# HG changeset patch
# User wenzelm
# Date 1124441405 -7200
# Node ID e6a82d1a1829370308a313e8ed804645899913e2
# Parent  19ea4a0f4ec91eb4065a36863e4d0f98363b25ef
updated;

diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/IsarOverview/Isar/document/Induction.tex
--- a/doc-src/IsarOverview/Isar/document/Induction.tex	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/IsarOverview/Isar/document/Induction.tex	Fri Aug 19 10:50:05 2005 +0200
@@ -1,7 +1,20 @@
 %
 \begin{isabellebody}%
 \def\isabellecontext{Induction}%
-\isamarkupfalse%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+%
+\isatagtheory
+%
+\endisatagtheory
+{\isafoldtheory}%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+\isamarkuptrue%
 %
 \isamarkupsection{Case distinction and induction \label{sec:Induct}%
 }
@@ -23,8 +36,14 @@
 We have already met the \isa{cases} method for performing
 binary case splits. Here is another example:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isasymnot}\ A\ {\isasymor}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ cases\isanewline
 \ \ \isamarkupfalse%
@@ -38,7 +57,14 @@
 \isacommand{thus}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent The two cases must come in this order because \isa{cases} merely abbreviates \isa{{\isacharparenleft}rule\ case{\isacharunderscore}split{\isacharunderscore}thm{\isacharparenright}} where
@@ -52,8 +78,14 @@
 However, if \isa{A} is large, we do not want to repeat it. This can
 be avoided by the following idiom%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isasymnot}\ A\ {\isasymor}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}cases\ {\isachardoublequote}A{\isachardoublequote}{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -67,7 +99,14 @@
 \isacommand{thus}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent which is like the previous proof but instantiates
@@ -80,9 +119,14 @@
 where \isa{tl} is the tail of a list, and \isa{length} returns a
 natural number (remember: $0-1=0$):%
 \end{isamarkuptext}%
-\isamarkuptrue%
 \isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}length{\isacharparenleft}tl\ xs{\isacharparenright}\ {\isacharequal}\ length\ xs\ {\isacharminus}\ {\isadigit{1}}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}cases\ xs{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -96,7 +140,14 @@
 \isacommand{thus}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{by}\ simp\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Here `\isakeyword{case}~\isa{Nil}' abbreviates
@@ -126,10 +177,23 @@
 \begin{isamarkuptext}%
 We start with an inductive proof where both cases are proved automatically:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isadigit{2}}\ {\isacharasterisk}\ {\isacharparenleft}{\isasymSum}i{\isacharcolon}{\isacharcolon}nat{\isasymle}n{\isachardot}\ i{\isacharparenright}\ {\isacharequal}\ n{\isacharasterisk}{\isacharparenleft}n{\isacharplus}{\isadigit{1}}{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
-\isacommand{by}\ {\isacharparenleft}induct\ n{\isacharcomma}\ simp{\isacharunderscore}all{\isacharparenright}\isamarkupfalse%
+\isacommand{by}\ {\isacharparenleft}induct\ n{\isacharcomma}\ simp{\isacharunderscore}all{\isacharparenright}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent The constraint \isa{{\isacharcolon}{\isacharcolon}nat} is needed because all of
@@ -139,8 +203,14 @@
 proof, we can use pattern matching to avoid having to repeat the goal
 statement:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isadigit{2}}\ {\isacharasterisk}\ {\isacharparenleft}{\isasymSum}i{\isacharcolon}{\isacharcolon}nat{\isasymle}n{\isachardot}\ i{\isacharparenright}\ {\isacharequal}\ n{\isacharasterisk}{\isacharparenleft}n{\isacharplus}{\isadigit{1}}{\isacharparenright}{\isachardoublequote}\ {\isacharparenleft}\isakeyword{is}\ {\isachardoublequote}{\isacharquery}P\ n{\isachardoublequote}{\isacharparenright}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}induct\ n{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -155,15 +225,28 @@
 \isacommand{thus}\ {\isachardoublequote}{\isacharquery}P{\isacharparenleft}Suc\ n{\isacharparenright}{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{by}\ simp\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent We could refine this further to show more of the equational
 proof. Instead we explore the same avenue as for case distinctions:
 introducing context via the \isakeyword{case} command:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isadigit{2}}\ {\isacharasterisk}\ {\isacharparenleft}{\isasymSum}i{\isacharcolon}{\isacharcolon}nat\ {\isasymle}\ n{\isachardot}\ i{\isacharparenright}\ {\isacharequal}\ n{\isacharasterisk}{\isacharparenleft}n{\isacharplus}{\isadigit{1}}{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}induct\ n{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -177,7 +260,14 @@
 \isacommand{thus}\ {\isacharquery}case\ \isamarkupfalse%
 \isacommand{by}\ simp\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent The implicitly defined \isa{{\isacharquery}case} refers to the
@@ -189,8 +279,14 @@
 (in contrast to the previous proof). The solution is the one outlined for
 \isa{Cons} above: replace \isa{Suc} by \isa{{\isacharparenleft}Suc\ i{\isacharparenright}}:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{fixes}\ n{\isacharcolon}{\isacharcolon}nat\ \isakeyword{shows}\ {\isachardoublequote}n\ {\isacharless}\ n{\isacharasterisk}n\ {\isacharplus}\ {\isadigit{1}}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}induct\ n{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -204,7 +300,14 @@
 \isacommand{thus}\ {\isachardoublequote}Suc\ i\ {\isacharless}\ Suc\ i\ {\isacharasterisk}\ Suc\ i\ {\isacharplus}\ {\isadigit{1}}{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{by}\ simp\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Of course we could again have written
@@ -232,9 +335,15 @@
 As an example we will now prove complete induction via
