fact: Definition int_red_pos_at (R : rules) i t u := exists f (h : i < arity f) ts, t = Fun f ts /\ exists v, red R (Vnth ts h) v /\ u = Fun f (Vreplace ts h v).
imports: CoLoR(ARelation ListNodup LogicUtil VecUtil RelUtil ListUtil SN BoolUtil EqUtil NatUtil ListMax VecOrd) Coq(Morphisms)