X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2A%2Funfold%2Funfold.ma;h=f949f5e3927d2934ef47f2560189f3110884419b;hb=12dc655b7f5321b33b93a310d53e23e60e090caa;hp=063d9c7bb296feaca83af05198a04cc9e423df54;hpb=dd41efaab7f147d5673cc30a27d36375f9b52c9d;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2A/unfold/unfold.ma b/matita/matita/contribs/lambdadelta/basic_2A/unfold/unfold.ma
index 063d9c7bb..f949f5e39 100644
--- a/matita/matita/contribs/lambdadelta/basic_2A/unfold/unfold.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2A/unfold/unfold.ma
@@ -24,7 +24,7 @@ inductive unfold: relation4 genv lenv term lenv ≝
 | unfold_sort: ∀G,L,k. unfold G L (⋆k) L
 | unfold_lref: ∀I,G,L1,L2,K1,K2,V,i. ⬇[i] L1 ≡ K1. ⓑ{I}V →
                unfold G K1 V K2 → ⬇[Ⓣ, |L2|, i] L2 ≡ K2 →
-               unfold G L1 (#i) (L1@@L2)
+               unfold G L1 (#i) (L1;;L2)
 | unfold_bind: ∀a,I,G,L1,L2,V,T.
                unfold G (L1.ⓑ{I}V) T L2 → unfold G L1 (ⓑ{a,I}V.T) L2
 | unfold_flat: ∀I,G,L1,L2,V,T.