 structural induction.%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ A{\isacharcolon}\ {\isachardoublequote}{\isacharparenleft}{\isasymAnd}n{\isachardot}\ {\isacharparenleft}{\isasymAnd}m{\isachardot}\ m\ {\isacharless}\ n\ {\isasymLongrightarrow}\ P\ m{\isacharparenright}\ {\isasymLongrightarrow}\ P\ n{\isacharparenright}{\isachardoublequote}\isanewline
 \ \ \isakeyword{shows}\ {\isachardoublequote}P{\isacharparenleft}n{\isacharcolon}{\isacharcolon}nat{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}rule\ A{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -285,7 +394,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Given the explanations above and the comments in the
@@ -315,13 +431,13 @@
 for details. As an example we define our own version of the reflexive
 transitive closure of a relation --- HOL provides a predefined one as well.%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{consts}\ rtc\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharparenleft}{\isacharprime}a\ {\isasymtimes}\ {\isacharprime}a{\isacharparenright}set\ {\isasymRightarrow}\ {\isacharparenleft}{\isacharprime}a\ {\isasymtimes}\ {\isacharprime}a{\isacharparenright}set{\isachardoublequote}\ \ \ {\isacharparenleft}{\isachardoublequote}{\isacharunderscore}{\isacharasterisk}{\isachardoublequote}\ {\isacharbrackleft}{\isadigit{1}}{\isadigit{0}}{\isadigit{0}}{\isadigit{0}}{\isacharbrackright}\ {\isadigit{9}}{\isadigit{9}}{\isadigit{9}}{\isacharparenright}\isanewline
 \isamarkupfalse%
 \isacommand{inductive}\ {\isachardoublequote}r{\isacharasterisk}{\isachardoublequote}\isanewline
 \isakeyword{intros}\isanewline
 refl{\isacharcolon}\ \ {\isachardoublequote}{\isacharparenleft}x{\isacharcomma}x{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\isanewline
-step{\isacharcolon}\ \ {\isachardoublequote}{\isasymlbrakk}\ {\isacharparenleft}x{\isacharcomma}y{\isacharparenright}\ {\isasymin}\ r{\isacharsemicolon}\ {\isacharparenleft}y{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}\ {\isasymrbrakk}\ {\isasymLongrightarrow}\ {\isacharparenleft}x{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\isamarkupfalse%
+step{\isacharcolon}\ \ {\isachardoublequote}{\isasymlbrakk}\ {\isacharparenleft}x{\isacharcomma}y{\isacharparenright}\ {\isasymin}\ r{\isacharsemicolon}\ {\isacharparenleft}y{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}\ {\isasymrbrakk}\ {\isasymLongrightarrow}\ {\isacharparenleft}x{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -329,8 +445,14 @@
 relations (with concrete syntax \isa{r{\isacharasterisk}} instead of \isa{rtc\ r}), then the defining clauses are given. We will now prove that
 \isa{r{\isacharasterisk}} is indeed transitive:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ A{\isacharcolon}\ {\isachardoublequote}{\isacharparenleft}x{\isacharcomma}y{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isacharparenleft}y{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}\ {\isasymLongrightarrow}\ {\isacharparenleft}x{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{using}\ A\isanewline
 \isamarkupfalse%
@@ -346,7 +468,14 @@
 \isacommand{thus}\ {\isacharquery}case\ \isamarkupfalse%
 \isacommand{by}{\isacharparenleft}blast\ intro{\isacharcolon}\ rtc{\isachardot}step{\isacharparenright}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Rule induction is triggered by a fact $(x_1,\dots,x_n)
@@ -357,9 +486,15 @@
 
 However, this proof is rather terse. Here is a more readable version:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ A{\isacharcolon}\ {\isachardoublequote}{\isacharparenleft}x{\isacharcomma}y{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\ \isakeyword{and}\ B{\isacharcolon}\ {\isachardoublequote}{\isacharparenleft}y{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\isanewline
 \ \ \isakeyword{shows}\ {\isachardoublequote}{\isacharparenleft}x{\isacharcomma}z{\isacharparenright}\ {\isasymin}\ r{\isacharasterisk}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
@@ -391,7 +526,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent We start the proof with \isakeyword{from}~\isa{A\ B}. Only \isa{A} is ``consumed'' by the induction step.
@@ -425,7 +567,7 @@
 
 The example is an unusual definition of rotation:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{consts}\ rot\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list{\isachardoublequote}\isanewline
 \isamarkupfalse%
 \isacommand{recdef}\ rot\ {\isachardoublequote}measure\ length{\isachardoublequote}\ \ %
@@ -434,7 +576,7 @@
 \isanewline
 {\isachardoublequote}rot\ {\isacharbrackleft}{\isacharbrackright}\ {\isacharequal}\ {\isacharbrackleft}{\isacharbrackright}{\isachardoublequote}\isanewline
 {\isachardoublequote}rot\ {\isacharbrackleft}x{\isacharbrackright}\ {\isacharequal}\ {\isacharbrackleft}x{\isacharbrackright}{\isachardoublequote}\isanewline
-{\isachardoublequote}rot\ {\isacharparenleft}x{\isacharhash}y{\isacharhash}zs{\isacharparenright}\ {\isacharequal}\ y\ {\isacharhash}\ rot{\isacharparenleft}x{\isacharhash}zs{\isacharparenright}{\isachardoublequote}\isamarkupfalse%
+{\isachardoublequote}rot\ {\isacharparenleft}x{\isacharhash}y{\isacharhash}zs{\isacharparenright}\ {\isacharequal}\ y\ {\isacharhash}\ rot{\isacharparenleft}x{\isacharhash}zs{\isacharparenright}{\isachardoublequote}\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent This yields, among other things, the induction rule
@@ -446,8 +588,14 @@
 only with datatypes and inductively defined sets, but not with recursive
 functions.%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}xs\ {\isasymnoteq}\ {\isacharbrackleft}{\isacharbrackright}\ {\isasymLongrightarrow}\ rot\ xs\ {\isacharequal}\ tl\ xs\ {\isacharat}\ {\isacharbrackleft}hd\ xs{\isacharbrackright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}induct\ xs\ rule{\isacharcolon}\ rot{\isachardot}induct{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -480,7 +628,14 @@
 \isacommand{show}\ {\isacharquery}case\ \isamarkupfalse%
