X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambda_delta%2Fbasic_2%2Freducibility%2Ftnf.ma;h=6f6d99096942fbef746c84665aea4204504cee06;hb=78d4844bcccb3deb58a3179151c3045298782b18;hp=a5f2e4407244d3da44251d1c29abc2bf29d5d36b;hpb=a8c166f1e1baeeae04553058bd179420ada8bbe7;p=helm.git

diff --git a/matita/matita/contribs/lambda_delta/basic_2/reducibility/tnf.ma b/matita/matita/contribs/lambda_delta/basic_2/reducibility/tnf.ma
index a5f2e4407..6f6d99096 100644
--- a/matita/matita/contribs/lambda_delta/basic_2/reducibility/tnf.ma
+++ b/matita/matita/contribs/lambda_delta/basic_2/reducibility/tnf.ma
@@ -42,7 +42,7 @@ lemma tnf_inv_appl: ∀V,T. 𝐍[ⓐV.T] → ∧∧ 𝐍[V] & 𝐍[T] & 𝐒[T].
 ]
 qed-.
 
-lemma tnf_inv_abbr: ∀V,T. 𝐍[ⓓV.T] → False.
+lemma tnf_inv_abbr: ∀V,T. 𝐍[ⓓV.T] → ⊥.
 #V #T #H elim (is_lift_dec T 0 1)
 [ * #U #HTU
   lapply (H U ?) -H /2 width=3/ #H destruct
@@ -53,7 +53,7 @@ lemma tnf_inv_abbr: ∀V,T. 𝐍[ⓓV.T] → False.
 ]
 qed.
 
-lemma tnf_inv_cast: ∀V,T. 𝐍[ⓣV.T] → False.
+lemma tnf_inv_cast: ∀V,T. 𝐍[ⓣV.T] → ⊥.
 #V #T #H lapply (H T ?) -H /2 width=1/ #H
-@(discr_tpair_xy_y … H)
+@discr_tpair_xy_y //
 qed-.