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diff --git a/matita/matita/contribs/lambdadelta/static_2/static/lsubc.ma b/matita/matita/contribs/lambdadelta/static_2/static/lsubc.ma
index 0a5f81c00..54c5d47a1 100644
--- a/matita/matita/contribs/lambdadelta/static_2/static/lsubc.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/static/lsubc.ma
@@ -22,7 +22,7 @@ include "static_2/static/gcp_cr.ma".
 inductive lsubc (RP) (G): relation lenv ≝
 | lsubc_atom: lsubc RP G (⋆) (⋆)
 | lsubc_bind: ∀I,L1,L2. lsubc RP G L1 L2 → lsubc RP G (L1.ⓘ[I]) (L2.ⓘ[I])
-| lsubc_beta: ∀L1,L2,V,W,A. ❪G,L1,V❫ ϵ ⟦A⟧[RP] → ❪G,L1,W❫ ϵ ⟦A⟧[RP] → ❪G,L2❫ ⊢ W ⁝ A →
+| lsubc_beta: ∀L1,L2,V,W,A. ❨G,L1,V❩ ϵ ⟦A⟧[RP] → ❨G,L1,W❩ ϵ ⟦A⟧[RP] → ❨G,L2❩ ⊢ W ⁝ A →
               lsubc RP G L1 L2 → lsubc RP G (L1. ⓓⓝW.V) (L2.ⓛW)
 .
 
@@ -46,7 +46,7 @@ lemma lsubc_inv_atom1: ∀RP,G,L2. G ⊢ ⋆ ⫃[RP] L2 → L2 = ⋆.
 
 fact lsubc_inv_bind1_aux: ∀RP,G,L1,L2. G ⊢ L1 ⫃[RP] L2 → ∀I,K1. L1 = K1.ⓘ[I] →
                           (∃∃K2. G ⊢ K1 ⫃[RP] K2 & L2 = K2.ⓘ[I]) ∨
-                          ∃∃K2,V,W,A. ❪G,K1,V❫ ϵ ⟦A⟧[RP] & ❪G,K1,W❫ ϵ ⟦A⟧[RP] & ❪G,K2❫ ⊢ W ⁝ A &
+                          ∃∃K2,V,W,A. ❨G,K1,V❩ ϵ ⟦A⟧[RP] & ❨G,K1,W❩ ϵ ⟦A⟧[RP] & ❨G,K2❩ ⊢ W ⁝ A &
                                       G ⊢ K1 ⫃[RP] K2 &
                                       L2 = K2. ⓛW & I = BPair Abbr (ⓝW.V).
 #RP #G #L1 #L2 * -L1 -L2
@@ -60,7 +60,7 @@ qed-.
 (* Basic_1: was: csubc_gen_head_r *)
 lemma lsubc_inv_bind1: ∀RP,I,G,K1,L2. G ⊢ K1.ⓘ[I] ⫃[RP] L2 →
                        (∃∃K2. G ⊢ K1 ⫃[RP] K2 & L2 = K2.ⓘ[I]) ∨
-                       ∃∃K2,V,W,A. ❪G,K1,V❫ ϵ ⟦A⟧[RP] & ❪G,K1,W❫ ϵ ⟦A⟧[RP] & ❪G,K2❫ ⊢ W ⁝ A &
+                       ∃∃K2,V,W,A. ❨G,K1,V❩ ϵ ⟦A⟧[RP] & ❨G,K1,W❩ ϵ ⟦A⟧[RP] & ❨G,K2❩ ⊢ W ⁝ A &
                                    G ⊢ K1 ⫃[RP] K2 &
                                    L2 = K2.ⓛW & I = BPair Abbr (ⓝW.V).
 /2 width=3 by lsubc_inv_bind1_aux/ qed-.
@@ -79,7 +79,7 @@ lemma lsubc_inv_atom2: ∀RP,G,L1. G ⊢ L1 ⫃[RP] ⋆ → L1 = ⋆.
 
 fact lsubc_inv_bind2_aux: ∀RP,G,L1,L2. G ⊢ L1 ⫃[RP] L2 → ∀I,K2. L2 = K2.ⓘ[I] →
                           (∃∃K1. G ⊢ K1 ⫃[RP] K2 & L1 = K1. ⓘ[I]) ∨
-                          ∃∃K1,V,W,A. ❪G,K1,V❫ ϵ ⟦A⟧[RP] & ❪G,K1,W❫ ϵ ⟦A⟧[RP] & ❪G,K2❫ ⊢ W ⁝ A &
+                          ∃∃K1,V,W,A. ❨G,K1,V❩ ϵ ⟦A⟧[RP] & ❨G,K1,W❩ ϵ ⟦A⟧[RP] & ❨G,K2❩ ⊢ W ⁝ A &
                                       G ⊢ K1 ⫃[RP] K2 &
                                       L1 = K1.ⓓⓝW.V & I = BPair Abst W.
 #RP #G #L1 #L2 * -L1 -L2
@@ -93,7 +93,7 @@ qed-.
 (* Basic_1: was just: csubc_gen_head_l *)
 lemma lsubc_inv_bind2: ∀RP,I,G,L1,K2. G ⊢ L1 ⫃[RP] K2.ⓘ[I] →
                        (∃∃K1. G ⊢ K1 ⫃[RP] K2 & L1 = K1.ⓘ[I]) ∨
-                       ∃∃K1,V,W,A. ❪G,K1,V❫ ϵ ⟦A⟧[RP] & ❪G,K1,W❫ ϵ ⟦A⟧[RP] & ❪G,K2❫ ⊢ W ⁝ A &
+                       ∃∃K1,V,W,A. ❨G,K1,V❩ ϵ ⟦A⟧[RP] & ❨G,K1,W❩ ϵ ⟦A⟧[RP] & ❨G,K2❩ ⊢ W ⁝ A &
                                    G ⊢ K1 ⫃[RP] K2 &
                                    L1 = K1.ⓓⓝW.V & I = BPair Abst W.
 /2 width=3 by lsubc_inv_bind2_aux/ qed-.