CTAN sync 202106260300

4 files changed, 0 insertions, 2456 deletions

diff --git a/macros/latex/contrib/seminar/src/sem-code.tex b/macros/latex/contrib/seminar/src/sem-code.tex
deleted file mode 100644
index 451baaeed7..0000000000
--- a/macros/latex/contrib/seminar/src/sem-code.tex
+++ /dev/null
@@ -1,110 +0,0 @@
-%% BEGIN sem-code.tex.
-\def\FileVersion{1.0}
-\def\FileDate{93/04/01}
-%%
-%% For printing documented code for seminar.sty.
-%%
-%% COPYRIGHT 1993, by Timothy Van Zandt, Timothy.VAN-ZANDT@insead.edu
-%%
-%%
-%% This file may be distributed and/or modified under the conditions of
-%% the LaTeX Project Public License, either version 1.2 of this license
-%% or (at your option) any later version.  The latest version of this
-%% license is in:
-%% 
-%%    http://www.latex-project.org/lppl.txt
-%% 
-%% and version 1.2 or later is part of all distributions of LaTeX version
-%% 1999/12/01 or later.
-%%
-%% This LaTeX file inputs seminar.doc and semlayer.doc,
-%% and prints the documented code.
-%%
-%% You must also have Frank Mittelbach's
-%%     doc.sty and gind.ist
-%% (available from ftp.uni-stuttgart.de), as well as my
-%%     tvz-hax.sty, tvz-code.sty and fancybox.sty
-%% (distributed with seminar.sty).
-%%
-%% gind.ist is for the index. I.e.,
-%%            makeindex -s gind.ist sem-code.idx
-%%
-%% STYLE OPTIONS:
-%%   `a4'       : For A4 paper.
-%%   `twoside'  : For two-sided printing.
-%%   `2up'      : For two-up printing. (Uses non-standard font magnifications.
-%%                                      See 2up.doc for details.)
-
-\documentstyle{tvz-code}
-
-\CheckVersion{seminar.doc}
-
-% Comment out to suppress generation of .idx file. Speeds things up.
-\MakeIndex
-
-% Include to suppress checksums for drafts:
-% \def\StopEventually#1{\let\Finale\relax}
-
-\MakeShortVerb\"
-
-\ShortMeta
-
-\begin{document}
-
-\def\thetitle{{\tt seminar.sty}: Documented Code}
-
-\begingroup
-  \renewcommand{\thefootnote}{\fnsymbol{footnote}}
-  \thispagestyle{empty}
-  \let\footnotesize\small
-  \let\footnoterule\relax
-  \setcounter{page}{0}
-  \null
-  \vfill
-  \begin{center}
-    {\Huge\bf seminar.sty}\\[10pt]
-    {\huge\bf A \bLaTeX{} style for slides and notes}\\[18pt]
-    {\huge\bf Documented Code}\par
-    \vskip 1cm
-    \large Timothy Van Zandt\\[2pt]
-    {\normalsize\tt Timothy.VAN-ZANDT@insead.edu}
-    \vskip 1cm
-    {\large \thefiledate\\ Version \fileversion\par}
-  \end{center}
-  \par
-\endgroup
-
-\vfill
-\begin{quote}
-"seminar.sty" is a \LaTeX{} document style for typesetting slides or
-transparencies, and accompanying notes.
-
-This is the documented code. There is also a {\em User's Guide}, which
-contains installation instructions.
-\end{quote}
-\vfill
-
-\clearpage
-
-\pagenumbering{roman}
-\thispagestyle{empty}
-\tableofcontents
-\clearpage
-\pagenumbering{arabic}
-
-\StopEventually{}
-\DocInput{seminar.doc}
-\Finale
-\clearpage
-
-\StopEventually{}
-\DocInput{semlayer.doc}
-\Finale
-\clearpage
-
-\DeleteShortMeta
-
-\PrintIndex
-
-\end{document}
-%% END sem-code.tex
diff --git a/macros/latex/contrib/seminar/src/sem-make.tex b/macros/latex/contrib/seminar/src/sem-make.tex
deleted file mode 100644
index 4a2f81365c..0000000000
--- a/macros/latex/contrib/seminar/src/sem-make.tex
+++ /dev/null
@@ -1,27 +0,0 @@
-%% BEGIN sem-make.tex
-%%
-%% A batch file for extracting the code from seminar.doc and semlayer.doc,
-%% using Frank Mittelbach's docstrip.tex utility.
-%% Tested with docstrip.tex V2.0r. Might not work with other versions.
-%%
-%% Run with TeX or LaTeX.
-%%
-%% This file may be distributed and/or modified under the conditions of
-%% the LaTeX Project Public License, either version 1.2 of this license
-%% or (at your option) any later version.  The latest version of this
-%% license is in:
-%% 
-%%    http://www.latex-project.org/lppl.txt
-%% 
-%% and version 1.2 or later is part of all distributions of LaTeX version
-%% 1999/12/01 or later.
-%%
-%%
-\def\batchfile{sem-make.tex}
-\input docstrip
-\preamble
-\endpreamble
-\processFile{seminar}{doc}{sty}{t}
-\processFile{semlayer}{doc}{sty}{t}
-%%
-%% END sem-make.tex
diff --git a/macros/latex/contrib/seminar/src/seminar.doc b/macros/latex/contrib/seminar/src/seminar.doc
deleted file mode 100644
index 5813afc3b8..0000000000
--- a/macros/latex/contrib/seminar/src/seminar.doc
+++ /dev/null
@@ -1,2048 +0,0 @@
-% BEGIN seminar.doc
-%%
-\def\fileversion{1.0}
-\def\filedate{93/04/01}
-%%
-%% LaTeX document style `seminar', for use with LaTeX v2.09.
-%% This is a style for typesetting notes and slides.
-%%
-%% COPYRIGHT 1993, by Timothy Van Zandt, Timothy.VAN-ZANDT@insead.edu
-%%
-%%
-%% This file may be distributed and/or modified under the conditions of
-%% the LaTeX Project Public License, either version 1.2 of this license
-%% or (at your option) any later version.  The latest version of this
-%% license is in:
-%% 
-%%    http://www.latex-project.org/lppl.txt
-%% 
-%% and version 1.2 or later is part of all distributions of LaTeX version
-%% 1999/12/01 or later.
-%%
-%%
-% **************************************************************************
-% This is `seminar.doc', the documented code for `seminar.sty'.
-% You can copy this to `seminar.sty' and use it as is.
-% You can also create a stripped input file `seminar.sty' using sem-make.tex.
-% You can print the documented code using sem-code.tex.
-% sem-make.tex and sem-code.tex are distributed with seminar.sty.
-% **************************************************************************
-%
-% \EndDocPreamble
-%
-% \CheckSum{3062}
-% \CharacterTable
-%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
-%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
-%   Digits        \0\1\2\3\4\5\6\7\8\9
-%   Exclamation   \!     Double quote  \"     Hash (number) \#
-%   Dollar        \$     Percent       \%     Ampersand     \&
-%   Acute accent  \'     Left paren    \(     Right paren   \)
-%   Asterisk      \*     Plus          \+     Comma         \,
-%   Minus         \-     Point         \.     Solidus       \/
-%   Colon         \:     Semicolon     \;     Less than     \<
-%   Equals        \=     Greater than  \>     Question mark \?
-%   Commercial at \@     Left bracket  \[     Backslash     \\
-%   Right bracket \]     Circumflex    \^     Underscore    \_
-%   Grave accent  \`     Left brace    \{     Vertical bar  \|
-%   Right brace   \}     Tilde         \~}
-%
-%
-% \section{Overview}
-%
-% In principle, a slides style is a simple matter; just a question of
-% resetting the magnification and changing a few page parameters. However,
-% allowing notes and slides to be put in the same file but treated
-% differently, and allowing everything to be printed in various formats,
-% complicates things a bit.
-%
-% The code starts by checking that the file is not loaded, and announcing the
-% file on the terminal.
-%    \begin{macrocode}
-\@ifundefined{@seminarerr}{}{\endinput}
-\typeout{%
-  Document Style: `seminar' v\fileversion \space <\filedate> (tvz)}
-%    \end{macrocode}
-%
-%
-% \section{Useful hacks}
-%
-% \begin{macro}{\test@member}
-% The second argument to "\test@member" is a comma-separated list.
-% "\test@member" checks whether the first argument is a member of this list
-% (after expanding both the list and the first argument), setting "\if@test"
-% appropriately.
-%    \begin{macrocode}
-\def\test@member#1#2{%
-  \edef\@tempg{,#2,#1,}%
-  \edef\@temph{####1,#1,}%
-  \expandafter\def\expandafter\@temph\@temph##2\@nil{%
-    \def\@tempg{##2}%
-    \ifx\@tempg\@empty\@testfalse\else\@testtrue\fi}%
-  \expandafter\@temph\@tempg\@nil}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\addto@hook}
-% The first argument of "\addto@hook" is a token register. "\addto@hook" adds
-% its second argument to this register. This is a standard macro in the Mainz
-% distribution,.
-%    \begin{macrocode}
-\def\addto@hook#1#2{#1\expandafter{\the#1#2}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\reset@font}
-% "\reset@font" is part of later releases of \LaTeX.
-%    \begin{macrocode}
-\@ifundefined{reset@font}{\def\reset@font{\normalsize\rm}}{}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@seminarerr}
-% "\@seminarerr" is analogous to "\@latexerr".
-%    \begin{macrocode}
-\def\@seminarerr#1#2{%
-  \edef\@tempc{#2}\expandafter\errhelp\expandafter{\@tempc}%
-  \typeout{^^JSeminar.sty error.\space\space\space
-    Type \space H <return> \space for immediate help.^^J}%
-  \errmessage{#1^^J}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\notslide@err}
-%    \begin{macrocode}
-\def\notslide@err#1{Cannot use \string#1 in slide environments}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\new@slidebox}
-% Since "\newbox" is "\outer".
-%    \begin{macrocode}
-\def\new@slidebox{\alloc@4\box\chardef\insc@unt}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidewidth,\slideheight}
-%    \begin{macrocode}
-\newdimen\slidewidth \slidewidth 8.5in
-\newdimen\slideheight \slideheight 6.3in
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\paperwidth,\paperheight}
-% "\paperwidth" and "\paperheight" are used by "sem-page.sty" to set the page
-% parameters. "\twoup" also uses the values.
-%    \begin{macrocode}
-\@ifundefined{paperwidth}{\def\paperwidth{8.5in}}{}
-\@ifundefined{paperheight}{\def\paperheight{11in}}{}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\addto@preamblecmds}
-% Various commands used in this style are added to "\@preamblecmds". This
-% macros makes it easier to do this as we go along. Argument is a list of
-% commands separated by "\do".
-%    \begin{macrocode}
-\def\addto@preamblecmds#1{%
-  \begingroup
-    \def\do{\noexpand\do\noexpand}%
-    \xdef\@preamblecmds{\@preamblecmds\do#1}%
-  \endgroup}
-\addto@preamblecmds{\addto@preamblecmds\do\@preamblecmds}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Auxilary files and style options}
-%
-% The formats and selections are specified using style options, but these do
-% not correspond to independent files.
-% It is possible to set the flags before inputting "seminar.sty".
