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diff --git a/matita/matita/contribs/lambdadelta/ground/notation/functions/infinity_0.ma b/matita/matita/contribs/lambdadelta/ground/notation/functions/infinity_0.ma
index f5c849158..4415410b1 100644
--- a/matita/matita/contribs/lambdadelta/ground/notation/functions/infinity_0.ma
+++ b/matita/matita/contribs/lambdadelta/ground/notation/functions/infinity_0.ma
@@ -12,9 +12,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
-(* GENERAL NOTATION USED BY THE FORMAL SYSTEM λδ ****************************)
+(* GROUND NOTATION **********************************************************)
 
 notation "∞"
-   non associative with precedence 55
-   for @{ 'Infinity }.
-
+  non associative with precedence 70
+  for @{ 'Infinity }.