-definition d_liftable1: relation2 lenv term → predicate bool ≝
- λR,b. ∀f,L,K. ⬇*[b, f] L ≡ K →
- ∀T,U. ⬆*[f] T ≡ U → R K T → R L U.
+definition d_liftable1: predicate (relation2 lenv term) ≝
+ λR. ∀K,T. R K T → ∀b,f,L. ⬇*[b, f] L ≡ K →
+ ∀U. ⬆*[f] T ≡ U → R L U.