diff -r 2c208c98f541 -r 1b2d4f995b13 doc-src/TutorialI/Misc/document/fakenat.tex
--- a/doc-src/TutorialI/Misc/document/fakenat.tex	Mon Aug 21 19:03:58 2000 +0200
+++ b/doc-src/TutorialI/Misc/document/fakenat.tex	Mon Aug 21 19:17:07 2000 +0200
@@ -5,7 +5,7 @@
 The type \isaindexbold{nat}\index{*0|bold}\index{*Suc|bold} of natural
 numbers is predefined and behaves like%
 \end{isamarkuptext}%
-\isacommand{datatype}\ nat\ =\ 0\ |\ Suc\ nat\end{isabelle}%
+\isacommand{datatype}\ nat\ {\isacharequal}\ \isadigit{0}\ {\isacharbar}\ Suc\ nat\end{isabelle}%
 %%% Local Variables:
 %%% mode: latex
 %%% TeX-master: "root"