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diff --git a/matita/matita/contribs/lambdadelta/static_2/static/lsubf_lsubr.ma b/matita/matita/contribs/lambdadelta/static_2/static/lsubf_lsubr.ma
index 3d4448a68..0ad58737d 100644
--- a/matita/matita/contribs/lambdadelta/static_2/static/lsubf_lsubr.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/static/lsubf_lsubr.ma
@@ -20,7 +20,7 @@ include "static_2/static/lsubf_lsubf.ma".
 (* Forward lemmas with restricted refinement for local environments *********)
 
 lemma lsubf_fwd_lsubr_isdiv:
-      ∀f1,f2,L1,L2. ❪L1,f1❫ ⫃𝐅+ ❪L2,f2❫ → 𝛀❪f1❫ → 𝛀❪f2❫ → L1 ⫃ L2.
+      ∀f1,f2,L1,L2. ❨L1,f1❩ ⫃𝐅+ ❨L2,f2❩ → 𝛀❨f1❩ → 𝛀❨f2❩ → L1 ⫃ L2.
 #f1 #f2 #L1 #L2 #H elim H -f1 -f2 -L1 -L2
 /4 width=3 by lsubr_bind, pr_isd_inv_next/
 [ #f1 #f2 #I1 #I2 #L1 #L2 #_ #_ #H
@@ -33,7 +33,7 @@ qed-.
 (* Properties with restricted refinement for local environments *************)
 
 lemma lsubr_lsubf_isid:
-      ∀L1,L2. L1 ⫃ L2 → ∀f1,f2. 𝐈❪f1❫ → 𝐈❪f2❫ → ❪L1,f1❫ ⫃𝐅+ ❪L2,f2❫.
+      ∀L1,L2. L1 ⫃ L2 → ∀f1,f2. 𝐈❨f1❩ → 𝐈❨f2❩ → ❨L1,f1❩ ⫃𝐅+ ❨L2,f2❩.
 #L1 #L2 #H elim H -L1 -L2
 [ /3 width=1 by lsubf_atom, pr_isi_inv_eq_repl/
 | #I #L1 #L2 | #L1 #L2 #V #W | #I1 #I2 #L1 #L2 #V
@@ -45,8 +45,8 @@ elim (pr_isi_inv_gen … Hf2) -Hf2 #g2 #Hg2 #H destruct
 qed.
 
 lemma lsubr_lsubf:
-      ∀f2,L2,T. L2 ⊢ 𝐅+❪T❫ ≘ f2 → ∀L1. L1 ⫃ L2 →
-      ∀f1. L1 ⊢ 𝐅+❪T❫ ≘ f1 → ❪L1,f1❫ ⫃𝐅+ ❪L2,f2❫.
+      ∀f2,L2,T. L2 ⊢ 𝐅+❨T❩ ≘ f2 → ∀L1. L1 ⫃ L2 →
+      ∀f1. L1 ⊢ 𝐅+❨T❩ ≘ f1 → ❨L1,f1❩ ⫃𝐅+ ❨L2,f2❩.
 #f2 #L2 #T #H elim H -f2 -L2 -T
 [ #f2 #L2 #s #Hf2 #L1 #HL12 #f1 #Hf1
   lapply (frees_inv_sort … Hf1) -Hf1 /2 width=1 by lsubr_lsubf_isid/