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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_feqg.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_feqg.ma
index fca623b64..1cd93d5f7 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_feqg.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_feqg.ma
@@ -22,32 +22,32 @@ include "basic_2/rt_computation/fpbg_fpbs.ma".
 (* Basic_2A1: uses: fpbg_fleq_trans *)
 lemma fpbg_feqg_trans (S) (G) (L) (T):
       reflexive … S → symmetric … S →
-      ∀G1,L1,T1. ❪G1,L1,T1❫ > ❪G,L,T❫ →
-      ∀G2,L2,T2. ❪G,L,T❫ ≛[S] ❪G2,L2,T2❫ → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+      ∀G1,L1,T1. ❨G1,L1,T1❩ > ❨G,L,T❩ →
+      ∀G2,L2,T2. ❨G,L,T❩ ≛[S] ❨G2,L2,T2❩ → ❨G1,L1,T1❩ > ❨G2,L2,T2❩.
 /3 width=8 by fpbg_fpb_trans, feqg_fpb/ qed-.
 
 (* Basic_2A1: uses: fleq_fpbg_trans *)
 lemma feqg_fpbg_trans (S) (G) (L) (T):
       reflexive … S → symmetric … S →
-      ∀G1,L1,T1. ❪G1,L1,T1❫ ≛[S] ❪G,L,T❫ →
-      ∀G2,L2,T2. ❪G,L,T❫ > ❪G2,L2,T2❫ → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+      ∀G1,L1,T1. ❨G1,L1,T1❩ ≛[S] ❨G,L,T❩ →
+      ∀G2,L2,T2. ❨G,L,T❩ > ❨G2,L2,T2❩ → ❨G1,L1,T1❩ > ❨G2,L2,T2❩.
 /3 width=8 by fpb_fpbg_trans, feqg_fpb/ qed-.
 
 (* Properties with generic equivalence for terms ****************************)
 
 lemma fpbg_teqg_div (S):
       reflexive … S → symmetric … S →
-      ∀G1,G2,L1,L2,T1,T. ❪G1,L1,T1❫ > ❪G2,L2,T❫ →
-      ∀T2. T2 ≛[S] T → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+      ∀G1,G2,L1,L2,T1,T. ❨G1,L1,T1❩ > ❨G2,L2,T❩ →
+      ∀T2. T2 ≛[S] T → ❨G1,L1,T1❩ > ❨G2,L2,T2❩.
 /4 width=8 by fpbg_feqg_trans, teqg_feqg, teqg_sym/ qed-.
 
 (* Advanced inversion lemmas of parallel rst-computation on closures ********)
 
 (* Basic_2A1: was: fpbs_fpbg *)
 lemma fpbs_inv_fpbg:
-      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫ →
-      ∨∨ ❪G1,L1,T1❫ ≅ ❪G2,L2,T2❫
-       | ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+      ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ≥ ❨G2,L2,T2❩ →
+      ∨∨ ❨G1,L1,T1❩ ≅ ❨G2,L2,T2❩
+       | ❨G1,L1,T1❩ > ❨G2,L2,T2❩.
 #G1 #G2 #L1 #L2 #T1 #T2 #H
 elim (fpbs_inv_fpbc_sn … H) -H
 [ /2 width=1 by or_introl/
@@ -58,8 +58,8 @@ qed-.
 
 (* Basic_2A1: this was the definition of fpbg *)
 lemma fpbg_inv_fpbc_fpbs (G1) (G2) (L1) (L2) (T1) (T2):
-      ❪G1,L1,T1❫ > ❪G2,L2,T2❫ →
-      ∃∃G,L,T. ❪G1,L1,T1❫ ≻ ❪G,L,T❫ & ❪G,L,T❫ ≥ ❪G2,L2,T2❫.
+      ❨G1,L1,T1❩ > ❨G2,L2,T2❩ →
+      ∃∃G,L,T. ❨G1,L1,T1❩ ≻ ❨G,L,T❩ & ❨G,L,T❩ ≥ ❨G2,L2,T2❩.
 #G1 #G2 #L1 #L2 #T1 #T2 #H
 elim (fpbg_inv_gen … H) -H #G3 #L3 #T3 #G4 #L4 #T4 #H13 #H34 #H42
 elim (fpbs_inv_fpbc_sn … H13) -H13
@@ -72,9 +72,9 @@ qed-.
 (* Advanced properties of parallel rst-computation on closures **************)
 
 lemma fpbs_fpb_trans:
-      ∀F1,F2,K1,K2,T1,T2. ❪F1,K1,T1❫ ≥ ❪F2,K2,T2❫ →
-      ∀G2,L2,U2. ❪F2,K2,T2❫ ≻ ❪G2,L2,U2❫ →
-      ∃∃G1,L1,U1. ❪F1,K1,T1❫ ≻ ❪G1,L1,U1❫ & ❪G1,L1,U1❫ ≥ ❪G2,L2,U2❫.
+      ∀F1,F2,K1,K2,T1,T2. ❨F1,K1,T1❩ ≥ ❨F2,K2,T2❩ →
+      ∀G2,L2,U2. ❨F2,K2,T2❩ ≻ ❨G2,L2,U2❩ →
+      ∃∃G1,L1,U1. ❨F1,K1,T1❩ ≻ ❨G1,L1,U1❩ & ❨G1,L1,U1❩ ≥ ❨G2,L2,U2❩.
 #F1 #F2 #K1 #K2 #T1 #T2 #H elim (fpbs_inv_fpbg … H) -H
 [ #H12 #G2 #L2 #U2 #H22
   lapply (feqg_fpbc_trans … H12 … H22) -F2 -K2 -T2