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src/HOL/Hyperreal/HyperDef.thy
changeset 14361 ad2f5da643b4
parent 14348 744c868ee0b7
child 14365 3d4df8c166ae 
--- a/src/HOL/Hyperreal/HyperDef.thy	Sun Jan 25 00:42:22 2004 +0100
+++ b/src/HOL/Hyperreal/HyperDef.thy	Mon Jan 26 10:34:02 2004 +0100
@@ -11,7 +11,7 @@
 
 constdefs
 
-  FreeUltrafilterNat   :: "nat set set"    ("\\<U>")
+  FreeUltrafilterNat   :: "nat set set"    ("\<U>")
     "FreeUltrafilterNat == (SOME U. U \<in> FreeUltrafilter (UNIV:: nat set))"
 
   hyprel :: "((nat=>real)*(nat=>real)) set"
isabelle