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diff --git a/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_lsuba.ma b/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_lsuba.ma
index 9fae68633..5d64516a5 100644
--- a/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_lsuba.ma
+++ b/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_lsuba.ma
@@ -18,7 +18,7 @@ include "basic_2/static/lsuba_aaa.ma".
 
 (* Main properties **********************************************************)
 
-theorem lsuba_trans: ∀L1,L. L1 ÷⊑ L → ∀L2. L ÷⊑ L2 → L1 ÷⊑ L2.
+theorem lsuba_trans: ∀L1,L. L1 ⁝⊑ L → ∀L2. L ⁝⊑ L2 → L1 ⁝⊑ L2.
 #L1 #L #H elim H -L1 -L
 [ #X #H >(lsuba_inv_atom1 … H) -H //
 | #I #L1 #L #V #HL1 #IHL1 #X #H