
diff -r 93d5408eb7d9 -r fbd097aec213 doc-src/TutorialI/ToyList/document/ToyList.tex
--- a/doc-src/TutorialI/ToyList/document/ToyList.tex	Sun Oct 21 19:48:19 2001 +0200
+++ b/doc-src/TutorialI/ToyList/document/ToyList.tex	Sun Oct 21 19:49:29 2001 +0200
@@ -1,7 +1,8 @@
 %
 \begin{isabellebody}%
 \def\isabellecontext{ToyList}%
-\isacommand{theory}\ ToyList\ {\isacharequal}\ PreList{\isacharcolon}%
+\isacommand{theory}\ ToyList\ {\isacharequal}\ PreList{\isacharcolon}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 HOL already has a predefined theory of lists called \isa{List} ---
@@ -11,8 +12,10 @@
 theory that contains pretty much everything but lists, thus avoiding
 ambiguities caused by defining lists twice.%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{datatype}\ {\isacharprime}a\ list\ {\isacharequal}\ Nil\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\isacharparenleft}{\isachardoublequote}{\isacharbrackleft}{\isacharbrackright}{\isachardoublequote}{\isacharparenright}\isanewline
-\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\isacharbar}\ Cons\ {\isacharprime}a\ {\isachardoublequote}{\isacharprime}a\ list{\isachardoublequote}\ \ \ \ \ \ \ \ \ \ \ \ {\isacharparenleft}\isakeyword{infixr}\ {\isachardoublequote}{\isacharhash}{\isachardoublequote}\ {\isadigit{6}}{\isadigit{5}}{\isacharparenright}%
+\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\isacharbar}\ Cons\ {\isacharprime}a\ {\isachardoublequote}{\isacharprime}a\ list{\isachardoublequote}\ \ \ \ \ \ \ \ \ \ \ \ {\isacharparenleft}\isakeyword{infixr}\ {\isachardoublequote}{\isacharhash}{\isachardoublequote}\ {\isadigit{6}}{\isadigit{5}}{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 \index{datatype@\isacommand {datatype} (command)}
@@ -44,8 +47,10 @@
 \end{warn}
 Next, two functions \isa{app} and \cdx{rev} are declared:%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{consts}\ app\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list{\isachardoublequote}\ \ \ {\isacharparenleft}\isakeyword{infixr}\ {\isachardoublequote}{\isacharat}{\isachardoublequote}\ {\isadigit{6}}{\isadigit{5}}{\isacharparenright}\isanewline
-\ \ \ \ \ \ \ rev\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list{\isachardoublequote}%
+\ \ \ \ \ \ \ rev\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a\ list{\isachardoublequote}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 In contrast to many functional programming languages,
@@ -57,13 +62,16 @@
 \isa{xs\ {\isacharat}\ ys}\index{$HOL2list@\texttt{\at}|bold} becomes the preferred
 form. Both functions are defined recursively:%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{primrec}\isanewline
 {\isachardoublequote}{\isacharbrackleft}{\isacharbrackright}\ {\isacharat}\ ys\ \ \ \ \ \ \ {\isacharequal}\ ys{\isachardoublequote}\isanewline
 {\isachardoublequote}{\isacharparenleft}x\ {\isacharhash}\ xs{\isacharparenright}\ {\isacharat}\ ys\ {\isacharequal}\ x\ {\isacharhash}\ {\isacharparenleft}xs\ {\isacharat}\ ys{\isacharparenright}{\isachardoublequote}\isanewline
 \isanewline
+\isamarkupfalse%
 \isacommand{primrec}\isanewline
 {\isachardoublequote}rev\ {\isacharbrackleft}{\isacharbrackright}\ \ \ \ \ \ \ \ {\isacharequal}\ {\isacharbrackleft}{\isacharbrackright}{\isachardoublequote}\isanewline
-{\isachardoublequote}rev\ {\isacharparenleft}x\ {\isacharhash}\ xs{\isacharparenright}\ \ {\isacharequal}\ {\isacharparenleft}rev\ xs{\isacharparenright}\ {\isacharat}\ {\isacharparenleft}x\ {\isacharhash}\ {\isacharbrackleft}{\isacharbrackright}{\isacharparenright}{\isachardoublequote}%
+{\isachardoublequote}rev\ {\isacharparenleft}x\ {\isacharhash}\ xs{\isacharparenright}\ \ {\isacharequal}\ {\isacharparenleft}rev\ xs{\isacharparenright}\ {\isacharat}\ {\isacharparenleft}x\ {\isacharhash}\ {\isacharbrackleft}{\isacharbrackright}{\isacharparenright}{\isachardoublequote}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent\index{*rev (constant)|(}\index{append function|(}
 The equations for \isa{app} and \isa{rev} hardly need comments:
