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src/FOL/ex/Prolog.thy
changeset 69587 53982d5ec0bb
parent 62020 5d208fd2507d
child 69590 e65314985426 
--- a/src/FOL/ex/Prolog.thy	Thu Jan 03 21:06:39 2019 +0100
+++ b/src/FOL/ex/Prolog.thy	Thu Jan 03 21:15:52 2019 +0100
@@ -14,7 +14,7 @@
 
 axiomatization
   Nil     :: "'a list" and
-  Cons    :: "['a, 'a list]=> 'a list"    (infixr ":" 60) and
+  Cons    :: "['a, 'a list]=> 'a list"    (infixr \<open>:\<close> 60) and
   app     :: "['a list, 'a list, 'a list] => o" and
   rev     :: "['a list, 'a list] => o"
 where
isabelle