 \isacommand{{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -496,11 +651,34 @@
 
 The proof is so simple that it can be condensed to%
 \end{isamarkuptext}%
-\isamarkuptrue%
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{by}\ {\isacharparenleft}induct\ xs\ rule{\isacharcolon}\ rot{\isachardot}induct{\isacharcomma}\ simp{\isacharunderscore}all{\isacharparenright}\isanewline
-\isamarkupfalse%
-\isamarkupfalse%
+%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isadelimtheory
+%
+\endisadelimtheory
+%
+\isatagtheory
+%
+\endisatagtheory
+{\isafoldtheory}%
+%
+\isadelimtheory
+%
+\endisadelimtheory
 \end{isabellebody}%
 %%% Local Variables:
 %%% mode: latex
diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/IsarOverview/Isar/document/Logic.tex
--- a/doc-src/IsarOverview/Isar/document/Logic.tex	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/IsarOverview/Isar/document/Logic.tex	Fri Aug 19 10:50:05 2005 +0200
@@ -1,7 +1,20 @@
 %
 \begin{isabellebody}%
 \def\isabellecontext{Logic}%
-\isamarkupfalse%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+%
+\isatagtheory
+%
+\endisatagtheory
+{\isafoldtheory}%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+\isamarkuptrue%
 %
 \isamarkupsection{Logic \label{sec:Logic}%
 }
@@ -19,8 +32,14 @@
 We start with a really trivial toy proof to introduce the basic
 features of structured proofs.%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymlongrightarrow}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharparenleft}rule\ impI{\isacharparenright}\isanewline
 \ \ \isamarkupfalse%
@@ -29,7 +48,14 @@
 \isacommand{show}\ {\isachardoublequote}A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{by}{\isacharparenleft}rule\ a{\isacharparenright}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -42,8 +68,14 @@
 based on the goal and a predefined list of rules.  \end{quote} Here
 \isa{impI} is applied automatically:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymlongrightarrow}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -52,7 +84,14 @@
 \isacommand{show}\ A\ \isamarkupfalse%
 \isacommand{by}{\isacharparenleft}rule\ a{\isacharparenright}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Single-identifier formulae such as \isa{A} need not
@@ -63,8 +102,14 @@
 to perform. Proof ``.'' does just that (and a bit more). Thus
 naming of assumptions is often superfluous:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymlongrightarrow}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -73,15 +118,28 @@
 \isacommand{show}\ {\isachardoublequote}A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 To hide proofs by assumption further, \isakeyword{by}\isa{{\isacharparenleft}method{\isacharparenright}}
 first applies \isa{method} and then tries to solve all remaining subgoals
 by assumption:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymlongrightarrow}\ A\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -90,7 +148,14 @@
 \isacommand{show}\ {\isachardoublequote}A\ {\isasymand}\ A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{by}{\isacharparenleft}rule\ conjI{\isacharparenright}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Rule \isa{conjI} is of course \isa{{\isasymlbrakk}{\isacharquery}P{\isacharsemicolon}\ {\isacharquery}Q{\isasymrbrakk}\ {\isasymLongrightarrow}\ {\isacharquery}P\ {\isasymand}\ {\isacharquery}Q}.
@@ -101,8 +166,14 @@
 can be abbreviated to ``..''  if \emph{name} refers to one of the
 predefined introduction rules (or elimination rules, see below):%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymlongrightarrow}\ A\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -111,7 +182,14 @@
 \isacommand{show}\ {\isachardoublequote}A\ {\isasymand}\ A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -133,8 +211,14 @@
 by hand, after its first (\emph{major}) premise has been eliminated via
 \isa{{\isacharbrackleft}OF\ AB{\isacharbrackright}}:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymand}\ B\ {\isasymlongrightarrow}\ B\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -154,7 +238,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Note that the term \isa{{\isacharquery}thesis} always stands for the
@@ -177,8 +268,14 @@
 whose first premise is solved by the \emph{fact}. Thus the proof above
 is equivalent to the following one:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymand}\ B\ {\isasymlongrightarrow}\ B\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -196,7 +293,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 Now we come to a second important principle:
@@ -207,8 +311,14 @@
 The previous proposition can be referred to via the fact \isa{this}.
 This greatly reduces the need for explicit naming of propositions:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymand}\ B\ {\isasymlongrightarrow}\ B\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -226,7 +336,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Because of the frequency of \isakeyword{from}~\isa{this}, Isar provides two abbreviations:
@@ -239,8 +356,14 @@
 
 Here is an alternative proof that operates purely by forward reasoning:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymand}\ B\ {\isasymlongrightarrow}\ B\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -258,7 +381,14 @@
 \isacommand{show}\ {\isachardoublequote}B\ {\isasymand}\ A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent It is worth examining this text in detail because it
@@ -306,8 +436,14 @@
 UNIX-pipe model appears to break down and we need to name the different
 facts to refer to them. But this can be avoided:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymand}\ B\ {\isasymlongrightarrow}\ B\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -327,7 +463,14 @@
 \isacommand{show}\ {\isachardoublequote}B\ {\isasymand}\ A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent You can combine any number of facts \isa{A{\isadigit{1}}} \dots\ \isa{An} into a sequence by separating their proofs with
