diff -r 5fefe658a6f8 -r 5f42dd5e6570 doc-src/TutorialI/Misc/document/natsum.tex
--- a/doc-src/TutorialI/Misc/document/natsum.tex	Mon Aug 29 10:28:17 2005 +0200
+++ b/doc-src/TutorialI/Misc/document/natsum.tex	Mon Aug 29 11:44:23 2005 +0200
@@ -1,13 +1,13 @@
 %
 \begin{isabellebody}%
 \def\isabellecontext{natsum}%
+\isamarkupfalse%
 %
 \isadelimtheory
 %
 \endisadelimtheory
 %
 \isatagtheory
-\isamarkupfalse%
 %
 \endisatagtheory
 {\isafoldtheory}%
@@ -118,7 +118,6 @@
 \endisadelimproof
 %
 \isatagproof
-\isamarkupfalse%
 %
 \endisatagproof
 {\isafoldproof}%
@@ -141,7 +140,6 @@
 \endisadelimproof
 %
 \isatagproof
-\isamarkupfalse%
 %
 \endisatagproof
 {\isafoldproof}%
@@ -169,8 +167,7 @@
 %
 \isatagproof
 \isacommand{apply}\isamarkupfalse%
-{\isacharparenleft}arith{\isacharparenright}\isamarkupfalse%
-%
+{\isacharparenleft}arith{\isacharparenright}%
 \endisatagproof
 {\isafoldproof}%
 %
@@ -190,7 +187,6 @@
 \endisadelimproof
 %
 \isatagproof
-\isamarkupfalse%
 %
 \endisatagproof
 {\isafoldproof}%
@@ -224,7 +220,6 @@
 \endisadelimtheory
 %
 \isatagtheory
-\isamarkupfalse%
 %
 \endisatagtheory
 {\isafoldtheory}%