fact: Definition Lt' (p1 p2 : problem) := match p1, p2 with | None, Some _ => True | Some (_, l1), Some (_, l2) => Lt l1 l2 | _, _ => False end.
imports: Coq(Relations Wellfounded) CoLoR(ASubstitution ATerm EqUtil ListUtil LogicUtil VecUtil AVariables BoolUtil NatUtil SN AVariables Lexico)