@@ -343,8 +486,14 @@
 rules. We conclude our exposition of propositional logic with an extended
 example --- which rules are used implicitly where?%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isasymnot}\ {\isacharparenleft}A\ {\isasymand}\ B{\isacharparenright}\ {\isasymlongrightarrow}\ {\isasymnot}\ A\ {\isasymor}\ {\isasymnot}\ B{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -395,7 +544,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -422,8 +578,14 @@
 So far our examples have been a bit unnatural: normally we want to
 prove rules expressed with \isa{{\isasymLongrightarrow}}, not \isa{{\isasymlongrightarrow}}. Here is an example:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymand}\ B\ {\isasymLongrightarrow}\ B\ {\isasymand}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -437,7 +599,14 @@
 \isacommand{thus}\ {\isachardoublequote}A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent The \isakeyword{proof} always works on the conclusion,
@@ -464,9 +633,15 @@
 devices to avoid repeating (possibly large) formulae. A very general method
 is pattern matching:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}large{\isacharunderscore}A\ {\isasymand}\ large{\isacharunderscore}B\ {\isasymLongrightarrow}\ large{\isacharunderscore}B\ {\isasymand}\ large{\isacharunderscore}A{\isachardoublequote}\isanewline
 \ \ \ \ \ \ {\isacharparenleft}\isakeyword{is}\ {\isachardoublequote}{\isacharquery}AB\ {\isasymLongrightarrow}\ {\isacharquery}B\ {\isasymand}\ {\isacharquery}A{\isachardoublequote}{\isacharparenright}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -480,7 +655,14 @@
 \isacommand{thus}\ {\isachardoublequote}{\isacharquery}A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Any formula may be followed by
@@ -493,9 +675,15 @@
 \isakeyword{assumes} and \isakeyword{shows} elements which allow direct
 naming of assumptions:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ AB{\isacharcolon}\ {\isachardoublequote}large{\isacharunderscore}A\ {\isasymand}\ large{\isacharunderscore}B{\isachardoublequote}\isanewline
 \ \ \isakeyword{shows}\ {\isachardoublequote}large{\isacharunderscore}B\ {\isasymand}\ large{\isacharunderscore}A{\isachardoublequote}\ {\isacharparenleft}\isakeyword{is}\ {\isachardoublequote}{\isacharquery}B\ {\isasymand}\ {\isacharquery}A{\isachardoublequote}{\isacharparenright}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -509,7 +697,14 @@
 \isacommand{show}\ {\isachardoublequote}{\isacharquery}A{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Note the difference between \isa{{\isacharquery}AB}, a term, and
@@ -519,9 +714,15 @@
 don't have to perform it twice, as above. Here is a slick way to
 achieve this:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ AB{\isacharcolon}\ {\isachardoublequote}large{\isacharunderscore}A\ {\isasymand}\ large{\isacharunderscore}B{\isachardoublequote}\isanewline
 \ \ \isakeyword{shows}\ {\isachardoublequote}large{\isacharunderscore}B\ {\isasymand}\ large{\isacharunderscore}A{\isachardoublequote}\ {\isacharparenleft}\isakeyword{is}\ {\isachardoublequote}{\isacharquery}B\ {\isasymand}\ {\isacharquery}A{\isachardoublequote}{\isacharparenright}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{using}\ AB\isanewline
 \isamarkupfalse%
@@ -531,7 +732,14 @@
 \isacommand{show}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Command \isakeyword{using} can appear before a proof
@@ -550,8 +758,14 @@
 trigger $\lor$-introduction, requiring us to prove \isa{A}. A simple
 ``\isa{{\isacharminus}}'' prevents this \emph{faux pas}:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ AB{\isacharcolon}\ {\isachardoublequote}A\ {\isasymor}\ B{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}B\ {\isasymor}\ A{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
@@ -572,7 +786,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \isamarkupsubsection{Predicate calculus%
 }
@@ -586,8 +807,14 @@
 \isa{{\isasymLongrightarrow}}. Here is a sample proof, annotated with the rules that are
 applied implicitly:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ P{\isacharcolon}\ {\isachardoublequote}{\isasymforall}x{\isachardot}\ P\ x{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isasymforall}x{\isachardot}\ P{\isacharparenleft}f\ x{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ %
 \isamarkupcmt{\isa{allI}: \isa{{\isacharparenleft}{\isasymAnd}x{\isachardot}\ {\isacharquery}P\ x{\isacharparenright}\ {\isasymLongrightarrow}\ {\isasymforall}x{\isachardot}\ {\isacharquery}P\ x}%
@@ -603,7 +830,14 @@
 }
 \isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Note that in the proof we have chosen to call the bound
@@ -612,8 +846,14 @@
 
 Next we look at \isa{{\isasymexists}} which is a bit more tricky.%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ Pf{\isacharcolon}\ {\isachardoublequote}{\isasymexists}x{\isachardot}\ P{\isacharparenleft}f\ x{\isacharparenright}{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isasymexists}y{\isachardot}\ P\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
@@ -637,7 +877,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Explicit $\exists$-elimination as seen above can become
@@ -645,8 +892,14 @@
 \isakeyword{obtain} provides a more appealing form of generalised
 existence reasoning:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ Pf{\isacharcolon}\ {\isachardoublequote}{\isasymexists}x{\isachardot}\ P{\isacharparenleft}f\ x{\isacharparenright}{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isasymexists}y{\isachardot}\ P\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
@@ -657,7 +910,14 @@
 \isacommand{thus}\ {\isachardoublequote}{\isasymexists}y{\isachardot}\ P\ y{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Note how the proof text follows the usual mathematical style
@@ -669,8 +929,14 @@
 Here is a proof of a well known tautology.