-%    \begin{macrocode}
-\def\sem@temp#1{\@ifundefined{if#1}%
-  {\def\@tempa{\csname newif\endcsname}
-  \expandafter\@tempa\csname if#1\endcsname}{}}
-\sem@temp{article}{}
-\sem@temp{slidesonly}{}
-\sem@temp{notes}{}
-\sem@temp{notesonly}{}
-\sem@temp{notesonlystar}{}
-\sem@temp{portrait}{}
-\def\ds@article{\articletrue}
-\def\ds@slidesonly{\slidesonlytrue\notesfalse\notesonlyfalse}
-\def\ds@notes{\notestrue\slidesonlyfalse\notesonlyfalse}
-\def\ds@notesonly{\notesonlytrue\slidesonlyfalse\notesfalse}
-\@namedef{ds@notesonly*}{\ds@notesonly\notesonlystartrue}
-\def\ds@portrait{\portraittrue}
-\@namedef{ds@a4}{%
-  \def\paperwidth{210mm}
-  \def\paperheight{297mm}
-  \slidewidth 222mm
-  \slideheight 152mm\relax}
-%    \end{macrocode}
-% This style is based in part on the \LaTeX{} "article" style, which we now
-% input. "article.sty" takes care of executing the options.
-%    \begin{macrocode}
-\@@input article.sty
-\ifnotesonly\else\notesonlystarfalse\fi
-\@@input sem-page.sty
-%    \end{macrocode}
-%
-% \section{Document hooks}
-%
-% \begin{macro}{\document}
-% "\document" is redefined to incorporate hooks, in the following order:
-% \begin{LVerbatim}
-%   \endgroup
-%   \the\before@document
-%   \begingroup
-%   \document
-%   \the\after@document
-%   \xcomment@hook
-% \end{LVerbatim}
-% "\before@document" and "\after@document" are token registers that can be
-% added to using "\addto@hook". These will be used for things like invoking
-% "\landscape". "\xcomment@hook" is a command sequence that will be used to
-% invoke the "xcomment" macros for commenting out the notes in the
-% "slidesonly" selection.
-%
-% Messing with the definition of "\document" creates potential conflicts with
-% other optional style files that do the same. However, we add these commands
-% in a very friendly way: (i) it shouldn't cause problems even if "\document"
-% does not have its standard definition, and (ii) if some other macros
-% subsequently change the definition of "\document" in the same way,
-% "seminar.sty" should not break. Styles designed specifically for use with
-% "seminar.sty" should use "\before@document" and "\after@document" to add
-% their own modifications to the "\document" command. \codelabel{document}
-%
-% In the code below, "\before@document" and "\after@document" are used as
-% temporary token registers during the modification of "\document".
-%    \begin{macrocode}
-\newtoks\before@document
-\newtoks\after@document
-\let\xcomment@hook\relax
-\before@document{\endgroup\the\before@document\begingroup}
-\after@document{\the\after@document\xcomment@hook}
-\expandafter\@temptokena\expandafter{\document}
-\edef\document{\the\before@document\the\@temptokena\the\after@document}
-\before@document{}
-\after@document{}
-%    \end{macrocode}
-% \codelabel*{document*}
-% \end{macro}
-%
-% \begin{macro}{\enddocument}
-% Now we do something similar with "\end@document", adding the token register
-% "\before@enddocument" to the beginning of the definition of "\enddocument".
-% This might be used, for example, to warn the user to print in landscape
-% mode.
-%    \begin{macrocode}
-\newtoks\before@enddocument
-\before@enddocument{\the\before@enddocument}
-\expandafter\@temptokena\expandafter{\enddocument}
-\edef\enddocument{\the\before@enddocument\the\@temptokena}
-\before@enddocument{}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\landscape}
-% "\printlandscape" is invoked at the beginning of landscape documents. It is
-% defined here to warn the user to print in landscape mode.
-%    \begin{macrocode}
-\newif\ifprintlandscape
-\ifportrait
-  \ifarticle\printlandscapetrue\fi
-\else
-  \ifarticle\else\printlandscapetrue\fi
-\fi
-\addto@hook\before@document{\ifprintlandscape\printlandscape\fi}
-\addto@preamblecmds{\printlandscape}
-\def\printlandscape{\addto@hook\before@enddocument{%
-  \typeout{^^J%
-  *******************************************************^^J%
-  ***** !! PRINT THIS DOCUMENT IN LANDSCAPE MODE !! *****^^J%
-  *******************************************************}}}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Slide-making macros}
-%
-% \begin{macro}{\slide,\endslide,\slide*,\endslide*}
-% Let's start from the outside and move in.
-%    \begin{macrocode}
-\def\slide{%
-  \NestedSlide@Error{slide}%
-  \landscapetrue
-  \@ifnextchar[{\begin@slide}{\begin@slide[\slidewidth,\slideheight]}}
-\def\endslide{\end@slide}
-\@namedef{slide*}{%
-  \NestedSlide@Error{slide*}%
-  \landscapefalse
-  \@ifnextchar[{\begin@slide}{\begin@slide[\slidewidth,\slideheight]}}%
-\@namedef{endslide*}{\end@slide}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\theslide}
-% "slide" is the counter for slides. "slide@count" keeps track of the number
-% of slides in the current slide environment.
-%    \begin{macrocode}
-\newcounter{slide}
-\def\theslide{\arabic{slide}}
-\newcount\slide@count
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@slidebox}
-% Each slide is stored in the box "\@slidebox". The current page of notes
-% might be saved in "\not@slidebox".
-%    \begin{macrocode}
-\newbox\@slidebox
-\newbox\not@slidebox
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\ifslide,\iflandscape}
-% "\ifslide" is true in any slide environment. This allows commands to be
-% active only in slide environments (important for overlays, for example).
-% "\iflandscape" is true for landscape slides, and false for portrait slides.
-% This allows embellishments to customize their behavior, although it is not
-% actually used by any of the macros defined in "seminar.sty".
-%    \begin{macrocode}
-\newif\ifslide
-\newif\iflandscape
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@landscapeonly,\landscapeonly,\portraitonly}
-% "\@landscapeonly" is defined to be "1" if only landscape slides should be
-% printed, "-1" if only portrait slides should be printed, and "0" if both
-% orientations should be printed.
-%    \begin{macrocode}
-\def\@landscapeonly{0}
-\def\landscapeonly{\def\@landscapeonly{1}}
-\def\portraitonly{\def\@landscapeonly{-1}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\NestedSlide@Error}
-% We will check for nested slide environments, and attempt to recover the best
-% we can. Otherwise, forgetting the end of a slide environment could cause
-% \TeX{} to procede to the end of the document without generating any input,
-% and then give unlightening error messages.
-%    \begin{macrocode}
-\def\NestedSlide@Error#1{%
-  \ifslide
-    \endgroup
-    \@seminarerr{Nested slide environments. Perhaps missing
-      \string\end{\@currenvir}. May be fatal}\@ehd
-    \expandafter\end\expandafter{\@currenvir}%
-    \ifslide\expandafter\end\expandafter{\@currenvir}\fi
-    \begingroup
-    \def\@currenvir{#1}%
-  \fi}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\begin@slide}
-% This is the meat of "\slide" and "\slide*".
-%    \begin{macrocode}
-\def\begin@slide[#1,#2]{%
-  \slide@clearpage
-  \setlength\slidewidth{#1}%
-  \setlength\slideheight{#2}%
-%    \end{macrocode}
-% The current contents of the page is saved in "\not@slidebox", and then the
-% output routine is set to "\slide@output".
-%    \begin{macrocode}
-  \begingroup
-    \ifarticle
-      \output{%
-        \advance\count@ 1
-        \global\setbox\not@slidebox\box\@cclv}%
-      \par\@@par\penalty-\@M
-    \fi
-    \output{\slide@output}%
-%    \end{macrocode}
-% The flag "\ifslide" is set, and the counter "\slide@count", which keeps
-% track of the number of slides in the current slide environment, is
-% initialized.
-%    \begin{macrocode}
-    \slidetrue
-    \ifarticle\global\slide@count=\z@\fi
-    \refstepcounter{slide}%
-    \ifnotesonlystar\xdef\first@slidemarker{\the\c@slide}\fi
-    \def\do##1{\setcounter{##1}\z@}\slide@reset
-%    \end{macrocode}
-% Save current "\textheight" and "\textwidth", to be used later by the output
-% routine in the "slides" format.
-%    \begin{macrocode}
-    \ifarticle\else
-      \edef\page@textheight{\number\textheight sp}%
-      \edef\page@textwidth{\number\textwidth sp}%
-    \fi
-    \set@slidesize
-%    \end{macrocode}
-% Now we finish customizing the slide environment.
-%    \begin{macrocode}
-    \slidebox@restore
-    \the\slide@hook
-    \the\before@newslide
-    \everyslide}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\end@slide}
-% This is "\endslide" and "\endslide*". We first make sure that there are
-% balanced groups so that the normal output routine is restored.
-%    \begin{macrocode}
-\def\end@slide{%
-    \par\penalty-\@M
-    \xdef\@tempg{\@currenvir}%
-  \endgroup
-  \ifslide
-    \@seminarerr{Perhaps missing `\string\end{\@tempg}',
-      \iffalse{\fi`\string}' or `\string\endgroup'}\@ehd
-    \def\next{\endgroup\ifslide\expandafter\next\fi}%
-    \next
-  \fi
-%    \end{macrocode}
-% If there is anything on the page, it was inserted with "\aftergroup" and
-% should be discarded. (This can happen with color commands, for example.)
-%    \begin{macrocode}
-  \begingroup
-    \output{\setbox\@tempboxa\box\@cclv}%
-    \@@par\penalty-\@M
-  \endgroup
-%    \end{macrocode}
-% The slide counter was stepped when the last slide was output. Now we need to
-% set it back one. With the "article" format, we now have to output all the
-% acculumulated slides.
-%    \begin{macrocode}
-  \global\advance\c@slide-1
-  \def\do##1{\setcounter{##1}{\@nameuse{saved@c@##1}}}%
-  \slide@reset
-  \ifarticle\outputloop@savedslides\fi
-  \the\after@slide}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slideclearpagetrue,\slideclearpagefalse,\slide@clearpage}
-%    \begin{macrocode}
-\let\slideclearpagetrue\relax
-\let\slideclearpagefalse\relax
-\ifarticle
-  \def\slide@clearpage{\par\penalty\z@}
-  \ifnotes
-    \def\slideclearpagetrue{\def\slide@clearpage{\clearpage}}
-    \def\slideclearpagefalse{\def\slide@clearpage{\par\penalty\z@}}
-  \else
-    \ifnotesonly
-      \def\slideclearpagetrue{\def\slide@clearpage{\clearpage}}
-      \def\slideclearpagefalse{\def\slide@clearpage{\par\penalty\z@}}
-    \fi
-  \fi
-\else
-  \def\slide@clearpage{\clearpage}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slide@hook,\everyslide,\after@slide}
-% "\slide@hook" and "\everyslide" are hooks for modifying the slide
-% environments. "\slide@hook" is a token register. Commands can be added to it
-% without destroying previously added commands using the "\addto@hook"
-% command.
-% "\everyslide" is an ordinary command sequence to be used by users.
-% "\after@slide" can be used to initialize things for notes.
-%    \begin{macrocode}
-\newtoks\slide@hook
-\def\everyslide{}
-\newtoks\after@slide
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{$\setminus$slidebox@restore\label{everyslide}}
-%
-% \begin{macro}{\slidebox@restore}
-% "\slidebox@restore" sets up the spacing parameters at the beginning of every
-% slide. The component commands are defined following this macro.
