- exclusion binder in local environments:

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / rt_transition / cnx_drops.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_drops.ma
index 21a642e5aa1533dbc1183f5f76cb0a3a55f105f0..4289cde87cf8d4cbc79938ba62ff88292d8b8442 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_drops.ma
@@ -25,6 +25,11 @@ lemma cnx_lref_atom: ∀h,o,G,L,i. ⬇*[i] L ≡ ⋆ → ⦃G, L⦄ ⊢ ⬈[h, o
 #I #K #V1 #V2 #HLK lapply (drops_mono … Hi … HLK) -L #H destruct
 qed.
 
+lemma cnx_lref_unit: ∀h,o,I,G,L,K,i. ⬇*[i] L ≡ K.ⓤ{I} → ⦃G, L⦄ ⊢ ⬈[h, o] 𝐍⦃#i⦄.
+#h #o #I #G #L #K #i #HLK #X #H elim (cpx_inv_lref1_drops … H) -H // *
+#Z #Y #V1 #V2 #HLY lapply (drops_mono … HLK … HLY) -L #H destruct
+qed.
+
 (* Basic_2A1: includes: cnx_lift *)
 lemma cnx_lifts: ∀h,o,G. d_liftable1 … (cnx h o G).
 #h #o #G #K #T #HT #b #f #L #HLK #U #HTU #U0 #H