--- a/doc-src/TutorialI/Misc/document/arith3.tex Tue Aug 29 00:57:24 2000 +0200
+++ b/doc-src/TutorialI/Misc/document/arith3.tex Tue Aug 29 11:52:16 2000 +0200
@@ -1,6 +1,7 @@
-\begin{isabelle}%
+%
+\begin{isabellebody}%
\isacommand{lemma}\ {\isachardoublequote}n{\isacharasterisk}n\ {\isacharequal}\ n\ {\isasymLongrightarrow}\ n{\isacharequal}\isadigit{0}\ {\isasymor}\ n{\isacharequal}\isadigit{1}{\isachardoublequote}\isanewline
-\end{isabelle}%
+\end{isabellebody}%
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