-%    \begin{macrocode}
-\def\slidebox@restore{%
-  \def\thepage{\theslide}%
-  \def\newpage{\newslide}%
-  \def\clearpage{\newslide}%
-  \def\thispagestyle{\notslide@err{\thispagestyle}}%
-  \pagestyle{\slide@pagestyle}%
-  \@twocolumnfalse
-  \def\twocolumn{\notslide@err{\twocolumn}}%
-  \def\onecolumn{\notslide@err{\onecolumn}}%
-  \def\marginpar{\notslide@err{\marginpar}}%
-  \def\thanks{\slidethanks}%
-  \def\maketitle{\slidemaketitle}%
-  \fix@floats
-  \fix@whatsits
-  \slide@footnotes
-  \def\do##1{\expandafter\xdef\csname
-   saved@c@##1\endcsname{\the\@nameuse{c@##1}}}%
-  \slide@reset
-  \topskip\z@ \maxdepth\z@
-  \slide@listparameters
-  \slidefonts
-  \def\baselinestretch{\slidestretch}%
-  \def\arraystretch{\slidearraystretch}%
-  \sem@ptsize{\slide@ptsize}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\thedate,\theauthor,\thetitle,\thethanks}
-% The "\date", "\author" and "\title" commands are redefined so that they save
-% their information in accessible command sequences, "\thedate", "\theauthor"
-% and "\thetitle". "\thanks" is saved so that it can be restored during slide
-% environments. "\thethanks" is set to "\@thanks" so that it is easier to
-% redefine "\slidemaketitle" in the preamble.
-%    \begin{macrocode}
-\def\date#1{\gdef\@date{#1}\gdef\thedate{#1}}
-\def\author#1{\gdef\@author{#1}\gdef\theauthor{#1}}
-\def\title#1{\gdef\@title{#1}\gdef\thetitle{#1}}
-\date{\today}
-\let\slidethanks\thanks
-\def\thethanks{\@thanks}%
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidemaketitle}
-%    \begin{macrocode}
-\def\slidemaketitle{%
-  \par
-  \begin{center}\bf
-    {\large \thetitle}\par\vskip 1ex
-    \begin{tabular}[t]{c} \theauthor \end{tabular}\par\vskip 1ex
-    \thedate
-  \end{center}%
-  \thethanks\par}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\fix@floats}
-% Floats are neutralized, but the captions work as usual. This makes it easier
-% to just transfer a float from some other document to a slide. This only
-% works if end of floating environment is "\def"ined to be "\end@float",
-% rather than "\let" to be "\end@float", or if "\@float{foo}" is ended by
-% "\endfoo". This should get 99\% of the cases.
-%    \begin{macrocode}
-\def\fix@floats{%
-  \def\@xfloat##1[##2]{%
-    \expandafter\let\csname end##1\endcsname\end@float
-    \par\medskip\vbox\bgroup\def\@captype{##1}\parindent\z@
-    \ignorespaces}%
-  \def\end@float{\par\vskip\z@\egroup\medskip}%
-  \def\@dblfloat{\@float}\def\end@dblfloat{\end@float}%
-  \def\endfigure{\end@float}\def\endtable{\end@float}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\fix@whatsits}
-% The whatsits "\write", "\openout" and "\closeout" are problematic in slides
-% for two reasons:
-% \begin{enumerate}
-% \item First, an otherwise empty vertical list with a whatsit is not empty.
-% Thus, if a slide begins with a "\write" command, followed by a line a text,
-% "\parskip" is inserted before the text. This can be quite noticable in a
-% slide environment, since by default "\parskip" is about 2.5\% of the height
-% of a slide. This problem is likely to arise because it is convenient to put
-% a slide's "\label" command first.
-% \item Second, the slides are omitted in the "notesonly" selection, but we
-% want to preserve cross-referencing.
-% \end{enumerate}
-% We solve both problems by making the three whatsits mentioned above
-% "\immediate" within the slide environments. This might cause unforeseen
-% problems for some macros. It also introduces a known problem: slide
-% cross-references may not be accurate if \TeX\ is doing the page breaking
-% automatically.
-%    \begin{macrocode}
-\let\normal@write\write
-\let\normal@read\read
-\let\normal@openout\openout
-\let\normal@closeout\closeout
-\def\fix@whatsits{%
-  \def\write{\immediate\normal@write}%
-  \def\read{\immediate\normal@read}%
-  \def\openout{\immediate\normal@openout}%
-  \def\closeout{\immediate\normal@closeout}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slide@footins,\theslidefootnote,\slide@footnotes}
-% We want to set up a parallel footnote system for slides. It acts just like
-% regular footnotes, but
-% \begin{LVerbatim}
-%   \interfootnotelinepenalty\@M
-% \end{LVerbatim}
-% means that footnotes will not be split across pages.
-%    \begin{macrocode}
-\newinsert\slide@footins
-\skip\slide@footins=\bigskipamount
-\count\slide@footins=1000
-\dimen\slide@footins=4in
-\def\theslidefootnote{\alph{footnote}}
-\def\slide@footnotes{%
-  \def\thefootnote{\theslidefootnote}%
-  \let\footins\slide@footins
-  \interfootnotelinepenalty\@M}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidefonts,\ifslidefonts}
-% "\slidefonts" should set up any special fonts for the slides.
-%    \begin{macrocode}
-\def\slidefonts{}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidestretch,\slidearraystretch}
-%    \begin{macrocode}
-\def\slidestretch{1.18}
-\def\slidearraystretch{1.2}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\raggedslides}
-% "\ragggedslides[0pt]" means justified, "\raggedslides[1fil]" means
-% "\raggedright". Ideally, we would also like a version that breaks lines the
-% same way as with justified text, but then doesn't stretch any glue to
-% justify the margin. This is impossible, but "\raggedslides[1em]", e.g., is
-% meant to be an intermediate case.
-%    \begin{macrocode}
-\def\raggedslides{\@ifnextchar[{\@raggedslides}{\@raggedslides[1fil]}}
-\def\@raggedslides[#1]{%
-  \edef\slide@@rightskip{#1}%
-  \ifslide\slide@rightskip\fi}
-\def\slide@rightskip{%
-  \@rightskip\z@ plus \slide@@rightskip\relax \rightskip\@rightskip}
-\def\slide@@rightskip{1fil}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\slide@listparameters}
-% The list parameters are generally tightened up, compared to the usual
-% spacing in "article.sty", to compensate for the large "\parskip" and
-% "\baselinestretch".
-%    \begin{macrocode}
-\newcount\slide@listdepth
-\def\slide@listparameters{%
-  \let\@listdepth\slide@listdepth
-  \slide@listdepth\z@
-  \def\@listi{\slide@listi}%
-  \def\@listii{\slide@listii}%
-  \def\@listiii{\slide@listiii}%
-  \let\@listiv\relax\let\@listv\relax\let\@listvi\relax}
-\def\slide@listi{%
-  \leftmargin\leftmargini
-  \labelwidth\leftmargini \advance\labelwidth-\labelsep
-  \parsep\parskip \divide\parsep2
-  \partopsep\slidepartopsep\relax
-  \advance\partopsep-\parskip
-  \ifdim\partopsep<\z@\partopsep\z@\fi
-  \itemsep\slideitemsep\relax
-  \ifdim\parsep<\itemsep
-    \topsep\itemsep \advance\topsep-\parsep
-  \else
-    \itemsep\parsep \topsep\z@
-  \fi}
-\def\slide@listii{%
-  \leftmargin\leftmarginii
-  \labelwidth\leftmarginii \advance\labelwidth-\labelsep
-  \divide\itemsep2 \divide\parsep2
-  \divide\topsep2 \divide\partopsep2\relax}%
-\def\slide@listiii{%
-  \leftmargin\leftmarginiii
-  \labelwidth\leftmarginiii \advance\labelwidth-\labelsep
-  \itemsep \z@ \parsep\z@ \topsep\z@}%
-\def\slideleftmargini{1.8em}
-\def\slideleftmarginii{1.4em}
-\def\slideleftmarginiii{1em}
-\def\slidelabelsep{.5em}
-\def\slideitemsep{.8ex minus .2ex}
-\def\slidepartopsep{1ex minus .2ex}
-%    \end{macrocode}
-% \codelabel{defaultpar*}%
-% \end{macro}
-%
-% \section{Slide output routines: $\setminus$output}
-%
-% \begin{macro}{\save@slidespecials}
-% First, a trick to make sure that "\special"'s in the preamble end up on the
-% first page of the document, even if the first slide is omitted, or if the
-% first item in the document is a float (in which case \LaTeX\ discards
-% "\special"'s). "\@textop" is used to insert the specials if the first page
-% is processed by \LaTeX's usual output routines, and "\insert@specials" is
-% used to insert the specials if the first page is a slide in the "slides"
-% format (see the definition of "\output@slide" below).
-%    \begin{macrocode}
-\newbox\saved@specials
-\def\save@slidespecials{%
-  \begingroup
-    \output{%
-      \global\setbox\saved@specials=\box\@cclv
-      \global\wd\saved@specials=\z@
-      \global\dp\saved@specials=\z@
-      \global\ht\saved@specials=\z@}%
-    \hbox{}\penalty-\@M
-    \global\let\saved@texttop\@texttop
-    \gdef\@texttop{%
-      \ifvoid\saved@specials\else\box\saved@specials\nointerlineskip\fi
-      \saved@texttop
-      \global\let\@texttop\saved@texttop}%
-  \endgroup}
-\addto@hook\after@document{\save@slidespecials}
-\ifarticle\else
-  \def\insert@specials{%
-    \ifvoid\saved@specials\else
-      \setbox\@slidebox\hbox{\box\saved@specials\box\@slidebox}%
-    \fi
-    \global\let\insert@specials\relax}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\extraslideheight}
-% This increases the height of a slide for the purpose of page-breaking. We
-% use unscaled dimensions so that \TeX's warnings about overfull "\vbox"'s
-% will be comparable.
-%    \begin{macrocode}
-\def\extraslideheight#1{%
-  \@tempdima #1\relax
-  \edef\X@SlideHeight{\number\@tempdima sp}
-  \ifslide\set@slidesize\fi}
-\extraslideheight{6pt}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\set@slidesize}
-% In addition to setting "\hsize" and "\vsize", this sets the \LaTeX\
-% parameters such as "\textheight" and "\textwidth" so that slides seem like a
-% regular page, whatever format is being used.
-%    \begin{macrocode}
-\def\set@slidesize{%
-  \iflandscape
-    \hsize=\inverseslidesmag\slidewidth
-    \vsize=\inverseslidesmag\slideheight
-  \else
-    \hsize=\inverseslidesmag\slideheight
-    \vsize=\inverseslidesmag\slidewidth
-  \fi
-  \edef\slide@vsize{\number\vsize sp}%
-  \textheight\vsize
-  \advance\vsize\X@SlideHeight\relax
-  \textwidth\hsize\columnwidth\hsize\linewidth\hsize}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\newslide}
-% This includes things you want to initialize whenever a new page is started
-%    \begin{macrocode}
-\def\newslide{%
-  \par\penalty-\@M
-  \def\do##1{\setcounter{##1}\z@}\slide@reset
-  \the\before@newslide
-  \set@slidesize}
-\newtoks\before@newslide
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidereset,\addtoslidereset}
-% "\addto@slidereset{foo,bar}" sets "\slide@reset" to
-% \begin{quote}
-%    "\slide@reset\do{foo}\do{bar}"
-% \end{quote}
-%    \begin{macrocode}
-\def\slide@reset{\do{footnote}}
-\def\slidereset#1{\def\slide@reset{}\addtoslidereset{#1}}
-\def\addtoslidereset#1{%
-  \edef\@tempa{#1}\expandafter\addto@slidereset\@tempa,\@nil,}
-\def\addto@slidereset#1,{%
-  \ifx\@nil#1\else
-    \@ifundefined{c@#1}%
-      {\@seminarerr{Counter `#1' not defined}\@ehd}%
-      {\expandafter\def\expandafter\slide@reset\expandafter{%
-        \slide@reset\do{#1}}}%
-    \expandafter\addto@slidereset
-  \fi}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slide@output}
-% "\os@test" checks whether according to some "\onlyslides" or "\notslides"
-% command, this slide should not be output; "\os@test" is defined in Section
-% \ref{os}.
