fact: Definition inner_int_red u v := exists l r c s, c <> Hole /\ In (mkRule l r) R /\ u = fill c (sub s l) /\ v = fill c (sub s r) /\ innermost (sub s l).
imports: CoLoR(ARelation ListNodup LogicUtil VecUtil RelUtil ListUtil SN BoolUtil EqUtil NatUtil ListMax VecOrd) Coq(Morphisms)