X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Flsubsv.ma;h=18a49d6bfee7afa8729c441373c59b16cb979c61;hb=43282d3750af8831c8100c60d75c56fdfb7ff3c9;hp=c16f87bb0bcb1706b780181397318ce882a31f4c;hpb=6c985e4e2e7846a2b9abd0c84569f21c24e9ce2f;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubsv.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubsv.ma
index c16f87bb0..18a49d6bf 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubsv.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubsv.ma
@@ -116,8 +116,8 @@ qed-.
 
 (* Note: the constant 0 cannot be generalized *)
 lemma lsubsv_drop_O1_conf: ∀h,g,G,L1,L2. G ⊢ L1 ⫃¡[h, g] L2 →
-                           ∀K1,s,e. ⇩[s, 0, e] L1 ≡ K1 →
-                           ∃∃K2. G ⊢ K1 ⫃¡[h, g] K2 & ⇩[s, 0, e] L2 ≡ K2.
+                           ∀K1,s,e. ⬇[s, 0, e] L1 ≡ K1 →
+                           ∃∃K2. G ⊢ K1 ⫃¡[h, g] K2 & ⬇[s, 0, e] L2 ≡ K2.
 #h #g #G #L1 #L2 #H elim H -L1 -L2
 [ /2 width=3 by ex2_intro/
 | #I #L1 #L2 #V #_ #IHL12 #K1 #s #e #H
@@ -139,8 +139,8 @@ qed-.
 
 (* Note: the constant 0 cannot be generalized *)
 lemma lsubsv_drop_O1_trans: ∀h,g,G,L1,L2. G ⊢ L1 ⫃¡[h, g] L2 →
-                            ∀K2,s, e. ⇩[s, 0, e] L2 ≡ K2 →
-                            ∃∃K1. G ⊢ K1 ⫃¡[h, g] K2 & ⇩[s, 0, e] L1 ≡ K1.
+                            ∀K2,s, e. ⬇[s, 0, e] L2 ≡ K2 →
+                            ∃∃K1. G ⊢ K1 ⫃¡[h, g] K2 & ⬇[s, 0, e] L1 ≡ K1.
 #h #g #G #L1 #L2 #H elim H -L1 -L2
 [ /2 width=3 by ex2_intro/
 | #I #L1 #L2 #V #_ #IHL12 #K2 #s #e #H