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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_lpx.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_lpx.ma
index 845fc6d27..54202be4a 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_lpx.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_lpx.ma
@@ -21,25 +21,25 @@ include "basic_2/rt_transition/lpx.ma".
 (* Properties with syntactic equivalence for referred local environments ****)
 
 lemma req_rpx (G) (T):
-      ∀L1,L2. L1 ≡[T] L2 → ❪G,L1❫ ⊢ ⬈[T] L2.
+      ∀L1,L2. L1 ≡[T] L2 → ❨G,L1❩ ⊢ ⬈[T] L2.
 /2 width=1 by req_fwd_rex/ qed.
 
 (* Properties with extended rt-transition for full local envs ***************)
 
 lemma lpx_rpx (G) (T):
-      ∀L1,L2. ❪G,L1❫ ⊢ ⬈ L2 → ❪G,L1❫ ⊢ ⬈[T] L2.
+      ∀L1,L2. ❨G,L1❩ ⊢ ⬈ L2 → ❨G,L1❩ ⊢ ⬈[T] L2.
 /2 width=1 by rex_lex/ qed.
 
 (* Inversion lemmas with extended rt-transition for full local envs *********)
 
 lemma rpx_inv_req_lpx (G) (T):
-      ∀L1,L2. ❪G,L1❫ ⊢ ⬈[T] L2 →
-      ∃∃L. L1 ≡[T] L & ❪G,L❫ ⊢ ⬈ L2.
+      ∀L1,L2. ❨G,L1❩ ⊢ ⬈[T] L2 →
+      ∃∃L. L1 ≡[T] L & ❨G,L❩ ⊢ ⬈ L2.
 /4 width=13 by cpx_reqg_conf, rex_inv_req_lex, rex_conf1_next/ qed-.
 
 (* Forward lemmas with extended rt-transition for full local envs ***********)
 
 lemma rpx_fwd_lpx_req (G) (T):
-      ∀L1,L2. ❪G,L1❫ ⊢ ⬈[T] L2 →
-      ∃∃L. ❪G,L1❫ ⊢ ⬈ L & L ≡[T] L2.
+      ∀L1,L2. ❨G,L1❩ ⊢ ⬈[T] L2 →
+      ∃∃L. ❨G,L1❩ ⊢ ⬈ L & L ≡[T] L2.
 /3 width=3 by rpx_fsge_comp, rex_fwd_lex_req/ qed-.