-%    \begin{macrocode}
-\def\slide@output{%
-  \@makeslide
-  \@testfalse
-  \ifnotesonly\else
-    \iflandscape
-      \ifnum\@landscapeonly>-1 \os@test\fi
-    \else
-      \ifnum\@landscapeonly<1 \os@test\fi
-    \fi
-  \fi
-  \if@test
-    \reset@slideoutput
-    \@@makeslide
-    \process@slide
-  \fi
-  \refstepcounter{slide}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\reset@slideoutput}
-% Some things should be reset for the slide embellishments. E.g., you don't
-% want slide labels or headers and footers to be affected by the current font.
-%    \begin{macrocode}
-\def\reset@slideoutput{%
-  \let\par\@@par
-  \reset@font
-  \def\baselinestretch{1}%
-  \@nameuse{1\@ptsize @semptsize}%
-  \catcode`\ =10
-  \let\-\@dischyph \let\'\@acci \let\`\@accii \let\=\@acciii}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\ifcenterslides}
-% This is the flag for vertically centering slides.
-%    \begin{macrocode}
-\newif\ifcenterslides
-\centerslidestrue
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@makeslide,\@@makeslide}
-% Take care of footnotes and verticle positioning.
-%    \begin{macrocode}
-\def\@makeslide{%
-  \setbox\@slidebox\vbox{%
-    \unvbox\@cclv
-    \ifvoid\slide@footins\else
-      \vskip\skip\slide@footins
-      \footnoterule
-      \unvbox\slide@footins
-    \fi
-    \vskip\z@}}
-\def\@@makeslide{%
-  \overfullslide@warning
-  \setbox\@slidebox\hbox{%
-    \vfuzz=\slidefuzz\relax
-    \vbox to\slide@vsize{%
-    \ifcenterslides\vskip\z@ plus .0001fil \fi
-    \unvbox\@slidebox
-    \vskip\z@ plus .0001fil}%
-    \the\after@slidepage}%
-  \wd\@slidebox\textwidth}
-\def\overfullslide@warning{%
-  \dimen@\ht\@slidebox
-  \advance\dimen@-\slide@vsize\relax
-  \ifdim\dimen@>\slidefuzz\relax
-    \@warning{Slide \theslide\space overfull by \the\dimen@}%
-  \fi}
-\def\slidefuzz{2pt}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\after@slidepage}
-% "\after@slidepage" is executed at the end of each page of a slide
-% environment during the slide output routine. It is meant to reset things
-% that might have been set by "\special"'s within the slide.
-%    \begin{macrocode}
-\newtoks\after@slidepage
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Rotation}
-%
-% Rotation macros must be implemented by "\special"'s, such as in
-% "semcolor.sty". The interface for rotation is built into "seminar.sty",
-% however.
-%
-% \begin{macro}{\ifrotateheaders}
-% In the "slides" format, the slides can either be rotated before being placed
-% on the page, or the whole page can be rotated, including headers.
-% "\ifrotateheaders" controls which procedure is used.
-%    \begin{macrocode}
-\newif\ifrotateheaders
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\sliderotation}
-%    \begin{macrocode}
-\def\sliderotation#1{\@ifundefined{semsr@#1}%
-  {\@latexerr{Slide rotation `#1' not defined.}\@eha}%
-  {\@nameuse{semsr@#1}}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\semsr@none,\semsr@left,\semsr@right}
-% A slide rotation should define "\rotate@slide" to rotate "\@slidebox"..
-%    \begin{macrocode}
-\def\semsr@left{%
-  \def\rotate@slide{%
-    \setbox\@slidebox\hbox{\leftsliderotation{\box\@slidebox}}}}
-\def\semsr@right{%
-  \def\rotate@slide{%
-    \setbox\@slidebox\hbox{\rightsliderotation{\box\@slidebox}}}}
-\def\semsr@none{\let\rotate@slide\relax}
-\sliderotation{none}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\leftsliderotation,\rightsliderotation}
-%    \begin{macrocode}
-\def\leftsliderotation#1{%
-  \@seminarerr{\string\leftsliderotation\space has not been defined}%
-  \@ehd}
-\let\rightsliderotation\leftsliderotation
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\@ifrotateslide}
-%    \begin{macrocode}
-\def\@ifrotateslide#1{%
-  \ifx\rotate@slide\relax\else
-    \iflandscape\ifportrait#1\fi\else\ifportrait\else#1\fi\fi
-  \fi}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Slide output routines: $\setminus$process@slide\label{slideoutput}}
-%
-% This is the version-dependent stuff, where we decide what to do with the
-% slide.
-%
-% \begin{macro}{\process@slide}
-% "\process@@slide" is kept separate because it can be redefined for doing
-% overlays.
-%    \begin{macrocode}
-\def\process@slide{%
-  \slideframewidth=\inverseslidesmag\slideframewidth
-  \slideframesep=\inverseslidesmag\slideframesep
-  \fboxrule\slideframewidth
-  \fboxsep\slideframesep
-  \ifarticle
-    \@ifrotateslide\rotate@slide
-  \else
-    \ifrotateheaders\else\@ifrotateslide\rotate@slide\fi
-  \fi
-  \process@@slide}
-\def\process@@slide{\finish@slide\output@slide}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\finish@slide}
-%    \begin{macrocode}
-\def\finish@slide{%
-  \theslideframe
-  \add@slidelabel\slidelabel}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\output@slide}
-% In the "article" format, the slides are saved until the end of the slide
-% environment.
-%     \begin{macrocode}
-\ifarticle
-  \def\output@slide{%
-    \global\advance\slide@count1
-    \@ifundefined{slidebox@\the\slide@count}%
-      {{\globaldefs=1\expandafter
-        \new@slidebox\csname slidebox@\the\slide@count\endcsname}}{}%
-    \expandafter\global\expandafter\setbox\csname
-      slidebox@\the\slide@count\endcsname\box\@slidebox}
-%    \end{macrocode}
-% In the "slides" format, we use a modification of \LaTeX's "\@outputpage".
-% "\do@fancyput" is stuck in here in case "fancybox.sty" is being used.
-% "\fancyput@flag" is initialized in case it is not
-%    \begin{macrocode}
-\else
-  \def\output@slide{%
-    \begingroup
-      \hoffset=-\inverseslidesmag in
-      \voffset=-\inverseslidesmag in
-      \setslidelength\@tempdima{%
-        \ifportrait\paperwidth\else\paperheight\fi}
-      \setslidelength\@tempdimb{%
-        \ifportrait\paperheight\else\paperwidth\fi}
-      \ifrotateheaders
-        \@ifrotateslide{%
-          \dimen@=\@tempdima
-          \@tempdima=\@tempdimb
-          \@tempdimb=\dimen@}
-      \fi
-      % \oddsidemargin, \evensidemargin, \headheight, \footheight
-      % used for scratch:
-      \setslidelength\oddsidemargin\slideleftmargin
-      \setslidelength\evensidemargin\sliderightmargin
-      \setslidelength\headheight\slidetopmargin
-      \setslidelength\footheight\slidebottommargin
-      % Some page styles like to know \textwidth:
-      \textwidth=\@tempdima
-      \advance\textwidth-\oddsidemargin
-      \advance\textwidth-\evensidemargin
-      \setbox\@slidebox=\hbox to \@tempdima{%
-        \kern\oddsidemargin
-        \vbox to\@tempdimb{%
-          \ifnum\fancyput@flag>-1
-            \hbox{\kern-\oddsidemargin\do@fancyput}%
-          \fi
-          \let\label\@gobble
-          \let\index\@gobble
-          \let\glossary\@gobble
-          \vbox to\headheight{%
-            \vfill
-            \hbox{%
-              \slideheadfont\relax\strut
-              \hbox to\textwidth{\@oddhead}}%
-            \kern\z@}%
-          \vfill
-          \hbox to\textwidth{\hss\box\@slidebox\hss}%
-          \vfill
-          \vbox to\footheight{%
-            \hbox{%
-              \slidefootfont\relax\strut
-              \hbox to\textwidth{\@oddfoot}}%
-            \vfill}}%
-        \hss}%
-      \ifrotateheaders\@ifrotateslide\rotate@slide\fi
-      \insert@specials
-      \shipout\box\@slidebox
-    \endgroup
-    \let\firstmark\botmark}
-  \@ifundefined{fancyput@flag}{\def\fancyput@flag{-1}}{}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\output@savedslide}
-% Now we take care of the saved slides in the "article" format. Lots of things
-% can happen.
-%    \begin{macrocode}
-\newskip\slidesep
-\slidesep\intextsep
-\ifarticle
-  \def\fps@fslide{htbp}
-  \def\ftype@fslide{32}
-  \def\float@savedslide{%
-    \begingroup\@float{fslide}%
-      \centerline{\box\@slidebox}%
-    \end@float\endgroup}%
-  \@namedef{float*@savedslide}{%
-    \begingroup\@dblfloat{fslide}%
-      \centerline{\box\@slidebox}%
-    \end@dblfloat\endgroup}%
-  \def\center@slide{\hbox{%
-    \kern-\@totalleftmargin
-    \hbox to \columnwidth{\hss\box\@slidebox\hss}}}%
-  \def\onepercol@savedslide{%
-    \vbox to .996\textheight{\vss\center@slide\vss}\goodbreak}%
-  \def\twopercol@savedslide{%
-    \dimen@.5\textheight
-    \advance\dimen@-\slidesep
-    \ifdim\ht\@slidebox>\dimen@
-      \onepercol@savedslide
-    \else
-      \vbox to .498\textheight{\vss\center@slide\vss}\goodbreak
-    \fi}
-  \def\here@savedslide{%
-    \addvspace\slidesep\center@slide\addvspace\slidesep}
-  \@namedef{here*@savedslide}{%
-    \goodbreak \hrule \@height\z@ \nobreak \vskip\slidesep \nobreak
-    \center@slide
-    \nobreak \vskip\slidesep \nobreak \hrule\@height\z@ \goodbreak}
-\fi
-\ifarticle
-  \def\slideplacement#1{\@ifundefined{#1@savedslide}%
-    {\@seminarerr{Slide placement `#1' undefined}\@ehd}%
-    {\expandafter\let\expandafter\output@savedslide
-      \csname #1@savedslide\endcsname}}
-\else
-  \def\slideplacement#1{}
-\fi
-\ifarticle
-  \ifnotes
-    \ifportrait
-      \slideplacement{float}
-    \else
-      \slideplacement{float*}
-    \fi
-  \else
-    \ifportrait
-      \slideplacement{onepercol}
-    \else
-      \slideplacement{twopercol}
-    \fi
-  \fi
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\outputloop@savedslides}
-% This is the loop that spits out each of the saved slides. We start by
-% reinserting whatever was on the current page when the slide environment
-% started.
