--- a/doc-src/TutorialI/Misc/document/natsum.tex Tue Aug 29 15:13:10 2000 +0200
+++ b/doc-src/TutorialI/Misc/document/natsum.tex Tue Aug 29 15:43:29 2000 +0200
@@ -1,4 +1,5 @@
-\begin{isabelle}%
+%
+\begin{isabellebody}%
%
\begin{isamarkuptext}%
\noindent
@@ -22,7 +23,7 @@
\isacommand{lemma}\ {\isachardoublequote}sum\ n\ {\isacharplus}\ sum\ n\ {\isacharequal}\ n{\isacharasterisk}{\isacharparenleft}Suc\ n{\isacharparenright}{\isachardoublequote}\isanewline
\isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ n{\isacharparenright}\isanewline
\isacommand{by}{\isacharparenleft}auto{\isacharparenright}\isanewline
-\end{isabelle}%
+\end{isabellebody}%
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