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+% $Header: /cvsroot/latex-beamer/latex-beamer/doc/beamerug-tutorial.tex,v 1.12 2005/04/04 15:27:09 tantau Exp $
+
+% Copyright 2003, 2004 by Till Tantau <tantau@users.sourceforge.net>.
+%
+% This program can be redistributed and/or modified under the terms
+% of the GNU Public License, version 2.
+
+\section{Tutorial: Euclid's Presentation}
+\label{section-tutorial}
+
+This section presents a short tutorial that focuses on those features
+of \beamer\ that you are likely to use when you start using
+\beamer. It leaves out all the glorious details that are explained
+in great detail later on.
+
+
+
+\subsection{Problem Statement}
+
+We wish to help Prof.\ Euclid of the University of Alexandria to
+create a presentation on his latest discovery: There are
+infinitely many prime numbers! Euclid wrote a paper on this and it got
+accepted at the 27th International Symposium on Prime Numbers $-280$
+(ISPN~'80). Euclid wishes to use the \beamer\ class
+to create a presentation for the conference.
+On the conference webpage he found out that he will have twenty
+minutes for his talk, including questions.
+
+
+\subsection{Solution Template}
+
+The first thing Euclid should do is to look for a solution template
+for his presentation. Having a look at
+Section~\ref{section-solutions}, he finds that the file
+\begin{verbatim}
+beamer/solutions/conference-talks/conference-ornate-20min.en.tex
+\end{verbatim}
+might be appropriate. He creates a subdirectories |presentation| in
+the directory that contains the actual paper and copies the solution
+template to this subdirectory, renaming to |main.tex|.
+
+\lyxnote
+If Euclid uses \LyX, he would choose ``New from template'' and pick
+the template file
+\begin{verbatim}
+beamer/solutions/conference-talks/conference-ornate-20min.en.lyx
+\end{verbatim}
+
+He opens the file in his favorite editor. It starts
+\begin{verbatim}
+\documentclass{beamer}
+\end{verbatim}
+which Euclid finds hardly surprising. Next comes a line reading
+\begin{verbatim}
+\mode<presentation>
+\end{verbatim}
+which Euclid does not understand. Since he finds more stuff in the file
+that he does not understand, he decides to ignore all of that for time
+being, hoping that it all serves some good purpose.
+
+
+\subsection{Title Material}
+
+The next thing that seems logical is the place where the |\title|
+command is used. Naturally, he replaces it with
+\begin{verbatim}
+\title{There Is No Largest Prime Number}
+\end{verbatim}
+since this was the title of the paper. He sees that the command
+|\title| also takes an optional ``short'' argument in square brackets,
+which is shown in places where there is little space, but he decides
+that the title is short enough by itself.
+
+Euclid next adjusts the |\author| and |\date| fields as follows:
+\begin{verbatim}
+%\author{Euclid of Alexandria}
+%\date[ISPN '80]{27th International Symposium of Prime Numbers}
+\end{verbatim}
+For the date, he felt that the name was a little long, so a short
+version is given (|ISPN '80|). On second thought, Euclid decides to
+add his email address and replaces the |\author| field as follows:
+\begin{verbatim}
+%\author[Euclid]{Euclid of Alexandria \\ \texttt{euclid@alexandria.edu}}
+\end{verbatim}
+Somehow Euclid does not like the fact that there is no ``|\email|''
+command in \beamer. He decides to write an email to \beamer's author,
+asking him to fix this, but postpones this for later when the
+presentation is finished.
+
+There are two fields that Euclid does not know, but whose meaning he
+can guess: |\subtitle| and |\institute|. He adjusts them. (Euclid does
+not need to use the |\and| command, which is
+used to separate several authors, nor the |\inst| command, which just
+makes its argument a superscript).
+
+\lyxnote
+In \LyX, Euclid just edits the first lines having of the different
+styles like Author or Title or Date. He deletes the optional short
+fields.
+
+
+\subsection{The Title Page Frame}
+
+The next thing in the file that seems interesting is where the first
+``frame'' is created, right after the |\||begin{document}|:
+
+\begin{verbatim}
+\begin{frame}
+ \titlepage
+\end{frame}
+\end{verbatim}
+
+In \beamer, a presentation consists of a series of frames. Each frame
+in turn may consist of several slides (if there is more than one, they
+are called overlays). Normally, everything between |\begin{frame}|
+ and |\end{frame}| is put on a single slide. No page breaking is
+performed. So Euclid infers that the first frame is ``filled'' by the
+title page, which seems quite logical.
