X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fstatic_2%2Fstatic%2Flsubf_frees.ma;h=de32a2f006af60383aa4c1c062b612c6c942441b;hp=963893a24aef7195bd4b776d563423921d3578b7;hb=bd53c4e895203eb049e75434f638f26b5a161a2b;hpb=3b7b8afcb429a60d716d5226a5b6ab0d003228b1

diff --git a/matita/matita/contribs/lambdadelta/static_2/static/lsubf_frees.ma b/matita/matita/contribs/lambdadelta/static_2/static/lsubf_frees.ma
index 963893a24..de32a2f00 100644
--- a/matita/matita/contribs/lambdadelta/static_2/static/lsubf_frees.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/static/lsubf_frees.ma
@@ -19,8 +19,8 @@ include "static_2/static/lsubf.ma".
 (* Properties with context-sensitive free variables *************************)
 
 lemma lsubf_frees_trans:
-      ∀f2,L2,T. L2 ⊢ 𝐅+⦃T⦄ ≘ f2 →
-      ∀f1,L1. ⦃L1,f1⦄ ⫃𝐅+ ⦃L2,f2⦄ → L1 ⊢ 𝐅+⦃T⦄ ≘ f1.
+      ∀f2,L2,T. L2 ⊢ 𝐅+❪T❫ ≘ f2 →
+      ∀f1,L1. ❪L1,f1❫ ⫃𝐅+ ❪L2,f2❫ → L1 ⊢ 𝐅+❪T❫ ≘ f1.
 #f2 #L2 #T #H elim H -f2 -L2 -T
 [ /3 width=5 by lsubf_fwd_isid_dx, frees_sort/
 | #f2 #i #Hf2 #g1 #Y1 #H