-%    \begin{macrocode}
-\ifarticle
-  \def\outputloop@savedslides{%
-    \global\maxdepth\@maxdepth
-    \ifvoid\not@slidebox\else
-      \dimen@=\dp\not@slidebox
-      \unvbox\not@slidebox
-      \hrule height\z@
-      \prevdepth\dimen@
-      \penalty\z@
-    \fi
-    \edef\slide@@count{\the\slide@count\relax}%
-    \slide@count\z@
-    \loop
-    \ifnum\slide@count<\slide@@count
-      \advance\slide@count1
-      \expandafter\setbox\expandafter\@slidebox\expandafter\box
-        \csname slidebox@\the\slide@count\endcsname
-      \output@savedslide
-    \repeat
-    \ifnotesonlystar\make@slidemarker\fi}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\make@slidemarker}
-%    \begin{macrocode}
-\def\make@slidemarker{%
-  \addvspace\slidesep
-  \moveleft\@totalleftmargin
-  \vbox{%
-    \hsize\columnwidth
-    \hrule height 1pt
-    \kern 8pt
-    \hbox to \columnwidth{%
-      \hss
-      \LARGE\bf\the@slidemarker
-      \hss}%
-    \kern 8pt
-    \hrule height 1pt}%
-  \addvspace\slidesep}
-\def\the@slidemarker{%
-  Slide%
-  \ifnum\c@slide=\first@slidemarker\else
-    s {\c@slide\first@slidemarker\relax\theslide} --\fi
-  { }\theslide}%
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Page numbering in the {\tt slides} format}
-%
-% In the "slides" format, we let the "page" counter be stepped as usual by the
-% output routine, but we don't use it for anything except perhaps to keep
-% track of the absolute page number. Instead, we have a counter "note" to keep
-% track of the pages of notes, and "\thepage" is set to "\thenote" for notes
-% and "\theslide" for slides (and "\theoverlay" for overlays and "\thelayer"
-% for layers).
-%
-% \begin{macro}{\c@note}
-% The "note" counter has to be stepped by the output routine, and reset by the
-% slide environments. In the "article" format, we just make the "note" counter
-% the same as the "page" counter.
-%    \begin{macrocode}
-\ifarticle
-  \let\c@note\c@page
-  \def\p@note{\p@page}
-  \def\thenote{\thepage}
-\else
-  \newcounter{note}
-  \def\thenote{\theslide-\arabic{note}}
-  \def\thepage{\thenote}
-  \addto@hook\after@slide{\setcounter{note}{1}}
-  \expandafter\def\expandafter\@outputpage\expandafter{%
-    \@outputpage\stepcounter{note}}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% Which counter should the dvi driver pay attention to when numbering the
-% pages in the "slides" format? This makes a difference when using the dvi
-% driver to select pages. If the driver numbers pages by the slide number,
-% then it is easier to use the driver to print selected slides.
-% However, this can be cumbersome when there are many pages of notes or
-% overlays, especially if the driver cannot pick out the $n^{th}$ occurence of
-% a page, because many pages will have the same page number. In this case,
-% keeping track of physical page numbers may be preferred. We allow both
-% options.
-%
-% By default, the dvi driver pays attention to the slide counter; i.e., this
-% counter is assigned register 0
-%    \begin{macrocode}
-\ifarticle\else
-  \let\c@page\c@slide
-  \countdef\c@slide=0
-  \c@slide=0
-  \c@page=1
-\fi
-%    \end{macrocode}
-%
-% \begin{macro}{\truepagenumbers}
-% This switches back to having the driver recognize physical page numbers.
-%    \begin{macrocode}
-\ifarticle
-  \let\truepagenumbers\relax
-\else
-  \def\truepagenumbers{%
-    \let\c@slide\c@page
-    \countdef\c@page=0
-    \c@page=1
-    \c@slide=0
-    \let\truepagenumbers\relax}
-\fi
-\addto@preamblecmds{\truepagenumbers}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Slide frames}
-%
-% \begin{macro}{\slideframewidth,\slideframesep}
-%    \begin{macrocode}
-\newdimen\slideframewidth \slideframewidth 4pt
-\newdimen\slideframesep \slideframesep .3in
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\newslideframe,\slideframe}
-%    \begin{macrocode}
-\def\newslideframe#1{%
-  \@ifnextchar[{\@newslideframe{#1}}{\@newslideframe{#1}[]}}
-\def\@newslideframe#1[#2]{%
-  \@namedef{semsfops@#1}{#2}%
-  \@namedef{semsf@#1}##1}
-\newslideframe{plain}{\fbox{#1}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slideframe,\@slideframe}
-%    \begin{macrocode}
-\def\slideframe{\@slideframe{slide}}
-\def\@slideframe#1{%
-  \@ifstar{\@testtrue\@@slideframe{#1}}{\@testfalse\@@slideframe{#1}}}
-\def\@@slideframe#1{%
-  \@ifnextchar[{\@@@slideframe{#1}}{\@@@slideframe{#1}[]}}
-\def\@@@slideframe#1[#2]#3{%
-  \def\@tempa{none}%
-  \def\@tempb{#3}%
-  \ifx\@tempa\@tempb
-    \@namedef{the#1frame}{\relax}%
-  \else
-    \ifx\@tempb\@empty
-      \@namedef{the#1frame}{}%
-    \else
-      \@ifundefined{semsf@#3}%
-        {\@seminarerr{Slide frame `#3' undefined}\@eha}%
-        {\if@test
-          \@@@@slideframe{#1}[#2]{#3}%
-        \else
-          \@namedef{the#1frame}{\setbox\@slidebox=\hbox{{%
-            \@nameuse{semsfops@#3}#2\@nameuse{semsf@#3}{\box\@slidebox}}}}%
-        \fi}%
-     \fi
-   \fi}
-\def\@@@@slideframe#1[#2]#3{%
-  \expandafter\let\expandafter\@tempa\csname the#1frame\endcsname
-  \edef\next{%
-    \noexpand\def\expandafter\noexpand\csname the#1frame\endcsname}%
-  \expandafter\next\expandafter{\@tempa
-    \setbox\@slidebox=\hbox{{%
-      \@nameuse{semsfops@#3}%
-      #2%
-      \@nameuse{semsf@#3}{\box\@slidebox}}}}}%
-\slideframe{plain}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Slide styles\label{slidestyles}}
-%
-% \begin{macro}{\slidestyle}
-%    \begin{macrocode}
-\def\slidestyle#1{\@ifundefined{ss@#1}%
-  {\@seminarerr{Slide style `#1' undefined}\@eha}%
-  {\@nameuse{ss@#1}}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\ss@empty,\ss@plain,\ss@plainbottom}
-% The "plain" slide style places the slide label on the left side of the
-% framed slide, centered vertically. The caption is set in a box with zero
-% width so that it does not affect the centering of the slide on the page. In
-% the "plainbottom" style, the label is centered at the bottom of the slide.
-%    \begin{macrocode}
-\def\ss@empty{\let\add@slidelabel\@gobble}
-\def\ss@left{\def\add@slidelabel##1{%
-  \setbox\@slidebox=\hbox{%
-    \vbox to \ht\@slidebox{\vss
-    \hbox to 0pt{\hss##1\hskip 15pt}%
-    \vss}\box\@slidebox}}}
-\def\ss@bottom{\def\add@slidelabel##1{%
-  \setbox\@slidebox=\vbox{\copy\@slidebox\vskip 9pt
-    \hbox to\wd\@slidebox{\hss##1\hss}}}}%
-\ifarticle
-  \ifportrait\slidestyle{bottom}\else\slidestyle{left}\fi
-\else
-  \slidestyle{empty}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidelabel}
-%    \begin{macrocode}
-\def\slidelabel{\bf Slide \theslide}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Page styles}
-%
-% \begin{macro}{\newpagestyle,\renewpagestyle}
-% The next two commands allow one to define new pages styles in the preamble
-% of a document without playing around with the catcode of "@".
-%    \begin{macrocode}
-\def\newpagestyle#1#2#3{%
-  \expandafter\newcommand\csname ps@#1\endcsname{%
-    \def\@oddhead{#2}\let\@evenhead\@oddhead
-    \def\@oddfoot{#3}\let\@evenfoot\@oddfoot}}
-\def\renewpagestyle#1#2#3{%
-  \expandafter\renewcommand\csname ps@#1\endcsname{%
-    \def\@oddhead{#2}\let\@evenhead\@oddhead
-    \def\@oddfoot{#3}\let\@evenfoot\@oddfoot}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidepagestyle}
-%    \begin{macrocode}
-\def\@ifgoodps#1{%
-  \@ifundefined{ps@#1}{\@seminarerr{Page style `#1' undefined}\@eha}}
-\def\slidepagestyle#1{%
-  \@ifgoodps{#1}%
-    {\ifslide\pagestyle{#1}\else\edef\slide@pagestyle{#1}\fi}}
-\def\ps@{}
-\slidepagestyle{}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\ps@align}
-%    \begin{macrocode}
-\ifarticle
-  \def\ps@align{}
-\else
-  \def\ps@align{%
-    \def\@oddhead{\thepage\hfil+}\let\@evenhead\@oddhead
-    \def\@oddfoot{+\hfil+}\let\@evenfoot\@oddfoot}
-\fi
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slideheadfont,\slidefootfont}
-%    \begin{macrocode}
-\def\slideheadfont{\scriptsize}
-\def\slidefootfont{\scriptsize}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Magnification}
-%
-% \begin{macro}{\magstep,\magstepminus}
-% We extend the definition of "\magstep"$n$ to $n=0,\ldots,9$, and define an
-% analogous macro for reduction. The argument of "\@magstep" {\em must be a
-% count register}.
-%    \begin{macrocode}
-\def\magstep#1{\ifcase#1 \@m\or 1200\or 1440\or 1728\or
-  2074\or 2488\or 2986\or 3583\or 4300\or 5160\fi\relax}
-\def\magstepminus#1{%
-  \ifcase#1 \@m\or 833\or 694\or 579\or 482\or 401\fi\relax}
-\def\@magstep#1{%
-  \ifnum#1<\z@\magstepminus{-#1}\else\magstep#1\fi}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\invert@mag}
-% If "\cs" is a command sequence (not a count register) that expands to an
-% integer $n>0$, then "\invert@mag\cs" sets "\cs" to $1000 n^{-1}$. E.g.,
-% after the commands
-% \begin{Ex}
-% "\def\mymag{\magstep2}"
-% "\invert@mag\mymag"
-% \end{Ex}
-% the meaning of "\mymag" is ".694444". We use dimension registers to access
-% \TeX's internal arithmetic routines.
-%    \begin{macrocode}
-{\catcode`\p=12\catcode`\t=12
-  \gdef\@@inv@@mag#1pt#2{\def#2{#1}}}
-\def\invert@mag#1{\@tempdima=1000pt
-  \divide\@tempdima by #1\relax
-  \expandafter\@@inv@@mag\the\@tempdima#1}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@slidesmag,\@articlemag}
-% "\@slidesmag" and "\@articlemag" define "\inverseslidesmag" and
-% "\inverseartmag" for use by "\setslidelength", etc., using the "\invert@mag"
-% routine defined above. They also set the magnification of the document in
-% the "slides" or "article" format. Their arguments can be any magnification.
-%    \begin{macrocode}
-\def\@slidesmag#1{%
-  \@tempcnta=#1\relax%
-  \ifnum\@tempcnta>0
-    \edef\inverseslidesmag{\the\@tempcnta}%
-    \invert@mag\inverseslidesmag
-    \ifarticle\else\mag\@tempcnta\fi
-  \else
-    \@seminarerr{\string\@slidesmag\space argument must be an
-      integer equal to 1000 times the magnification}\@eha
-  \fi}
-\def\@articlemag#1{%
-  \@tempcnta=#1\relax%
-  \ifnum\@tempcnta>0
-    \edef\inverseartmag{\the\@tempcnta}%
-    \invert@mag\inverseartmag
-    \ifarticle\mag\@tempcnta\fi
-  \else
-    \@seminarerr{\string\articlemag\space argument must be an
-      integer equal to 1000 times the magnification}\@eha
-  \fi}
-\addto@preamblecmds{\@slidesmag\do\@articlemag}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidesmag,\articlemag}
-% "\slidesmag" and "\articlemag" are an interface to "\@slidesmag" and
-% "\@articlemag", and allow only "\magstep" type magnifications.
