diff -r 7e51c9f3d5a0 -r a5f86aed785b doc-src/TutorialI/Misc/document/let_rewr.tex
--- a/doc-src/TutorialI/Misc/document/let_rewr.tex	Tue Aug 29 15:13:10 2000 +0200
+++ b/doc-src/TutorialI/Misc/document/let_rewr.tex	Tue Aug 29 15:43:29 2000 +0200
@@ -1,11 +1,12 @@
-\begin{isabelle}%
+%
+\begin{isabellebody}%
 \isacommand{lemma}\ {\isachardoublequote}{\isacharparenleft}let\ xs\ {\isacharequal}\ {\isacharbrackleft}{\isacharbrackright}\ in\ xs{\isacharat}ys{\isacharat}xs{\isacharparenright}\ {\isacharequal}\ ys{\isachardoublequote}\isanewline
 \isacommand{by}{\isacharparenleft}simp\ add{\isacharcolon}\ Let{\isacharunderscore}def{\isacharparenright}%
 \begin{isamarkuptext}%
 If, in a particular context, there is no danger of a combinatorial explosion
 of nested \isa{let}s one could even add \isa{Let_def} permanently:%
 \end{isamarkuptext}%
-\isacommand{lemmas}\ {\isacharbrackleft}simp{\isacharbrackright}\ {\isacharequal}\ Let{\isacharunderscore}def\end{isabelle}%
+\isacommand{lemmas}\ {\isacharbrackleft}simp{\isacharbrackright}\ {\isacharequal}\ Let{\isacharunderscore}def\end{isabellebody}%
 %%% Local Variables:
 %%% mode: latex
 %%% TeX-master: "root"