@@ -102,7 +110,9 @@
 To lessen this burden, quotation marks around a single identifier can be
 dropped, unless the identifier happens to be a keyword, as in%
 \end{isamarkuptext}%
-\isacommand{consts}\ {\isachardoublequote}end{\isachardoublequote}\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a{\isachardoublequote}%
+\isamarkuptrue%
+\isacommand{consts}\ {\isachardoublequote}end{\isachardoublequote}\ {\isacharcolon}{\isacharcolon}\ {\isachardoublequote}{\isacharprime}a\ list\ {\isasymRightarrow}\ {\isacharprime}a{\isachardoublequote}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 When Isabelle prints a syntax error message, it refers to the HOL syntax as
@@ -122,7 +132,9 @@
 Our goal is to show that reversing a list twice produces the original
 list.%
 \end{isamarkuptext}%
-\isacommand{theorem}\ rev{\isacharunderscore}rev\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}rev\ xs{\isacharparenright}\ {\isacharequal}\ xs{\isachardoublequote}%
+\isamarkuptrue%
+\isacommand{theorem}\ rev{\isacharunderscore}rev\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}rev\ xs{\isacharparenright}\ {\isacharequal}\ xs{\isachardoublequote}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \index{theorem@\isacommand {theorem} (command)|bold}%
 \noindent
@@ -169,7 +181,9 @@
 defined functions are best established by induction. In this case there is
 nothing obvious except induction on \isa{xs}:%
 \end{isamarkuptxt}%
-\isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}%
+\isamarkuptrue%
+\isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \noindent\index{*induct_tac (method)}%
 This tells Isabelle to perform induction on variable \isa{xs}. The suffix
@@ -203,7 +217,9 @@
 
 Let us try to solve both goals automatically:%
 \end{isamarkuptxt}%
-\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}%
+\isamarkuptrue%
+\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \noindent
 This command tells Isabelle to apply a proof strategy called
@@ -217,16 +233,21 @@
 \end{isabelle}
 In order to simplify this subgoal further, a lemma suggests itself.%
 \end{isamarkuptxt}%
+\isamarkuptrue%
+\isamarkupfalse%
 %
 \isamarkupsubsubsection{First Lemma%
 }
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 \indexbold{abandoning a proof}\indexbold{proofs!abandoning}
 After abandoning the above proof attempt (at the shell level type
 \commdx{oops}) we start a new proof:%
 \end{isamarkuptext}%
-\isacommand{lemma}\ rev{\isacharunderscore}app\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}xs\ {\isacharat}\ ys{\isacharparenright}\ {\isacharequal}\ {\isacharparenleft}rev\ ys{\isacharparenright}\ {\isacharat}\ {\isacharparenleft}rev\ xs{\isacharparenright}{\isachardoublequote}%
+\isamarkuptrue%
+\isacommand{lemma}\ rev{\isacharunderscore}app\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}xs\ {\isacharat}\ ys{\isacharparenright}\ {\isacharequal}\ {\isacharparenleft}rev\ ys{\isacharparenright}\ {\isacharat}\ {\isacharparenleft}rev\ xs{\isacharparenright}{\isachardoublequote}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \noindent The keywords \commdx{theorem} and
 \commdx{lemma} are interchangeable and merely indicate
@@ -237,12 +258,16 @@
 \isa{ys}. Because \isa{{\isacharat}} is defined by recursion on
 the first argument, \isa{xs} is the correct one:%
 \end{isamarkuptxt}%
-\isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}%
+\isamarkuptrue%
+\isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \noindent
 This time not even the base case is solved automatically:%
 \end{isamarkuptxt}%
-\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}%
+\isamarkuptrue%
+\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \begin{isabelle}%
 \ {\isadigit{1}}{\isachardot}\ rev\ ys\ {\isacharequal}\ rev\ ys\ {\isacharat}\ {\isacharbrackleft}{\isacharbrackright}%
@@ -251,16 +276,23 @@
 first. In the future the step of abandoning an incomplete proof before
 embarking on the proof of a lemma usually remains implicit.%
 \end{isamarkuptxt}%
+\isamarkuptrue%
+\isamarkupfalse%
