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diff --git a/matita/matita/contribs/lambdadelta/static_2/notation/relations/supterm_7.ma b/matita/matita/contribs/lambdadelta/static_2/notation/relations/supterm_7.ma
index 2e12296b4..011caa06b 100644
--- a/matita/matita/contribs/lambdadelta/static_2/notation/relations/supterm_7.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/notation/relations/supterm_7.ma
@@ -14,6 +14,6 @@
 
 (* NOTATION FOR THE FORMAL SYSTEM λδ ****************************************)
 
-notation "hvbox( ⦃ term 46 G1, break term 46 L1, break term 46 T1 ⦄ ⊐ [ break term 46 b ] ⦃ break term 46 G2, break term 46 L2, break term 46 T2 ⦄ )"
+notation "hvbox( ⦃ term 46 G1, break term 46 L1, break term 46 T1 ⦄ ⬂ [ break term 46 b ] ⦃ break term 46 G2, break term 46 L2, break term 46 T2 ⦄ )"
    non associative with precedence 45
    for @{ 'SupTerm $b $G1 $L1 $T1 $G2 $L2 $T2 }.