X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fgrammar%2Faarity.ma;h=7f44246c7bde31c709c73a12f6e770df1d76c5a6;hb=e92beef4185d9c11884bcdb123429b1e7138e40c;hp=96dec98ba281f3402698c85d48b1f11fcb6888d0;hpb=6acee1cf296163fee832b112c96b6624253aee06;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/grammar/aarity.ma b/matita/matita/contribs/lambdadelta/basic_2/grammar/aarity.ma
index 96dec98ba..7f44246c7 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/grammar/aarity.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/grammar/aarity.ma
@@ -39,7 +39,7 @@ fact destruct_apair_apair_aux: ∀A1,A2,B1,B2. ②B1.A1 = ②B2.A2 → B1 = B2 
 #A1 #A2 #B1 #B2 #H destruct /2 width=1 by conj/
 qed-.
 
-lemma discr_apair_xy_x: ∀A,B. ②B. A = B → ⊥.
+lemma discr_apair_xy_x: ∀A,B. ②B.A = B → ⊥.
 #A #B elim B -B
 [ #H destruct
 | #Y #X #IHY #_ #H elim (destruct_apair_apair_aux … H) -H /2 width=1 by/ (**) (* destruct lemma needed *)