 Which rule is used where?%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ ex{\isacharcolon}\ {\isachardoublequote}{\isasymexists}x{\isachardot}\ {\isasymforall}y{\isachardot}\ P\ x\ y{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isasymforall}y{\isachardot}\ {\isasymexists}x{\isachardot}\ P\ x\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -686,7 +952,14 @@
 \isacommand{thus}\ {\isachardoublequote}{\isasymexists}x{\isachardot}\ P\ x\ y{\isachardoublequote}\ \isamarkupfalse%
 \isacommand{{\isachardot}{\isachardot}}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \isamarkupsubsection{Making bigger steps%
 }
@@ -698,8 +971,14 @@
 Cantor's theorem that there is no surjective function from a set to its
 powerset:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{theorem}\ {\isachardoublequote}{\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ {\isacharparenleft}f\ {\isacharcolon}{\isacharcolon}\ {\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -737,7 +1016,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
@@ -758,8 +1044,14 @@
 consumption, here is a more detailed version; the beginning up to
 \isakeyword{obtain} stays unchanged.%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{theorem}\ {\isachardoublequote}{\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ {\isacharparenleft}f\ {\isacharcolon}{\isacharcolon}\ {\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -807,7 +1099,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Method \isa{contradiction} succeeds if both $P$ and
@@ -817,10 +1116,23 @@
 search. Depth-first search would diverge, but best-first search successfully
 navigates through the large search space:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{theorem}\ {\isachardoublequote}{\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ {\isacharparenleft}f\ {\isacharcolon}{\isacharcolon}\ {\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isacharparenright}{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
-\isacommand{by}\ best\isamarkupfalse%
+\isacommand{by}\ best%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \isamarkupsubsection{Raw proof blocks%
 }
@@ -832,9 +1144,27 @@
 tendency to use the default introduction and elimination rules to
 decompose goals and facts. This can lead to very tedious proofs:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+%
+\isadelimML
+%
+\endisadelimML
+%
+\isatagML
+%
+\endisatagML
+{\isafoldML}%
+%
+\isadelimML
+%
+\endisadelimML
 \isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isasymforall}x\ y{\isachardot}\ A\ x\ y\ {\isasymand}\ B\ x\ y\ {\isasymlongrightarrow}\ C\ x\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -857,7 +1187,14 @@
 \ \ \isamarkupfalse%
 \isacommand{qed}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent Since we are only interested in the decomposition and not the
@@ -868,8 +1205,14 @@
 
 Luckily we can avoid this step by step decomposition very easily:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isasymforall}x\ y{\isachardot}\ A\ x\ y\ {\isasymand}\ B\ x\ y\ {\isasymlongrightarrow}\ C\ x\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
@@ -888,15 +1231,28 @@
 \isacommand{thus}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{by}\ blast\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent
 This can be simplified further by \emph{raw proof blocks}, i.e.\
 proofs enclosed in braces:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}{\isasymforall}x\ y{\isachardot}\ A\ x\ y\ {\isasymand}\ B\ x\ y\ {\isasymlongrightarrow}\ C\ x\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
@@ -911,7 +1267,14 @@
 \isacommand{thus}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{by}\ blast\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent The result of the raw proof block is the same theorem
@@ -943,14 +1306,18 @@
 that each case $P_i$ implies the goal. Taken together, this proves the
 goal. The corresponding Isar proof pattern (for $n = 3$) is very handy:%
 \end{isamarkuptext}%
-\isamarkuptrue%
 %
 \renewcommand{\isamarkupcmt}[1]{#1}
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
-\isacommand{have}\ {\isachardoublequote}P\isactrlisub {\isadigit{1}}\ {\isasymor}\ P\isactrlisub {\isadigit{2}}\ {\isasymor}\ P\isactrlisub {\isadigit{3}}{\isachardoublequote}\ \isamarkupfalse%
-\ %
+\isacommand{have}\ {\isachardoublequote}P\isactrlisub {\isadigit{1}}\ {\isasymor}\ P\isactrlisub {\isadigit{2}}\ {\isasymor}\ P\isactrlisub {\isadigit{3}}{\isachardoublequote}\ \ %
 \isamarkupcmt{\dots%
 }
 \isanewline
@@ -964,8 +1331,7 @@
 }
 \isanewline
 \ \ \ \ \isamarkupfalse%
-\isacommand{have}\ {\isacharquery}thesis\ \isamarkupfalse%
-\ %
+\isacommand{have}\ {\isacharquery}thesis\ \ %
 \isamarkupcmt{\dots%
 }
 \ \isamarkupfalse%
@@ -980,8 +1346,7 @@
 }
 \isanewline
 \ \ \ \ \isamarkupfalse%
-\isacommand{have}\ {\isacharquery}thesis\ \isamarkupfalse%
-\ %
+\isacommand{have}\ {\isacharquery}thesis\ \ %
 \isamarkupcmt{\dots%
 }
 \ \isamarkupfalse%
@@ -996,8 +1361,7 @@
 }
 \isanewline
 \ \ \ \ \isamarkupfalse%
-\isacommand{have}\ {\isacharquery}thesis\ \isamarkupfalse%
-\ %
+\isacommand{have}\ {\isacharquery}thesis\ \ %
 \isamarkupcmt{\dots%
 }
 \ \isamarkupfalse%
@@ -1007,9 +1371,16 @@
 \isacommand{show}\ {\isacharquery}thesis\ \isamarkupfalse%
 \isacommand{by}\ blast\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
 %
 \renewcommand{\isamarkupcmt}[1]{{\isastylecmt--- #1}}
+\isamarkuptrue%
 %
 \isamarkupsubsection{Further refinements%
 }
@@ -1065,32 +1436,69 @@
 to make the theorem less readable. The situation can be improved a
 little by combining the type constraint with an outer \isa{{\isasymAnd}}:%
 \end{isamarkuptext}%
+\isamarkupfalse%
+\isacommand{theorem}\ {\isachardoublequote}{\isasymAnd}f\ {\isacharcolon}{\isacharcolon}\ {\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isachardot}\ {\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ f{\isachardoublequote}%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
+%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
 \isamarkuptrue%
-\isacommand{theorem}\ {\isachardoublequote}{\isasymAnd}f\ {\isacharcolon}{\isacharcolon}\ {\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isachardot}\ {\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ f{\isachardoublequote}\isamarkupfalse%
-\isamarkupfalse%
 %
 \begin{isamarkuptext}%
 \noindent However, now \isa{f} is bound and we need a
 \isakeyword{fix}~\isa{f} in the proof before we can refer to \isa{f}.