-%    \begin{macrocode}
-\newdimen\semin
-\newdimen\semcm
-\def\@semmagerr#1{%
-  \@seminarerr{\string#1 argument must be an integer
-    between -5 and 9}\@eha}
-\def\slidesmag#1{%
-  \@tempcnta=#1\relax
-  \ifnum\@tempcnta>-6
-    \ifnum\@tempcnta<10
-      \edef\the@slidesmag{\the\@tempcnta}%
-      \@slidesmag{\@magstep\@tempcnta}%
-    \else
-      \@semmagerr\slidesmag
-    \fi
-  \else
-    \@semmagerr\slidesmag
-  \fi
-  \setslidelength\semin\seminlength
-  \setslidelength\semcm\semcmlength}
-\def\seminlength{1in}
-\def\semcmlength{1cm}
-\def\articlemag#1{%
-  \@tempcnta=#1\relax
-  \ifnum\@tempcnta>-6
-    \ifnum\@tempcnta<10
-      \edef\the@articlemag{\the\@tempcnta}%
-      \@articlemag{\@magstep\@tempcnta}%
-    \else
-      \@semmagerr\articlemag
-    \fi
-  \else
-    \@semmagerr\articlemag
-  \fi}
-\addto@preamblecmds{\slidesmag\do\articlemag}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\setslidelength,\addtoslidelength}
-%    \begin{macrocode}
-\def\setslidelength#1#2{%
-  #1=#2\relax
-  #1=\inverseslidesmag#1}%
-\def\addtoslidelength#1#2{%
-  \dimen@=#2\relax
-  \advance#1 by \inverseslidesmag\dimen@}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\setartlength,\addtoartlength}
-%    \begin{macrocode}
-\def\setartlength#1#2{%
-  #1=#2\relax
-  #1=\inverseartmag#1}
-\def\addtoartlength#1#2{%
-  \dimen@=#2\relax
-  \advance#1 by \inverseartmag\dimen@}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slide@epsfsize,\epsfslidesize}
-%    \begin{macrocode}
-\def\slide@epsfsize#1#2{%
-  \ifdim\epsfxsize=0pt
-    \ifdim\epsfysize=0pt
-      \inverseslidesmag#1%
-    \else
-      0pt
-    \fi
-  \else
-    \inverseslidesmag\epsfxsize
-  \fi
-  \epsfysize
-  \ifdim\epsfysize=0pt
-    \ifdim\epsfxsize=0pt
-      \inverseslidesmag#2%
-    \else
-      0pt
-    \fi
-  \else
-    \inverseslidesmag\epsfysize
-  \fi}
-\def\epsfslidesize{\let\epsfsize\slide@epsfsize}
-%    \end{macrocode}
-% \end{macro}
-%
-% Now the default magnifications are set:
-%    \begin{macrocode}
-\slidesmag{4}
-\articlemag{0}
-%    \end{macrocode}
-%
-%
-% \section{Page parameters\label{pageparameters}}
-%
-% When the the document begins, the page parameters are scaled depending on
-% the format and the magnification for that format, so that it is as if the
-% parameters were set with "true" dimensions. This allows a user to change the
-% magnification in the preamble without having to go back and rescale the page
-% parameters.
-%
-%  \begin{macro}{\do@pageparameters}
-% First, we define "\do@pageparameters" like "\do@specials", but with all the
-% page parameters listed on page 163 of Lamport's \LaTeX{} User's Guide and
-% Reference Manual. Parameters can be added the same way commands are added to
-% "\@preamblecmds".
-%    \begin{macrocode}
-\def\do@pageparameters{%
-  \do\oddsidemargin
-  \do\evensidemargin
-  \do\marginparwidth
-  \do\marginparsep
-  \do\topmargin
-  \do\headheight
-  \do\headsep
-  \do\textheight
-  \do\textwidth
-  \do\topskip
-  \do\footskip
-  \do\footheight}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\scale@pageparameters}
-% Now we define "\scale@pageparameters", which is invoked at the beginning of
-% the document, to scale the page parameters.
-%    \begin{macrocode}
-\ifarticle
-  \def\scale@pageparameters{%
-    \begingroup
-      \def\do##1{\global##1=\inverseartmag##1\relax}%
-      \do@pageparameters
-    \endgroup}
-\else
-  \def\scale@pageparameters{%
-    \begingroup
-      \def\do##1{\global##1=\inverseslidesmag##1\relax}%
-      \do@pageparameters
-    \endgroup}
-\fi
-\addto@hook\before@document{\scale@pageparameters}
-\addto@preamblecmds{\scale@pageparameters\do\do@pageparameters}
-%    \end{macrocode}
-% \end{macro}
-%
-% \section{Omitting and including notes}
-%
-% \begin{macro}{\allversions,\endallversions,\allversions*,\endallversions*}
-% The "allversions" environments are processed in any version.
-%    \begin{macrocode}
-\def\allversions{}
-\let\endallversions\relax
-\@namedef{allversions*}{\@bsphack\globaldefs=1}
-\@namedef{endallversions*}{\@esphack}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slide@list,\addtoslidelist}
-% "\slide@list" stores the list of environments that are to be included with
-% the "slidesonly" selection. Environments are added to it using the
-% "\addtoslidelist" command.
-%    \begin{macrocode}
-\def\slide@list{slide,slide*,allversions,allversions*}
-\def\addtoslidelist#1{\xdef\slide@list{\slide@list,#1}}
-\addto@preamblecmds{\addtoslidelist}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\xcomment@hook}
-% The macro "\@xcomment", defined in "xcomment.sty", does the actual omitting
-% of notes in the "slidesonly" format. Only environments in "\slide@list" are
-% processed.
-%    \begin{macrocode}
-\ifslidesonly
-  \@ifundefined{xcomment@@@}{\@@input xcomment.sty }{}
-  \def\xcomment@hook{\@xcomment{@@@}{\slide@list}}
-  \newxcomment[]{note}
-\else
-  \def\note{\@bsphack}%
-  \def\endnote{\@esphack}%
-\fi
-\def\noxcomment{\def\xcomment@hook{}}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Omitting and including slides\label{os}}
-%
-% This is pretty bad code, but it works.
-%
-% \begin{macro}{\onlyslides,\notslides}
-% "\onlyslides" and "\notslides" store their arguments, which should expand to
-% a comma separated list of numbers and ranges, in the command sequence
-% "\os@list". It is not immediately expanded, because the argument may contain
-% references that are not yet defined; recall that the ".aux" file is
-% processed at the beginning of the document.
-%    \begin{macrocode}
-\def\os@list{}
-\newif\if@os
-\def\onlyslides#1{\def\os@list{#1}\@ostrue
-  \def\os@warning{\@warning{\string\onlyslides\space argument
-    contains undefined references}}}
-\def\notslides#1{\def\os@list{#1}\@osfalse
-  \def\os@warning{\@warning{\string\notslides\space argument
-    contains undefined references}}}
-\addto@preamblecmds{\onlyslides\do\notslides}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\os@expandlist}
-% "\os@expandlist" is invoked at the beginning of the document, after the
-% ".aux" files has been processed.
-%    \begin{macrocode}
-\addto@hook\after@document{%
-  \ifx\os@list\@empty\else\os@expandlist\fi}
-%    \end{macrocode}
-% "\os@expandlist" first expands the list, and then processes each
-% comma-separated entry with "\os@expandrange".
-%    \begin{macrocode}
-\def\os@expandlist{%
-  \let\os@@warning\relax
-  \begingroup
-    \def\ref##1{\@ifundefined{r@##1}{?}%
-      {\noexpand\@car\@nameuse{r@##1}\noexpand\@nil}}%
-    \edef\@tempd{\os@list}%
-    \xdef\os@list{}%
-    \@for\@tempc:=\@tempd
-      \do{\expandafter\os@expandrange\@tempc-:-:\@nil}%
-    \os@@warning
-  \endgroup
-  \let\os@expandrange\relax
-  \let\os@checknum\relax
-  \let\os@expandlist\relax}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\os@expandrange}
-% "\os@expandrange" expands entries of the form $m$-$n$ to $(m-1)$+$(n+1)$,
-% which will simplify checking slide numbers against the list ("+" is used as
-% a separator instead of "-" to allow for negative numbers). Entries that
-% consist of a single number $n$ are treated like a range $n$-$n$.
-%    \begin{macrocode}
-\def\os@expandrange#1-#2-#3\@nil{%
-  \def\@tempa{?}\def\@tempb{#1}%
-  \ifx\@tempa\@tempb
-    \let\os@@warning\os@warning
-  \else
-    \@tempcnta=#1\relax
-    \def\@tempb{#2}%
-    \ifx\@tempa\@tempb
-      \let\os@@warning\os@warning
-    \else
-      \def\@tempa{:}%
-      \ifx\@tempa\@tempb
-        \@tempcntb=\@tempcnta
-      \else
-        \@tempcntb=#2\relax
-      \fi
-      \advance\@tempcnta by -1
-      \advance\@tempcntb by 1
-      \ifx\os@list\@empty
-        \xdef\os@list{\the\@tempcnta+\the\@tempcntb}%
-      \else
-        \xdef\os@list{\os@list,\the\@tempcnta+\the\@tempcntb}%
-      \fi
-    \fi
-  \fi}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\os@test}
-% "\os@test" checks whether a slide should be processed. For each entry
-% $m$-$n$ in the list "\os@list", if the slide number is greater than $m$ and
-% less than $n$, "\if@test" is set to "\if@os". Recall that "\if@os" is
-% "\iftrue" is "\os@list" is a list of slides to be included, and is
-% "\iffalse" if "\os@list" is a list of slides to be excluded.
-%    \begin{macrocode}
-\def\os@test{%
-  \@testtrue
-  \iflandscape
-    \ifnum\@landscapeonly=-1 \@testfalse\fi
-  \else
-    \ifnum\@landscapeonly=1 \@testfalse\fi
-  \fi
-  \if@test
-    \ifx\os@list\@empty\else
-      \if@os\@testfalse\fi
-      \@for\@tempa:=\os@list\do{\expandafter\os@testrange\@tempa\@nil}%
-    \fi
-  \fi}
-\def\os@testrange#1+#2\@nil{%
-  \ifnum\c@slide>#1
-    \ifnum\c@slide<#2
-      \if@os\@testtrue\else\@testfalse\fi
-    \fi
-  \fi}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\onlynotestoo}
-%    \begin{macrocode}
-\def\onlynotestoo{%
-  \ifnotes\@testtrue\else\ifnotesonly\@testtrue\else\@testfalse\fi\fi
-  \if@test
-    \@ifundefined{xcomment@@@}{%
-      \edef\sem@temp{\the\catcode`\@}%
-      \catcode`\@=11
-      \@@input xcomment.sty
-      \catcode`\@=\sem@temp\relax}{}%
-    \def\xcomment@hook{\@xcomment{@@@}{\slide@list}}%
-    \addto@hook\after@slide\onlynotes@too
-  \fi}
-\def\onlynotes@too{%
-  \os@test
-  \if@test\gdef\do@end{}\else\gdef\do@end{\xc@begin}\fi}
-\addto@preamblecmds\onlynotestoo
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Font size declarations\label{fontsize}}
-%
-% \begin{macro}{\ptsize}
-% The "\ptsize{"$n$"}" command invokes a macro so that the font size
-% declarations are defined as in "art"$n$".sty", except that the font size
-% declarations only affect the sizes of fonts, and not the list or display
-% parameters. These parameters are set at the beginning of each slide
-% environment. "\ptsize" should only be used in slide environments.
