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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_simple_teqo.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_simple_teqo.ma
index 23c4100ba..9fa132f25 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_simple_teqo.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx_simple_teqo.ma
@@ -25,9 +25,9 @@ include "basic_2/rt_computation/csx_csx.ma".
 (* Basic_1: was just: sn3_appl_appl *)
 (* Basic_2A1: was: csx_appl_simple_tsts *)
 lemma csx_appl_simple_teqo (G) (L):
-      ∀V. ❪G,L❫ ⊢ ⬈*𝐒 V → ∀T1. ❪G,L❫ ⊢ ⬈*𝐒 T1 →
-      (∀T2. ❪G,L❫ ⊢ T1 ⬈* T2 → (T1 ~ T2 → ⊥) → ❪G,L❫ ⊢ ⬈*𝐒 ⓐV.T2) →
-      𝐒❪T1❫ → ❪G,L❫ ⊢ ⬈*𝐒 ⓐV.T1.
+      ∀V. ❨G,L❩ ⊢ ⬈*𝐒 V → ∀T1. ❨G,L❩ ⊢ ⬈*𝐒 T1 →
+      (∀T2. ❨G,L❩ ⊢ T1 ⬈* T2 → (T1 ~ T2 → ⊥) → ❨G,L❩ ⊢ ⬈*𝐒 ⓐV.T2) →
+      𝐒❨T1❩ → ❨G,L❩ ⊢ ⬈*𝐒 ⓐV.T1.
 #G #L #V #H @(csx_ind … H) -V
 #V #_ #IHV #T1 #H @(csx_ind … H) -T1
 #T1 #H1T1 #IHT1 #H2T1 #H3T1