 This is avoided by \isakeyword{fixes}:%
 \end{isamarkuptext}%
+\isamarkupfalse%
+\isacommand{theorem}\ \isakeyword{fixes}\ f\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ f{\isachardoublequote}%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
+%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
 \isamarkuptrue%
-\isacommand{theorem}\ \isakeyword{fixes}\ f\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ set{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}{\isasymexists}S{\isachardot}\ S\ {\isasymnotin}\ range\ f{\isachardoublequote}\isamarkupfalse%
-\isamarkupfalse%
 %
 \begin{isamarkuptext}%
 \noindent
 Even better, \isakeyword{fixes} allows to introduce concrete syntax locally:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ comm{\isacharunderscore}mono{\isacharcolon}\isanewline
 \ \ \isakeyword{fixes}\ r\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ {\isasymRightarrow}\ bool{\isachardoublequote}\ {\isacharparenleft}\isakeyword{infix}\ {\isachardoublequote}{\isachargreater}{\isachardoublequote}\ {\isadigit{6}}{\isadigit{0}}{\isacharparenright}\ \isakeyword{and}\isanewline
 \ \ \ \ \ \ \ f\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a\ {\isasymRightarrow}\ {\isacharprime}a{\isachardoublequote}\ \ \ {\isacharparenleft}\isakeyword{infixl}\ {\isachardoublequote}{\isacharplus}{\isacharplus}{\isachardoublequote}\ {\isadigit{7}}{\isadigit{0}}{\isacharparenright}\isanewline
 \ \ \isakeyword{assumes}\ comm{\isacharcolon}\ {\isachardoublequote}{\isasymAnd}x\ y{\isacharcolon}{\isacharcolon}{\isacharprime}a{\isachardot}\ x\ {\isacharplus}{\isacharplus}\ y\ {\isacharequal}\ y\ {\isacharplus}{\isacharplus}\ x{\isachardoublequote}\ \isakeyword{and}\isanewline
 \ \ \ \ \ \ \ \ \ \ mono{\isacharcolon}\ {\isachardoublequote}{\isasymAnd}x\ y\ z{\isacharcolon}{\isacharcolon}{\isacharprime}a{\isachardot}\ x\ {\isachargreater}\ y\ {\isasymLongrightarrow}\ x\ {\isacharplus}{\isacharplus}\ z\ {\isachargreater}\ y\ {\isacharplus}{\isacharplus}\ z{\isachardoublequote}\isanewline
 \ \ \isakeyword{shows}\ {\isachardoublequote}x\ {\isachargreater}\ y\ {\isasymLongrightarrow}\ z\ {\isacharplus}{\isacharplus}\ x\ {\isachargreater}\ z\ {\isacharplus}{\isacharplus}\ y{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
-\isacommand{by}{\isacharparenleft}simp\ add{\isacharcolon}\ comm\ mono{\isacharparenright}\isamarkupfalse%
+\isacommand{by}{\isacharparenleft}simp\ add{\isacharcolon}\ comm\ mono{\isacharparenright}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent The concrete syntax is dropped at the end of the proof and the
@@ -1111,15 +1519,27 @@
 The \isakeyword{obtain} construct can introduce multiple
 witnesses and propositions as in the following proof fragment:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ \isakeyword{assumes}\ A{\isacharcolon}\ {\isachardoublequote}{\isasymexists}x\ y{\isachardot}\ P\ x\ y\ {\isasymand}\ Q\ x\ y{\isachardoublequote}\ \isakeyword{shows}\ {\isachardoublequote}R{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ \isamarkupfalse%
 \isacommand{from}\ A\ \isamarkupfalse%
 \isacommand{obtain}\ x\ y\ \isakeyword{where}\ P{\isacharcolon}\ {\isachardoublequote}P\ x\ y{\isachardoublequote}\ \isakeyword{and}\ Q{\isacharcolon}\ {\isachardoublequote}Q\ x\ y{\isachardoublequote}\ \ \isamarkupfalse%
-\isacommand{by}\ blast\isamarkupfalse%
-\isamarkupfalse%
+\isacommand{by}\ blast%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 Remember also that one does not even need to start with a formula
@@ -1136,8 +1556,14 @@
 \cite{LNCS2283}) may appear in the leaves of the proof tree, although this is
 best avoided.  Here is a contrived example:%
 \end{isamarkuptext}%
-\isamarkuptrue%
+\isamarkupfalse%
 \isacommand{lemma}\ {\isachardoublequote}A\ {\isasymlongrightarrow}\ {\isacharparenleft}A\ {\isasymlongrightarrow}\ B{\isacharparenright}\ {\isasymlongrightarrow}\ B{\isachardoublequote}\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\isanewline
 \ \ \isamarkupfalse%
@@ -1155,7 +1581,14 @@
 \ \ \ \ \isamarkupfalse%
 \isacommand{done}\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \noindent You may need to resort to this technique if an
@@ -1165,8 +1598,19 @@
 in a top-down manner: parts of the proof can be left in script form
 while the outer structure is already expressed in Isar.%
 \end{isamarkuptext}%
-\isamarkuptrue%
-\isamarkupfalse%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+%
+\isatagtheory
+%
+\endisatagtheory
+{\isafoldtheory}%
+%
+\isadelimtheory
+%
+\endisadelimtheory
 \end{isabellebody}%
 %%% Local Variables:
 %%% mode: latex
diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/IsarOverview/Isar/document/isabelle.sty
--- a/doc-src/IsarOverview/Isar/document/isabelle.sty	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/IsarOverview/Isar/document/isabelle.sty	Fri Aug 19 10:50:05 2005 +0200
@@ -22,10 +22,10 @@
 \newcommand{\isamath}[1]{\emph{$#1$}}
 \newcommand{\isatext}[1]{\emph{#1}}
 \newcommand{\isascriptstyle}{\def\isamath##1{##1}\def\isatext##1{\mbox{\isastylescript##1}}}
-\newcommand{\isactrlsub}[1]{\emph{\isascriptstyle${}\sb{#1}$}}
-\newcommand{\isactrlsup}[1]{\emph{\isascriptstyle${}\sp{#1}$}}
-\newcommand{\isactrlisub}[1]{\emph{\isascriptstyle${}\sb{#1}$}}
-\newcommand{\isactrlisup}[1]{\emph{\isascriptstyle${}\sp{#1}$}}
+\newcommand{\isactrlsub}[1]{\emph{${}\sb{\mbox{\isastylescript{#1}}}$}}
+\newcommand{\isactrlsup}[1]{\emph{${}\sp{\mbox{\isastylescript{#1}}}$}}
+\newcommand{\isactrlisub}[1]{\emph{${}\sb{\mbox{\isastylescript{#1}}}$}}
+\newcommand{\isactrlisup}[1]{\emph{${}\sp{\mbox{\isastylescript{#1}}}$}}
 \newcommand{\isactrlbsub}{\emph\bgroup\begin{math}{}\sb\bgroup\mbox\bgroup\isastylescript}
 \newcommand{\isactrlesub}{\egroup\egroup\end{math}\egroup}
 \newcommand{\isactrlbsup}{\emph\bgroup\begin{math}{}\sp\bgroup\mbox\bgroup\isastylescript}
@@ -149,6 +149,7 @@
 \renewcommand{\isachargreater}{\isamath{>}}%
 \renewcommand{\isacharat}{\isamath{@}}%
 \renewcommand{\isacharbrackleft}{\isamath{[}}%
+\renewcommand{\isacharbackslash}{\isamath{\backslash}}%
 \renewcommand{\isacharbrackright}{\isamath{]}}%
 \renewcommand{\isacharunderscore}{\mbox{-}}%
 \renewcommand{\isacharbraceleft}{\isamath{\{}}%
@@ -163,3 +164,28 @@
 \renewcommand{\isastyleminor}{\sl}%
 \renewcommand{\isastylescript}{\footnotesize\sl}%
 }
+
+
+% tagged regions
+
+%plain TeX version of comment package -- much faster!
