X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Freduction%2Fcir.ma;h=576633954bd138547b93255e7853daeb456eb579;hb=43282d3750af8831c8100c60d75c56fdfb7ff3c9;hp=b315e29bc0fc6a8fc01454ffa268b990d142d592;hpb=6c985e4e2e7846a2b9abd0c84569f21c24e9ce2f;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/reduction/cir.ma b/matita/matita/contribs/lambdadelta/basic_2/reduction/cir.ma
index b315e29bc..576633954 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/reduction/cir.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/reduction/cir.ma
@@ -24,7 +24,7 @@ interpretation "irreducibility for context-sensitive reduction (term)"
 
 (* Basic inversion lemmas ***************************************************)
 
-lemma cir_inv_delta: ∀G,L,K,V,i. ⇩[i] L ≡ K.ⓓV → ⦃G, L⦄ ⊢ ➡ 𝐈⦃#i⦄ → ⊥.
+lemma cir_inv_delta: ∀G,L,K,V,i. ⬇[i] L ≡ K.ⓓV → ⦃G, L⦄ ⊢ ➡ 𝐈⦃#i⦄ → ⊥.
 /3 width=3 by crr_delta/ qed-.
 
 lemma cir_inv_ri2: ∀I,G,L,V,T. ri2 I → ⦃G, L⦄ ⊢ ➡ 𝐈⦃②{I}V.T⦄ → ⊥.