diff -r 3b7b72db57f1 -r 7e51c9f3d5a0 doc-src/TutorialI/Misc/document/Tree.tex
--- a/doc-src/TutorialI/Misc/document/Tree.tex	Tue Aug 29 12:28:48 2000 +0200
+++ b/doc-src/TutorialI/Misc/document/Tree.tex	Tue Aug 29 15:13:10 2000 +0200
@@ -1,5 +1,4 @@
-%
-\begin{isabellebody}%
+\begin{isabelle}%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -17,7 +16,7 @@
 Define a function \isa{flatten} that flattens a tree into a list
 by traversing it in infix order. Prove%
 \end{isamarkuptext}%
-\isacommand{lemma}\ {\isachardoublequote}flatten{\isacharparenleft}mirror\ t{\isacharparenright}\ {\isacharequal}\ rev{\isacharparenleft}flatten\ t{\isacharparenright}{\isachardoublequote}\end{isabellebody}%
+\isacommand{lemma}\ {\isachardoublequote}flatten{\isacharparenleft}mirror\ t{\isacharparenright}\ {\isacharequal}\ rev{\isacharparenleft}flatten\ t{\isacharparenright}{\isachardoublequote}\end{isabelle}%
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