1.1 --- a/src/HOL/Hyperreal/HyperDef.thy	Sun Jan 25 00:42:22 2004 +0100
     1.2 +++ b/src/HOL/Hyperreal/HyperDef.thy	Mon Jan 26 10:34:02 2004 +0100
     1.3 @@ -11,7 +11,7 @@
     1.4  
     1.5  constdefs
     1.6  
     1.7 -  FreeUltrafilterNat   :: "nat set set"    ("\\<U>")
     1.8 +  FreeUltrafilterNat   :: "nat set set"    ("\<U>")
     1.9      "FreeUltrafilterNat == (SOME U. U \<in> FreeUltrafilter (UNIV:: nat set))"
    1.10  
    1.11    hyprel :: "((nat=>real)*(nat=>real)) set"