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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_fqus.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_fqus.ma
index 2c4c56027..6cb594494 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_fqus.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_fqus.ma
@@ -20,8 +20,8 @@ include "basic_2/rt_computation/csx_lsubr.ma".
 (* Properties with extended supclosure **************************************)
 
 lemma csx_fqu_conf (b):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂[b] ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ ⬈*𝐒 T1 → ❪G2,L2❫ ⊢ ⬈*𝐒 T2.
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂[b] ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ ⬈*𝐒 T1 → ❨G2,L2❩ ⊢ ⬈*𝐒 T2.
 #b #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
 [ /3 width=5 by csx_inv_lref_pair_drops, drops_refl/
 | /2 width=3 by csx_fwd_pair_sn/
@@ -33,22 +33,22 @@ lemma csx_fqu_conf (b):
 qed-.
 
 lemma csx_fquq_conf (b):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂⸮[b] ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ ⬈*𝐒 T1 → ❪G2,L2❫ ⊢ ⬈*𝐒 T2.
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂⸮[b] ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ ⬈*𝐒 T1 → ❨G2,L2❩ ⊢ ⬈*𝐒 T2.
 #b #G1 #G2 #L1 #L2 #T1 #T2 * /2 width=6 by csx_fqu_conf/
 * #HG #HL #HT destruct //
 qed-.
 
 lemma csx_fqup_conf (b):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂+[b] ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ ⬈*𝐒 T1 → ❪G2,L2❫ ⊢ ⬈*𝐒 T2.
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂+[b] ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ ⬈*𝐒 T1 → ❨G2,L2❩ ⊢ ⬈*𝐒 T2.
 #b #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqup_ind … H) -G2 -L2 -T2
 /3 width=6 by csx_fqu_conf/
 qed-.
 
 lemma csx_fqus_conf (b):
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂*[b] ❪G2,L2,T2❫ →
-      ❪G1,L1❫ ⊢ ⬈*𝐒 T1 → ❪G2,L2❫ ⊢ ⬈*𝐒 T2.
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂*[b] ❨G2,L2,T2❩ →
+      ❨G1,L1❩ ⊢ ⬈*𝐒 T1 → ❨G2,L2❩ ⊢ ⬈*𝐒 T2.
 #b #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqus_ind … H) -H
 /3 width=6 by csx_fquq_conf/
 qed-.