-%    \begin{macrocode}
-\def\ptsize#1{%
-  \@ifundefined{#1@semptsize}%
-    {\@seminarerr{\string\ptsize\space `#1' not valid.}\@eha}%
-    {\ifslide
-      \sem@ptsize{#1}\large\normalsize
-    \else
-      \edef\slide@ptsize{#1}%
-    \fi}}
-\edef\slide@ptsize{1\@ptsize}%
-\def\slidefontsizes{\ptsize} %For backwards compatibility??
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slide@setsize}
-% This is a variant of "\@setsize" that makes the minimum space between lines
-% be "\slideskip" times the extra space between lines.
-%    \begin{macrocode}
-\def\slide@setsize#1#2#3#4{%
-  \@setsize{#1}{#2}{#3}{#4}%
-  \set@slideskip{#2}}
-\def\slide@@setsize#1#2#3#4{%
-  \slide@setsize{#1}{#2}{#3}{#4}\slidedisplayskips}
-\def\set@slideskip#1{%
-  \normallineskiplimit=#1
-  \advance\normallineskiplimit-\normalbaselineskip
-  \multiply\normallineskiplimit-1
-  \normallineskiplimit\slideskip\normallineskiplimit
-  \ifdim\normallineskiplimit<1pt\normallineskiplimit=1pt\fi
-  \normallineskip=\normallineskiplimit
-    minus \slideshrink\normallineskiplimit
-  \dimen@=\normalbaselineskip
-  \normalbaselineskip=\dimen@ minus \slideshrink\normallineskiplimit
-  \normalbaselines}
-\def\slideskip{.75}
-\def\slideshrink{.25}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\slidedisplayskips}
-% "\slidedisplayskips" sets the displays skips to smaller values than they
-% would usually have in the "article" document style.
-%    \begin{macrocode}
-\def\slidedisplayskips{%
-  \abovedisplayskip 1.75ex minus .35ex
-  \belowdisplayskip \abovedisplayskip
-  \abovedisplayshortskip .2ex minus .2ex
-  \belowdisplayshortskip 1ex minus .2ex}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\sem@ptsize}
-%    \begin{macrocode}
-\def\sem@ptsize#1{%
-  \@nameuse{#1@semptsize}%
-  \large\normalsize
-  \leftmargini\slideleftmargini\relax
-  \leftmarginii\slideleftmarginii\relax
-  \leftmarginiii\slideleftmarginiii\relax
-  \labelsep\slidelabelsep\relax
-  \parskip\slideparskip\relax
-  \parindent\slideparindent\relax
-  \slide@rightskip
-  \slide@listi
-  \skip\footins\slidefootins\relax
-  \footnotesep\slidefootnotesep\relax}
-\def\slidefootins{2ex minus .8ex}
-\def\slidefootnotesep{1.2ex}
-\def\slideparindent{\z@}
-\def\slideparskip{1ex minus .2ex}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\8@semptsize}
-%    \begin{macrocode}
-\@namedef{8@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{9.5pt}\viiipt\@viiipt}%
-  \def\small{\slide@@setsize\small{8pt}\viipt\@viipt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{8pt}\vipt\@vipt}%
-  \def\scriptsize{\slide@setsize\scriptsize{7pt}\vipt\@vipt}%
-  \def\tiny{\slide@setsize\tiny{6pt}\vpt\@vpt}%
-  \def\large{\slide@setsize\large{12pt}\xpt\@xpt}%
-  \def\Large{\slide@setsize\Large{14pt}\xiipt\@xiipt}%
-  \def\LARGE{\slide@setsize\LARGE{17pt}\xivpt\@xivpt}%
-  \def\huge{\slide@setsize\huge{20pt}\xviipt\@xviipt}%
-  \def\Huge{\slide@setsize\Huge{25pt}\xxpt\@xxpt}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\9@semptsize}
-%    \begin{macrocode}
-\@namedef{9@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{11pt}\ixpt\@ixpt}%
-  \def\small{\slide@@setsize\small{9.5pt}\viiipt\@viiipt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{8pt}\viipt\@viipt}%
-  \def\scriptsize{\slide@setsize\scriptsize{7pt}\vipt\@vipt}%
-  \def\tiny{\slide@setsize\tiny{6pt}\vpt\@vpt}%
-  \def\large{\slide@setsize\large{12pt}\xpt\@xpt}%
-  \def\Large{\slide@setsize\Large{14pt}\xiipt\@xiipt}%
-  \def\LARGE{\slide@setsize\LARGE{17pt}\xivpt\@xivpt}%
-  \def\huge{\slide@setsize\huge{20pt}\xviipt\@xviipt}%
-  \def\Huge{\slide@setsize\Huge{25pt}\xxpt\@xxpt}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\10@semptsize}
-%    \begin{macrocode}
-\@namedef{10@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{12pt}\xpt\@xpt}%
-  \def\small{\slide@@setsize\small{11pt}\ixpt\@ixpt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{9.5pt}\viiipt\@viiipt}%
-  \def\scriptsize{\slide@setsize\scriptsize{8pt}\viipt\@viipt}%
-  \def\tiny{\slide@setsize\tiny{6pt}\vpt\@vpt}%
-  \def\large{\slide@setsize\large{14pt}\xiipt\@xiipt}%
-  \def\Large{\slide@setsize\Large{18pt}\xivpt\@xivpt}%
-  \def\LARGE{\slide@setsize\LARGE{22pt}\xviipt\@xviipt}%
-  \def\huge{\slide@setsize\huge{25pt}\xxpt\@xxpt}%
-  \def\Huge{\slide@setsize\Huge{30pt}\xxvpt\@xxvpt}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\11@semptsize}
-%    \begin{macrocode}
-\@namedef{11@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{13.6pt}\xipt\@xipt}%
-  \def\small{\slide@@setsize\small{12pt}\xpt\@xpt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{11pt}\ixpt\@ixpt}%
-  \def\scriptsize{\slide@setsize\scriptsize{9.5pt}\viiipt\@viiipt}%
-  \def\tiny{\slide@setsize\tiny{7pt}\vipt\@vipt}%
-  \def\large{\slide@setsize\large{14pt}\xiipt\@xiipt}%
-  \def\Large{\slide@setsize\Large{18pt}\xivpt\@xivpt}%
-  \def\LARGE{\slide@setsize\LARGE{22pt}\xviipt\@xviipt}%
-  \def\huge{\slide@setsize\huge{25pt}\xxpt\@xxpt}%
-  \def\Huge{\slide@setsize\Huge{30pt}\xxvpt\@xxvpt}}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\12@semptsize}
-%    \begin{macrocode}
-\@namedef{12@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{14.5pt}\xiipt\@xiipt}%
-  \def\small{\slide@@setsize\small{13.6pt}\xipt\@xipt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{12pt}\xpt\@xpt}%
-  \def\scriptsize{\slide@setsize\scriptsize{9.5pt}\viiipt\@viiipt}%
-  \def\tiny{\slide@setsize\tiny{7pt}\vipt\@vipt}%
-  \def\large{\slide@setsize\large{18pt}\xivpt\@xivpt}%
-  \def\Large{\slide@setsize\Large{22pt}\xviipt\@xviipt}%
-  \def\LARGE{\slide@setsize\LARGE{25pt}\xxpt\@xxpt}%
-  \def\huge{\slide@setsize\huge{30pt}\xxvpt\@xxvpt}%
-  \let\Huge\huge}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\14@semptsize}
-%    \begin{macrocode}
-\@namedef{14@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{18pt}\xivpt\@xivpt}%
-  \def\small{\slide@@setsize\small{14.5pt}\xiipt\@xiipt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{13.6pt}\xipt\@xipt}%
-  \def\scriptsize{\slide@setsize\scriptsize{12pt}\xpt\@xpt}%
-  \def\tiny{\slide@setsize\tiny{9.5pt}\viiipt\@viiipt}%
-  \def\large{\slide@setsize\large{22pt}\xviipt\@xviipt}%
-  \def\Large{\slide@setsize\Large{25pt}\xxpt\@xxpt}%
-  \def\LARGE{\slide@setsize\LARGE{30pt}\xxvpt\@xxvpt}%
-  \let\huge\LARGE
-  \let\Huge\LARGE}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\17@semptsize}
-%    \begin{macrocode}
-\@namedef{17@semptsize}{%
-  \def\@normalsize{\slide@@setsize\normalsize{22pt}\xviipt\@xviipt}%
-  \def\small{\slide@@setsize\small{18pt}\xivpt\@xivpt}%
-  \def\footnotesize{\slide@@setsize\footnotesize{14.5pt}\xiipt\@xiipt}%
-  \def\scriptsize{\slide@setsize\scriptsize{13.6pt}\xipt\@xipt}%
-  \def\tiny{\slide@setsize\tiny{12pt}\xpt\@xpt}%
-  \def\large{\slide@setsize\large{25pt}\xxpt\@xxpt}%
-  \def\Large{\slide@setsize\Large{30pt}\xxvpt\@xxvpt}%
-  \let\LARGE\Large
-  \let\huge\Large
-  \let\Huge\Large}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{The $\setminus$twoup macro}
-%
-% \begin{macro}{\twoup}
-% See "2up.sty" for details.
-%    \begin{macrocode}
-\def\twoup{\@ifnextchar[{\@twoup}{\@twoup[0]}}
-\ifarticle
-  \ifportrait
-    \def\@twoup[#1]{%
-      \@tempcnta=\the@articlemag\relax
-      \@tempcntb=\@tempcnta
-      \advance\@tempcntb by #1\relax
-      \advance\@tempcntb by -2\relax
-      \ifnum\@tempcntb>-6\relax
-        \@@input 2up.tex
-        \source{\@magstep\@tempcnta}{\paperheight}{\paperwidth}%
-        \target{\@magstep\@tempcntb}{\paperwidth}{\paperheight}%
-        \targetlayout{topbottom}%
-        \printlandscapefalse
-      \else
-        \@seminarerr{Article magnification is too low for
-          \string\twoup\space to handle}\@eha
-      \fi
-      \def\articlemag##1{\@semtwoupmagerr\articlemag}}
-  \else
-    \def\@twoup[#1]{%
-      \@tempcnta=\the@articlemag\relax
-      \@tempcntb=\@tempcnta
-      \advance\@tempcntb by #1\relax
-      \advance\@tempcntb by -2\relax
-      \ifnum\@tempcntb>-6\relax
-        \@@input 2up.tex
-        \source{\@magstep\@tempcnta}{\paperwidth}{\paperheight}%
-        \target{\@magstep\@tempcntb}{\paperheight}{\paperwidth}%
-        \if@twoside
-          \targetlayout{twosided}%
-        \fi
-        \printlandscapetrue
-      \else
-        \@seminarerr{Article magnification is too low for
-          \string\twoup\space to handle}\@eha
-      \fi
-      \def\articlemag##1{\@semtwoupmagerr\articlemag}}
-  \fi
-\else
-  \ifportrait
-    \def\@twoup[#1]{%
-      \@tempcnta=\the@slidesmag\relax
-      \@tempcntb=\@tempcnta
-      \advance\@tempcntb by #1\relax
-      \advance\@tempcntb by -3\relax
-      \ifnum\@tempcntb>-6\relax
-        \@@input 2up.tex
-        \source{\@magstep\@tempcnta}{\paperwidth}{\paperheight}%
-        \advance\@tempcnta by -3
-        \target{\@magstep\@tempcnta}{\paperheight}{\paperwidth}%
-        \printlandscapetrue
-      \else
-        \@seminarerr{Slides magnification is too low for
-          \string\twoup\space to handle}\@eha
-      \fi
-      \def\slidesmag##1{\@semtwoupmagerr\slidesmag}}
-  \else
-    \def\@twoup[#1]{%
-      \@tempcnta=\the@slidesmag\relax
-      \@tempcntb=\@tempcnta
-      \advance\@tempcntb by #1\relax
-      \advance\@tempcntb by -3\relax
-      \ifnum\@tempcntb>-6\relax
-        \@@input 2up.tex
-        \source{\@magstep\@tempcnta}{\paperheight}{\paperwidth}%
-        \target{\@magstep\@tempcntb}{\paperwidth}{\paperheight}%
-        \targetlayout{topbottom}%
-        \printlandscapefalse
-      \else
-        \@seminarerr{Slides magnification is too low for
-          \string\twoup\space to handle}\@eha
-      \fi
-      \def\slidesmag##1{\@semtwoupmargerr\slidesmag}}%
-  \fi
-\fi
-\def\@semtwoupmagerr#1{%
-  \@seminarerr{\string#1 must come before \string\twoup}\@eha}
-\addto@preamblecmds{\twoup\do\@twoup}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \section{Configuration file}
-%
-%    \begin{macrocode}
-\openin1 seminar.con
-\ifeof1\else\closein1 \relax\@@input seminar.con\fi
-%    \end{macrocode}
-%
-\endinput
-% END: seminar.doc
diff --git a/macros/latex/contrib/seminar/src/semlayer.doc b/macros/latex/contrib/seminar/src/semlayer.doc
deleted file mode 100644
index 6cb020b8ea..0000000000
--- a/macros/latex/contrib/seminar/src/semlayer.doc
+++ /dev/null
@@ -1,271 +0,0 @@
-% BEGIN semlayer.doc
-%%
-\def\fileversion{1.0}
-\def\filedate{93/04/01}
-%%
-%% LaTeX style option `semlayer.sty'.
