proposition: Lemma ltom_wf : @well_founded 'X_{1..n} <%O.
proof: Proof. by apply: ltmwf=> m1 IH; apply: Acc_intro => m2 /IH. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg