diff -r 11aa41ed306d -r 1eced27ee0e1 doc-src/TutorialI/Misc/document/Itrev.tex
--- a/doc-src/TutorialI/Misc/document/Itrev.tex	Sun Aug 28 19:42:10 2005 +0200
+++ b/doc-src/TutorialI/Misc/document/Itrev.tex	Sun Aug 28 19:42:19 2005 +0200
@@ -7,6 +7,7 @@
 \endisadelimtheory
 %
 \isatagtheory
+\isamarkupfalse%
 %
 \endisatagtheory
 {\isafoldtheory}%
@@ -14,7 +15,6 @@
 \isadelimtheory
 %
 \endisadelimtheory
-\isamarkuptrue%
 %
 \isamarkupsection{Induction Heuristics%
 }
@@ -58,13 +58,13 @@
 \isa{rev} reqires an extra argument where the result is accumulated
 gradually, using only~\isa{{\isacharhash}}:%
 \end{isamarkuptext}%
-\isamarkupfalse%
-\isacommand{consts}\ itrev\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list{\isachardoublequote}\isanewline
-\isamarkupfalse%
-\isacommand{primrec}\isanewline
-{\isachardoublequote}itrev\ {\isacharbrackleft}{\isacharbrackright}\ \ \ \ \ ys\ {\isacharequal}\ ys{\isachardoublequote}\isanewline
-{\isachardoublequote}itrev\ {\isacharparenleft}x{\isacharhash}xs{\isacharparenright}\ ys\ {\isacharequal}\ itrev\ xs\ {\isacharparenleft}x{\isacharhash}ys{\isacharparenright}{\isachardoublequote}\isamarkuptrue%
-%
+\isamarkuptrue%
+\isacommand{consts}\isamarkupfalse%
+\ itrev\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequoteopen}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list{\isachardoublequoteclose}\isanewline
+\isacommand{primrec}\isamarkupfalse%
+\isanewline
+{\isachardoublequoteopen}itrev\ {\isacharbrackleft}{\isacharbrackright}\ \ \ \ \ ys\ {\isacharequal}\ ys{\isachardoublequoteclose}\isanewline
+{\isachardoublequoteopen}itrev\ {\isacharparenleft}x{\isacharhash}xs{\isacharparenright}\ ys\ {\isacharequal}\ itrev\ xs\ {\isacharparenleft}x{\isacharhash}ys{\isacharparenright}{\isachardoublequoteclose}%
 \begin{isamarkuptext}%
 \noindent
 The behaviour of \cdx{itrev} is simple: it reverses
@@ -76,22 +76,22 @@
 Naturally, we would like to show that \isa{Itrev{\isachardot}itrev} does indeed reverse
 its first argument provided the second one is empty:%
 \end{isamarkuptext}%
-\isamarkupfalse%
-\isacommand{lemma}\ {\isachardoublequote}itrev\ xs\ {\isacharbrackleft}{\isacharbrackright}\ {\isacharequal}\ rev\ xs{\isachardoublequote}%
+\isamarkuptrue%
+\isacommand{lemma}\isamarkupfalse%
+\ {\isachardoublequoteopen}itrev\ xs\ {\isacharbrackleft}{\isacharbrackright}\ {\isacharequal}\ rev\ xs{\isachardoublequoteclose}%
 \isadelimproof
 %
 \endisadelimproof
 %
 \isatagproof
-\isamarkuptrue%
 %
 \begin{isamarkuptxt}%
 \noindent
 There is no choice as to the induction variable, and we immediately simplify:%
 \end{isamarkuptxt}%
-\isamarkupfalse%
-\isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharcomma}\ simp{\isacharunderscore}all{\isacharparenright}\isamarkuptrue%
-%
+\isamarkuptrue%
+\isacommand{apply}\isamarkupfalse%
+{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharcomma}\ simp{\isacharunderscore}all{\isacharparenright}%
 \begin{isamarkuptxt}%
 \noindent
 Unfortunately, this attempt does not prove
@@ -110,6 +110,8 @@
 Of course one cannot do this na\"{\i}vely: \isa{Itrev{\isachardot}itrev\ xs\ ys\ {\isacharequal}\ rev\ xs} is
 just not true.  The correct generalization is%
 \end{isamarkuptxt}%
+\isamarkuptrue%
+\isamarkupfalse%
 %
 \endisatagproof
 {\isafoldproof}%
@@ -117,14 +119,14 @@
 \isadelimproof
 %
 \endisadelimproof
-\isamarkupfalse%
-\isacommand{lemma}\ {\isachardoublequote}itrev\ xs\ ys\ {\isacharequal}\ rev\ xs\ {\isacharat}\ ys{\isachardoublequote}%
+\isacommand{lemma}\isamarkupfalse%
+\ {\isachardoublequoteopen}itrev\ xs\ ys\ {\isacharequal}\ rev\ xs\ {\isacharat}\ ys{\isachardoublequoteclose}%
 \isadelimproof
 %
 \endisadelimproof
 %
 \isatagproof
-\isamarkuptrue%
+\isamarkupfalse%
 %
 \begin{isamarkuptxt}%
 \noindent
@@ -148,6 +150,8 @@
 \isa{a\ {\isacharhash}\ ys} instead of \isa{ys}. Hence we prove the theorem
 for all \isa{ys} instead of a fixed one:%
 \end{isamarkuptxt}%
+\isamarkuptrue%
+\isamarkupfalse%
 %
 \endisatagproof
 {\isafoldproof}%
@@ -155,13 +159,14 @@
 \isadelimproof
 %
 \endisadelimproof
-\isamarkupfalse%
-\isacommand{lemma}\ {\isachardoublequote}{\isasymforall}ys{\isachardot}\ itrev\ xs\ ys\ {\isacharequal}\ rev\ xs\ {\isacharat}\ ys{\isachardoublequote}%
+\isacommand{lemma}\isamarkupfalse%
+\ {\isachardoublequoteopen}{\isasymforall}ys{\isachardot}\ itrev\ xs\ ys\ {\isacharequal}\ rev\ xs\ {\isacharat}\ ys{\isachardoublequoteclose}%
 \isadelimproof
 %
 \endisadelimproof
 %
 \isatagproof
+\isamarkupfalse%
 %
 \endisatagproof
 {\isafoldproof}%
@@ -169,7 +174,6 @@
 \isadelimproof
 %
 \endisadelimproof
-\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -205,12 +209,14 @@
 to learn about some advanced techniques for inductive proofs.%
 \index{induction heuristics|)}%
 \end{isamarkuptext}%
+\isamarkuptrue%
 %
 \isadelimtheory
 %
 \endisadelimtheory
 %
 \isatagtheory
+\isamarkupfalse%
 %
 \endisatagtheory
 {\isafoldtheory}%