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diff --git a/matita/matita/contribs/lambdadelta/static_2/s_computation/fqus_drops.ma b/matita/matita/contribs/lambdadelta/static_2/s_computation/fqus_drops.ma
index 21bd6a775..bae2cb322 100644
--- a/matita/matita/contribs/lambdadelta/static_2/s_computation/fqus_drops.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/s_computation/fqus_drops.ma
@@ -20,7 +20,7 @@ include "static_2/s_computation/fqus_fqup.ma".
 (* Properties with generic slicing for local environments *******************)
 
 lemma fqus_drops: ∀b,G,L,K,T,U,i. ⇩[i] L ≘ K → ⇧[i] T ≘ U →
-                  ❪G,L,U❫ ⬂*[b] ❪G,K,T❫.
+                  ❨G,L,U❩ ⬂*[b] ❨G,K,T❩.
 #b #G #L #K #T #U * /3 width=3 by fqup_drops_succ, fqup_fqus/
 #HLK #HTU <(lifts_fwd_isid … HTU) -U // <(drops_fwd_isid … HLK) -K //
 qed.