 %
 \isamarkupsubsubsection{Second Lemma%
 }
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 We again try the canonical proof procedure:%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{lemma}\ app{\isacharunderscore}Nil{\isadigit{2}}\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}xs\ {\isacharat}\ {\isacharbrackleft}{\isacharbrackright}\ {\isacharequal}\ xs{\isachardoublequote}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isanewline
-\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}%
+\isamarkupfalse%
+\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \noindent
 It works, yielding the desired message \isa{No\ subgoals{\isacharbang}}:
@@ -270,7 +302,9 @@
 \end{isabelle}
 We still need to confirm that the proof is now finished:%
 \end{isamarkuptxt}%
-\isacommand{done}%
+\isamarkuptrue%
+\isacommand{done}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 As a result of that final \commdx{done}, Isabelle associates the lemma just proved
@@ -286,9 +320,13 @@
 
 Going back to the proof of the first lemma%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{lemma}\ rev{\isacharunderscore}app\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}xs\ {\isacharat}\ ys{\isacharparenright}\ {\isacharequal}\ {\isacharparenleft}rev\ ys{\isacharparenright}\ {\isacharat}\ {\isacharparenleft}rev\ xs{\isacharparenright}{\isachardoublequote}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isanewline
-\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}%
+\isamarkupfalse%
+\isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isamarkupfalse%
+%
 \begin{isamarkuptxt}%
 \noindent
 we find that this time \isa{auto} solves the base case, but the
@@ -306,41 +344,61 @@
 \end{isabelle}
 and the missing lemma is associativity of \isa{{\isacharat}}.%
 \end{isamarkuptxt}%
+\isamarkuptrue%
+\isamarkupfalse%
 %
 \isamarkupsubsubsection{Third Lemma%
 }
+\isamarkuptrue%
 %
 \begin{isamarkuptext}%
 Abandoning the previous attempt, the canonical proof procedure
 succeeds without further ado.%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{lemma}\ app{\isacharunderscore}assoc\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}{\isacharparenleft}xs\ {\isacharat}\ ys{\isacharparenright}\ {\isacharat}\ zs\ {\isacharequal}\ xs\ {\isacharat}\ {\isacharparenleft}ys\ {\isacharat}\ zs{\isacharparenright}{\isachardoublequote}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isanewline
-\isacommand{done}%
+\isamarkupfalse%
+\isacommand{done}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 Now we can prove the first lemma:%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{lemma}\ rev{\isacharunderscore}app\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}xs\ {\isacharat}\ ys{\isacharparenright}\ {\isacharequal}\ {\isacharparenleft}rev\ ys{\isacharparenright}\ {\isacharat}\ {\isacharparenleft}rev\ xs{\isacharparenright}{\isachardoublequote}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isanewline
-\isacommand{done}%
+\isamarkupfalse%
+\isacommand{done}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 Finally, we prove our main theorem:%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{theorem}\ rev{\isacharunderscore}rev\ {\isacharbrackleft}simp{\isacharbrackright}{\isacharcolon}\ {\isachardoublequote}rev{\isacharparenleft}rev\ xs{\isacharparenright}\ {\isacharequal}\ xs{\isachardoublequote}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}induct{\isacharunderscore}tac\ xs{\isacharparenright}\isanewline
+\isamarkupfalse%
 \isacommand{apply}{\isacharparenleft}auto{\isacharparenright}\isanewline
-\isacommand{done}%
+\isamarkupfalse%
+\isacommand{done}\isamarkupfalse%
+%
 \begin{isamarkuptext}%
 \noindent
 The final \commdx{end} tells Isabelle to close the current theory because
 we are finished with its development:%
 \index{*rev (constant)|)}\index{append function|)}%
 \end{isamarkuptext}%
+\isamarkuptrue%
 \isacommand{end}\isanewline
+\isamarkupfalse%
 \end{isabellebody}%
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