diff -r 3b7b72db57f1 -r 7e51c9f3d5a0 doc-src/TutorialI/Misc/document/Tree2.tex
--- a/doc-src/TutorialI/Misc/document/Tree2.tex	Tue Aug 29 12:28:48 2000 +0200
+++ b/doc-src/TutorialI/Misc/document/Tree2.tex	Tue Aug 29 15:13:10 2000 +0200
@@ -1,5 +1,4 @@
-%
-\begin{isabellebody}%
+\begin{isabelle}%
 %
 \begin{isamarkuptext}%
 \noindent In Exercise~\ref{ex:Tree} we defined a function
@@ -12,7 +11,7 @@
 \begin{isamarkuptext}%
 \noindent Define \isa{flatten2} and prove%
 \end{isamarkuptext}%
-\isacommand{lemma}\ {\isachardoublequote}flatten\isadigit{2}\ t\ {\isacharbrackleft}{\isacharbrackright}\ {\isacharequal}\ flatten\ t{\isachardoublequote}\end{isabellebody}%
+\isacommand{lemma}\ {\isachardoublequote}flatten\isadigit{2}\ t\ {\isacharbrackleft}{\isacharbrackright}\ {\isacharequal}\ flatten\ t{\isachardoublequote}\end{isabelle}%
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