: Proof. Proof using. by rewrite /Sch rev_rcons. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(perm fingroup) tools partition Yamanouchi ordtype subseq tableau std stdtab