diff -r 91d67d2f121c -r cb6e0064c88c doc-src/TutorialI/CTL/CTL.thy
--- a/doc-src/TutorialI/CTL/CTL.thy	Thu Jan 19 21:22:29 2006 +0100
+++ b/doc-src/TutorialI/CTL/CTL.thy	Thu Jan 19 21:22:30 2006 +0100
@@ -10,7 +10,7 @@
 @{text formula} by a new constructor
 *};
 (*<*)
-datatype formula = Atom atom
+datatype formula = Atom "atom"
                   | Neg formula
                   | And formula formula
                   | AX formula