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diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fqus.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fqus.ma
index ec0549fa2..e0a3b7215 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fqus.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_fqus.ma
@@ -21,8 +21,8 @@ include "basic_2/dynamic/cnv_drops.ma".
 
 (* Basic_2A1: uses: snv_fqu_conf *)
 lemma cnv_fqu_conf (h) (a):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂ ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ T1 ![h,a] → ❪G2,L2❫ ⊢ T2 ![h,a].
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂ ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ T1 ![h,a] → ❨G2,L2❩ ⊢ T2 ![h,a].
 #h #a #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
 [ #I1 #G1 #L1 #V1 #H
   elim (cnv_inv_zero … H) -H #I2 #L2 #V2 #HV2 #H destruct //
@@ -45,24 +45,24 @@ qed-.
 
 (* Basic_2A1: uses: snv_fquq_conf *)
 lemma cnv_fquq_conf (h) (a):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂⸮ ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ T1 ![h,a] → ❪G2,L2❫ ⊢ T2 ![h,a].
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂⸮ ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ T1 ![h,a] → ❨G2,L2❩ ⊢ T2 ![h,a].
 #h #a #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -H [|*]
 /2 width=5 by cnv_fqu_conf/
 qed-.
 
 (* Basic_2A1: uses: snv_fqup_conf *)
 lemma cnv_fqup_conf (h) (a):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂+ ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ T1 ![h,a] → ❪G2,L2❫ ⊢ T2 ![h,a].
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂+ ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ T1 ![h,a] → ❨G2,L2❩ ⊢ T2 ![h,a].
 #h #a #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqup_ind … H) -G2 -L2 -T2
 /3 width=5 by fqup_strap1, cnv_fqu_conf/
 qed-.
 
 (* Basic_2A1: uses: snv_fqus_conf *)
 lemma cnv_fqus_conf (h) (a):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂* ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ T1 ![h,a] → ❪G2,L2❫ ⊢ T2 ![h,a].
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂* ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ T1 ![h,a] → ❨G2,L2❩ ⊢ T2 ![h,a].
 #h #a #G1 #G2 #L1 #L2 #T1 #T2 #H elim (fqus_inv_fqup … H) -H [|*]
 /2 width=5 by cnv_fqup_conf/
 qed-.