+\let\isafmtname\fmtname\def\fmtname{plain}
+\usepackage{comment}
+\let\fmtname\isafmtname
+
+\newcommand{\isafold}[1]{\emph{$\langle\mathord{\mathit{#1}}\rangle$}}
+
+\newcommand{\isakeeptag}[1]%
+{\includecomment{isadelim#1}\includecomment{isatag#1}\csarg\def{isafold#1}{}}
+\newcommand{\isadroptag}[1]%
+{\excludecomment{isadelim#1}\excludecomment{isatag#1}\csarg\def{isafold#1}{}}
+\newcommand{\isafoldtag}[1]%
+{\includecomment{isadelim#1}\excludecomment{isatag#1}\csarg\def{isafold#1}{\isafold{#1}}}
+
+\isakeeptag{theory}
+\isakeeptag{proof}
+\isakeeptag{ML}
+\isakeeptag{visible}
+\isadroptag{invisible}
+
+\IfFileExists{isabelletags.sty}{\usepackage{isabelletags}}{}
diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/IsarOverview/Isar/document/isabellesym.sty
--- a/doc-src/IsarOverview/Isar/document/isabellesym.sty	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/IsarOverview/Isar/document/isabellesym.sty	Fri Aug 19 10:50:05 2005 +0200
@@ -359,3 +359,4 @@
 \newcommand{\isasymcedilla}{\isatext{\c\relax}}
 \newcommand{\isasymhungarumlaut}{\isatext{\H\relax}}
 \newcommand{\isasymspacespace}{\isamath{~~}}
+\newcommand{\isasymmodule}{\isamath{\langle}\isakeyword{module}\isamath{\rangle}}
diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/LaTeXsugar/Sugar/document/Sugar.tex
--- a/doc-src/LaTeXsugar/Sugar/document/Sugar.tex	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/LaTeXsugar/Sugar/document/Sugar.tex	Fri Aug 19 10:50:05 2005 +0200
@@ -1,7 +1,20 @@
 %
 \begin{isabellebody}%
 \def\isabellecontext{Sugar}%
-\isamarkupfalse%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+%
+\isatagtheory
+%
+\endisatagtheory
+{\isafoldtheory}%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+\isamarkuptrue%
 %
 \isamarkupsection{Introduction%
 }
@@ -150,8 +163,20 @@
 internal index. This can be avoided by turning the last digit into a
 subscript: write \verb!x\<^isub>1! and obtain the much nicer \isa{x\isactrlisub {\isadigit{1}}}.%
 \end{isamarkuptext}%
+%
+\isadelimML
+%
+\endisadelimML
+%
+\isatagML
+%
+\endisatagML
+{\isafoldML}%
+%
+\isadelimML
+%
+\endisadelimML
 \isamarkuptrue%
-\isamarkupfalse%
 %
 \isamarkupsubsection{Variable names%
 }
@@ -329,12 +354,18 @@
   \ref{fig:proof}. This was achieved with the \isakeyword{text\_raw}
   command:%
 \end{isamarkuptext}%
-\isamarkuptrue%
 %
 \begin{figure}
   \begin{center}\begin{minipage}{0.6\textwidth}  
   \isastyle\isamarkuptrue
+\isamarkupfalse%
 \isacommand{lemma}\ True\isanewline
+%
+\isadelimproof
+%
+\endisadelimproof
+%
+\isatagproof
 \isamarkupfalse%
 \isacommand{proof}\ {\isacharminus}\isanewline
 \ \ %
@@ -345,11 +376,18 @@
 \isacommand{show}\ True\ \isamarkupfalse%
 \isacommand{by}\ force\isanewline
 \isamarkupfalse%
-\isacommand{qed}\isamarkupfalse%
+\isacommand{qed}%
+\endisatagproof
+{\isafoldproof}%
+%
+\isadelimproof
+%
+\endisadelimproof
 %
 \end{minipage}\end{center}
   \caption{Example proof in a figure.}\label{fig:proof}
   \end{figure}
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \begin{quote}
@@ -420,19 +458,22 @@
   Likewise, \verb!concl! may be used as a style to show just the
   conclusion of a proposition. For example, take \verb!hd_Cons_tl!:
   \begin{center}
-    \isa{xs\ {\isasymnoteq}\ {\isacharbrackleft}{\isacharbrackright}\ {\isasymLongrightarrow}\ hd\ xs{\isasymcdot}tl\ xs\ {\isacharequal}\ xs}
+    \isa{{\isacharparenleft}xs{\isasymColon}{\isacharprime}a\ list{\isacharparenright}\ {\isasymnoteq}\ {\isacharbrackleft}{\isacharbrackright}\ {\isasymLongrightarrow}\ hd\ xs{\isasymcdot}tl\ xs\ {\isacharequal}\ xs}
   \end{center}
   To print just the conclusion,
   \begin{center}
-    \isa{hd\ xs{\isasymcdot}tl\ xs\ {\isacharequal}\ xs}
+    \isa{hd\ {\isacharparenleft}xs{\isasymColon}{\isacharprime}a\ list{\isacharparenright}{\isasymcdot}tl\ xs\ {\isacharequal}\ xs}
   \end{center}
   type
   \begin{quote}
     \verb!\begin{center}!\\
-    \verb!@!\verb!{thm_style concl hd_Cons_tl}!\\
+    \verb!@!\verb!{thm_style [show_types] concl hd_Cons_tl}!\\
     \verb!\end{center}!
   \end{quote}
 
+  Be aware that any options must be placed \emph{before}
+  the name of the style, as in this example.
