-lemma cnx_inv_abbr_pos (h) (G) (L):
- ∀V,T. ❪G,L❫ ⊢ ⬈𝐍[h] +ⓓV.T → ⊥.
-#h #G #L #V #U1 #H
-elim (cpx_subst h G (L.ⓓV) U1 … 0) [|*: /2 width=4 by drops_refl/ ] #U2 #T2 #HU12 #HTU2
+lemma cnx_inv_abbr_pos (G) (L):
+ ∀V,T. ❪G,L❫ ⊢ ⬈𝐍 +ⓓV.T → ⊥.
+#G #L #V #U1 #H
+elim (cpx_subst G (L.ⓓV) U1 … 0) [|*: /2 width=4 by drops_refl/ ] #U2 #T2 #HU12 #HTU2