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diff --git a/matita/matita/contribs/lambdadelta/static_2/s_transition/fqu_teqg.ma b/matita/matita/contribs/lambdadelta/static_2/s_transition/fqu_teqg.ma
index 366fad94a..07b529abe 100644
--- a/matita/matita/contribs/lambdadelta/static_2/s_transition/fqu_teqg.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/s_transition/fqu_teqg.ma
@@ -20,7 +20,7 @@ include "static_2/s_transition/fqu_length.ma".
 (* Inversion lemmas with context-free generic equivalence for terms *********)
 
 fact fqu_inv_teqg_aux (S) (b):
-     ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂[b] ❪G2,L2,T2❫ →
+     ∀G1,G2,L1,L2,T1,T2. ❨G1,L1,T1❩ ⬂[b] ❨G2,L2,T2❩ →
      G1 = G2 → |L1| = |L2| → T1 ≛[S] T2 → ⊥.
 #S #b #G1 #G2 #L1 #L2 #T1 #T2 * -G1 -G2 -L1 -L2 -T1 -T2
 [1: #I #G #L #V #_ #H elim (nsucc_inv_refl … H)
@@ -31,7 +31,7 @@ qed-.
 
 (* Basic_2A1: uses: fqu_inv_eq *)
 lemma fqu_inv_teqg (S) (b):
-      ∀G,L1,L2,T1,T2. ❪G,L1,T1❫ ⬂[b] ❪G,L2,T2❫ →
+      ∀G,L1,L2,T1,T2. ❨G,L1,T1❩ ⬂[b] ❨G,L2,T2❩ →
       |L1| = |L2| → T1 ≛[S] T2 → ⊥.
 #S #b #G #L1 #L2 #T1 #T2 #H
 @(fqu_inv_teqg_aux … H) // (**) (* full auto fails *)