+
   Further use cases can be found in \S\ref{sec:yourself}.
 
   If you are not afraid of ML, you may also define your own styles.
@@ -440,8 +481,20 @@
   \verb!Proof.context -> term -> term!.
   Have a look at the following example:%
 \end{isamarkuptext}%
+%
+\isadelimML
+%
+\endisadelimML
+%
+\isatagML
+%
+\endisatagML
+{\isafoldML}%
+%
+\isadelimML
+%
+\endisadelimML
 \isamarkuptrue%
-\isamarkupfalse%
 %
 \begin{isamarkuptext}%
 \begin{quote}
@@ -464,7 +517,7 @@
   style has some object-logic specific behaviour for example.
 
   The mapping from identifier name to the style function
-  is done by the \isa{TermStyle{\isachardot}add{\isacharunderscore}style} expression which expects the desired
+  is done by the \verb|TermStyle.add_style| expression which expects the desired
   style name and the style function as arguments.
   
   After this \verb!setup!,
@@ -472,8 +525,19 @@
   antiquoations like \verb!@!\verb!{thm_style my_concl hd_Cons_tl}!
   yielding \isa{hd\ xs{\isasymcdot}tl\ xs\ {\isacharequal}\ xs}.%
 \end{isamarkuptext}%
-\isamarkuptrue%
-\isamarkupfalse%
+%
+\isadelimtheory
+%
+\endisadelimtheory
+%
+\isatagtheory
+%
+\endisatagtheory
+{\isafoldtheory}%
+%
+\isadelimtheory
+%
+\endisadelimtheory
 \end{isabellebody}%
 %%% Local Variables:
 %%% mode: latex
diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/LaTeXsugar/Sugar/document/isabelle.sty
--- a/doc-src/LaTeXsugar/Sugar/document/isabelle.sty	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/LaTeXsugar/Sugar/document/isabelle.sty	Fri Aug 19 10:50:05 2005 +0200
@@ -22,10 +22,10 @@
 \newcommand{\isamath}[1]{\emph{$#1$}}
 \newcommand{\isatext}[1]{\emph{#1}}
 \newcommand{\isascriptstyle}{\def\isamath##1{##1}\def\isatext##1{\mbox{\isastylescript##1}}}
-\newcommand{\isactrlsub}[1]{\emph{\isascriptstyle${}\sb{#1}$}}
-\newcommand{\isactrlsup}[1]{\emph{\isascriptstyle${}\sp{#1}$}}
-\newcommand{\isactrlisub}[1]{\emph{\isascriptstyle${}\sb{#1}$}}
-\newcommand{\isactrlisup}[1]{\emph{\isascriptstyle${}\sp{#1}$}}
+\newcommand{\isactrlsub}[1]{\emph{${}\sb{\mbox{\isastylescript{#1}}}$}}
+\newcommand{\isactrlsup}[1]{\emph{${}\sp{\mbox{\isastylescript{#1}}}$}}
+\newcommand{\isactrlisub}[1]{\emph{${}\sb{\mbox{\isastylescript{#1}}}$}}
+\newcommand{\isactrlisup}[1]{\emph{${}\sp{\mbox{\isastylescript{#1}}}$}}
 \newcommand{\isactrlbsub}{\emph\bgroup\begin{math}{}\sb\bgroup\mbox\bgroup\isastylescript}
 \newcommand{\isactrlesub}{\egroup\egroup\end{math}\egroup}
 \newcommand{\isactrlbsup}{\emph\bgroup\begin{math}{}\sp\bgroup\mbox\bgroup\isastylescript}
@@ -149,6 +149,7 @@
 \renewcommand{\isachargreater}{\isamath{>}}%
 \renewcommand{\isacharat}{\isamath{@}}%
 \renewcommand{\isacharbrackleft}{\isamath{[}}%
+\renewcommand{\isacharbackslash}{\isamath{\backslash}}%
 \renewcommand{\isacharbrackright}{\isamath{]}}%
 \renewcommand{\isacharunderscore}{\mbox{-}}%
 \renewcommand{\isacharbraceleft}{\isamath{\{}}%
@@ -163,3 +164,28 @@
 \renewcommand{\isastyleminor}{\sl}%
 \renewcommand{\isastylescript}{\footnotesize\sl}%
 }
+
+
+% tagged regions
+
+%plain TeX version of comment package -- much faster!
+\let\isafmtname\fmtname\def\fmtname{plain}
+\usepackage{comment}
+\let\fmtname\isafmtname
+
+\newcommand{\isafold}[1]{\emph{$\langle\mathord{\mathit{#1}}\rangle$}}
+
+\newcommand{\isakeeptag}[1]%
+{\includecomment{isadelim#1}\includecomment{isatag#1}\csarg\def{isafold#1}{}}
+\newcommand{\isadroptag}[1]%
+{\excludecomment{isadelim#1}\excludecomment{isatag#1}\csarg\def{isafold#1}{}}
+\newcommand{\isafoldtag}[1]%
+{\includecomment{isadelim#1}\excludecomment{isatag#1}\csarg\def{isafold#1}{\isafold{#1}}}
+
+\isakeeptag{theory}
+\isakeeptag{proof}
+\isakeeptag{ML}
+\isakeeptag{visible}
+\isadroptag{invisible}
+
+\IfFileExists{isabelletags.sty}{\usepackage{isabelletags}}{}
diff -r 19ea4a0f4ec9 -r e6a82d1a1829 doc-src/LaTeXsugar/Sugar/document/isabellesym.sty
--- a/doc-src/LaTeXsugar/Sugar/document/isabellesym.sty	Fri Aug 19 09:40:44 2005 +0200
+++ b/doc-src/LaTeXsugar/Sugar/document/isabellesym.sty	Fri Aug 19 10:50:05 2005 +0200
@@ -359,3 +359,4 @@
 \newcommand{\isasymcedilla}{\isatext{\c\relax}}
 \newcommand{\isasymhungarumlaut}{\isatext{\H\relax}}
 \newcommand{\isasymspacespace}{\isamath{~~}}
+\newcommand{\isasymmodule}{\isamath{\langle}\isakeyword{module}\isamath{\rangle}}