-%% For use with LaTeX v2.09 and the `seminar' document style.
-%%
-%% COPYRIGHT 1993, by Timothy Van Zandt, Timothy.VAN-ZANDT@insead.edu
-%%
-%% This file may be distributed and/or modified under the conditions of
-%% the LaTeX Project Public License, either version 1.2 of this license
-%% or (at your option) any later version.  The latest version of this
-%% license is in:
-%% 
-%%    http://www.latex-project.org/lppl.txt
-%% 
-%% and version 1.2 or later is part of all distributions of LaTeX version
-%% 1999/12/01 or later.
-%%
-%%
-% **************************************************************************
-% This is `semlayer.doc', which contains the documented code for
-% `semlayer.sty'. You can use it in this form as the input file
-% `semlayer.sty'. You can also create a stripped input file using
-% sem-make.tex. You can print the documented code using sem-code.tex.
-% sem-make.tex and sem-code.tex are distributed with seminar.sty.
-% **************************************************************************
-%
-% \EndDocPreamble
-%
-% \CheckSum{276}
-% \CharacterTable
-%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
-%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
-%   Digits        \0\1\2\3\4\5\6\7\8\9
-%   Exclamation   \!     Double quote  \"     Hash (number) \#
-%   Dollar        \$     Percent       \%     Ampersand     \&
-%   Acute accent  \'     Left paren    \(     Right paren   \)
-%   Asterisk      \*     Plus          \+     Comma         \,
-%   Minus         \-     Point         \.     Solidus       \/
-%   Colon         \:     Semicolon     \;     Less than     \<
-%   Equals        \=     Greater than  \>     Question mark \?
-%   Commercial at \@     Left bracket  \[     Backslash     \\
-%   Right bracket \]     Circumflex    \^     Underscore    \_
-%   Grave accent  \`     Left brace    \{     Vertical bar  \|
-%   Right brace   \}     Tilde         \~}
-%
-%
-% \section{Overlays}
-%
-% The main thing that the "\process@slide" macro does is successively send the
-% main slide and then each overlay and layer to a slide output routine. In
-% order to make the definition of that macro easier to understand, we first
-% set up the overlays interface.
-%
-% Overlays must be implemented by some extra macros, such as in
-% "semcolor.sty". Specifically, the commands "\@overlay" and "\make@overlay"
-% should be defined.
-%
-% The reason for including the interface in "seminar.sty" is to encourage
-% those who implement overlays to use a uniform interface, and to illustrate
-% how overlays work. To be honest, though, it may not be possible to implement
-% overlays without PostScript or a graphics language with similar capabilities
-% using the interface that is defined here and without rewriting the basic
-% slides macros.
-%
-% This system of overlays is so good and the system using invisible fonts is
-% so lousy, that no special provisions have been made for supporting the
-% latter. Actually, overlay should (and could easily) be implemented as \TeX{}
-% primitives, saving everyone a lot of trouble.
-%
-% The system for overlays is not explained here in great detail. See
-% "semcolor.sty" and "pstricks.tex" for an example of how overlays can be
-% implemented.
-%
-%    \begin{macrocode}
-\addto@hook\before@newslide{%
-  \global\def\overlay@list{}%
-  \setcounter{overlay}{0}}
-%    \end{macrocode}
-%
-% \begin{macro}{\process@slide,\overlay@loop,\layer@loop}
-% "\process@slide" is the beginning of the ``output'' routine for slides.
-% "\@slidebox" is copied to "\@@slidebox". The "\make@overlay#1" macro should
-% set "\@slidebox" to the contents of "\@@slidebox", but with only the
-% material for overlay "#1" visible.
-%    \begin{macrocode}
-\newbox\@@slidebox
-\def\process@@slide{%
-  \ifx\overlay@list\@empty
-    \finish@slide
-    \output@slide
-  \else
-    \setbox\@@slidebox\box\@slidebox
-    \make@overlay{0}%
-    \finish@slide
-    \output@slide
-    {\let\theoverlay\theslide\layer@loop{0}}%
-    \overlay@loop
-  \fi}
-\def\overlay@loop{%
-  \begingroup
-    \overlay@prep
-    \c@overlay=1
-    \@whilenum\c@overlay<10
-      \do{%
-        \test@member{\the\c@overlay}{\overlay@list}%
-        \if@test
-          \make@overlay{\the\c@overlay}%
-          \finish@slide
-          \output@slide
-        \fi
-        \layer@loop{\the\c@overlay}%
-        \advance\c@overlay by 1}%
-  \endgroup}
-\def\layer@loop#1{%
-  \begingroup
-    \layer@prep
-    \@for\currlayer:=\layer@list\do{%
-    \test@member{#1-\currlayer}{\overlay@list}%
-      \if@test
-        \make@overlay{#1-\currlayer}%
-        \finish@slide
-        \output@slide
-      \fi}%
-  \endgroup}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\layer@prep,\overlay@prep}
-%    \begin{macrocode}
-\def\layer@prep{%
-  \ifarticle\pagestyle{\layer@pagestyle}\fi
-  \let\thepage\thelayer
-  \ifx\thelayerframe\@empty\else\let\theslideframe\thelayerframe\fi
-  \let\slidelabel\layerlabel}
-\def\overlay@prep{%
-  \ifarticle\pagestyle{\overlay@pagestyle}\fi
-  \let\thepage\theoverlay
-  \ifx\theoverlayframe\@empty\else\let\theslideframe\theoverlayframe\fi
-  \let\slidelabel\overlaylabel}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\layerframe,\overlayframe}
-%    \begin{macrocode}
-\def\layerframe{\@slideframe{layer}}
-\def\overlayframe{\@slideframe{overlay}}
-\def\thelayerframe{}
-\def\theoverlayframe{}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\overlaylabel,\layerlabel}
-%    \begin{macrocode}
-\def\overlaylabel{\bf Overlay \theoverlay}
-\def\layerlabel{\bf Layer \thelayer}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\theoverlay,\thelayer}
-%    \begin{macrocode}
-\newcounter{overlay}
-\def\theoverlay{\theslide-\alph{overlay}}
-\def\currlayer{}
-\def\thelayer{\theoverlay-\currlayer}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\ifoverlays,\iflayers}
-% Overlays and layers can be turned on and off independently.
-%    \begin{macrocode}
-\newif\ifoverlays
-\newif\iflayers
-\@ifundefined{@overlay}%
-  {\let\@overlay\relax}%
-  {\ifarticle\else\overlaystrue\layerstrue\fi}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\nooverlays@err,\@overlay}
-% "\@overlay" is set to "\relax" if it is not defined, for easy error
-% detection.
-%    \begin{macrocode}
-\def\nooverlays@err{%
-  \@seminarerr{You need to use additional macros for overlays,
-    e.g., semcolor.sty}\@ehd
-  \global\overlaysfalse
-  \global\layersfalse}
-\@ifundefined{@overlay}{}{}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\overlay}
-% The "\overlay" command starts by checking that the argument is a number
-% between 0 and 9. If so, "\@overlay" is invoked. Except for overlay 0, the
-% counter for cross-references is set to "overlay", and its value is set to
-% the argument of "\overlay".
-%    \begin{macrocode}
-\def\overlay#1{%
-  \ifoverlays\ifx\@overlay\relax\nooverlays@err\fi\fi
-  \ifslide
-    \@tempcnta=#1
-    \@testfalse
-    \ifnum\@tempcnta>-1 \ifnum\@tempcnta<10 \@testtrue\fi\fi
-    \if@test
-      \c@overlay=\@tempcnta
-      \ifnum\c@overlay=0
-        \advance\c@slide by -1
-        \refstepcounter{slide}%
-      \else
-        \advance\c@overlay by -1
-        \refstepcounter{overlay}%
-        \ifoverlays
-          \xdef\overlay@list{\overlay@list,\the\c@overlay}%
-        \fi
-      \fi
-      \ifoverlays
-        \@overlay{\the\c@overlay}%
-      \fi
-    \else
-      \@seminarerr{\string\overlay\space argument must be
-        an integer between 0 and 9}\@eha
-    \fi
-  \else
-    \@seminarerr{\string\overlay\space can only be used
-      in slide environments}\@eha
-  \fi
-  \ignorespaces}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\colorlayers}
-% Color layers use the same mechanism as overlays; only the interface differs.
-%    \begin{macrocode}
-\def\colorlayers#1{%
-  \edef\@tempc{#1}%
-  \edef\layer@list{\layer@list,#1}%
-  \def\@tempa##1{%
-    \@namedef{##1}{%
-      \iflayers\ifx\@overlay\relax\nooverlays@err\fi\fi
-      \ifslide
-        \iflayers
-          \xdef\overlay@list{\overlay@list,\the\c@overlay-##1}%
-          \@overlay{\the\c@overlay-##1}%
-        \fi
-      \else
-        \@seminarerr{Color layer `##1' can only be used in
-          slide environments}\@eha
-      \fi}}
-  \@for\@tempb:=\@tempc\do{%
-    \expandafter\@tempa\expandafter{\@tempb}}}
-\def\layer@list{}
-%    \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\layerpagestyle,\overlaypagestyle}
-%    \begin{macrocode}
-\def\overlaypagestyle#1{\@ifgoodps{#1}{\edef\overlay@pagestyle{#1}}}
-\def\layerpagestyle#1{\@ifgoodps{#1}{\edef\layer@pagestyle{#1}}}
-\overlaypagestyle{}
-\layerpagestyle{}
-%    \end{macrocode}
-% \end{macro}
-%
-\endinput
-% END semlayer.doc