+
+\lyxnote
+The title page frame is created automatically by \LyX. All other
+frames start with the style BeginFrame and end either with the style
+EndFrame or, automatically, with the start of the next frame,
+subsection, or section.
+
+
+\subsection{Creating the Presentation PDF File}
+
+Eager to find out how the first page will
+look, he invokes |pdflatex| on his file |main.tex| (twice). He could
+also use |latex| (twice), followed by |dvips|, and then possibly
+|ps2pdf|. Then he uses the Acrobat Reader or |xpdf| to view the
+resulting |main.pdf|. Indeed, the first page contains all the
+information Euclid has provided until now. It even looks quite
+impressive with the colorful title and the rounded corners and the
+shadows, but he is doubtful whether he should leave it like that. He
+decides to address this problem later.
+
+Euclid is delighted to find out that clicking on a section or
+subsection in the navigation bar at the tops hyperjumps there. Also,
+the small symbols at the bottom seem to be clickable. Toying around
+with them for a while, he finds that clicking on the arrows left or
+right of a symbols hyperjumps him backward or forward one slide~/
+frame~/ subsection~/ section. Clicking on the left or right side of
+the symbol hyperjumps to the beginning or end of the frame~/
+subsection~/ section. He finds the symbols quite small, but decides
+not write an email to \beamer's author since he also thinks that
+bigger symbols would be distracting.
+
+\lyxnote
+Euclid chooses View $\to$ PDF to view the resulting presentation. On a
+slow machine, this may take a while. See Section~\ref{section-speedup}
+for ways of speeding up the compilation.
+
+
+\subsection{The Table of Contents}
+
+The next frame contains a table of contents:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{Outline}
+ \tableofcontents
+\end{frame}
+\end{verbatim}
+Furthermore, this frame has an individual title (Outline). A comment
+in the frame says that Euclid might wish to try to add the
+|[pausesections]| option. He tries this, changing the frame to:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{Outline}
+ \tableofcontents[pausesections]
+\end{frame}
+\end{verbatim}
+After re-pdf\LaTeX ing the presentation, he finds that instead of a
+single slide, there are now two ``table of contents slides'' in the
+presentation. On the first of these, only the first section is shown,
+on the second both sections are shown (scanning down in the file,
+Euclid finds that, indeed, there are |\section| commands introducing
+these sections). The effect of the |pausesections| seems to be that
+one can talk about the first section before the second one is
+shown. Then, Euclid can press the down- or right-key, to show the
+complete table of contents and can talk about the second section.
+
+
+\subsection{Sections and Subsections}
+
+The next commands Euclid finds are
+\begin{verbatim}
+\section{Motivation}
+\subsection{The Basic Problem That We Studied}
+\end{verbatim}
+These commands are given \emph{outside} of frames. So Euclid assumes
+that at the point of invocation they have no direct effect, they only
+create entries in the table of contents. Having a ``Motivation''
+section seems reasonable to Euclid, but he changes the |\subsection|
+title.
+
+As he looks at the presentation, he notices that his assumption was
+not quite true: each |\subsection| command seems to insert a frame
+containing a table of contents into the presentation. Doubling back he
+finds the command that causes this: The |\AtBeginSubsection| inserts a
+frame with only the current subsection hilighted at the beginning of
+each section. If Euclid does not like this, he can just delete the
+whole |\AtBeginSubsection| stuff and the table of contents at the
+beginning of each subsection disappear.
+
+The |\section| and |\subsection| commands take optional short
+arguments. These short arguments are used whenever a short form of the
+section of subsection name is needed. While this is in keeping with
+the way \beamer\ treats the optional arguments of things like
+|\title|, it is \emph{different} from the usual way \LaTeX\ treats an
+optional argument for sections (where the optional argument dictates
+what is shown in the table of contents and the main argument dictates
+what is shown everywhere else; in \beamer\ things are exactly the
+other way round).
+
+
+
+\subsection{Creating a Simple Frame}
+
+Euclid then modifies the next frame, which is the first ``real'' frame
+of the presentation, as follows:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{What Are Prime Numbers?}
+ A prime number is a number that has exactly two divisors.
+\end{frame}
+\end{verbatim}
+This yields the desired result. It might be a good idea to put some
+emphasis on the object being defined (prime numbers). Euclid tries
+|\emph| but finds that too mild an emphasis. \beamer\ offers the
+command |\alert|, which is used like |\emph| and, by default, typesets
+its argument in bright red.
+\lyxnote
+The |\alert| command needs to be entered in \TeX-mode, which is
+awkward. It's easier to just paint the text in red.
+
+Next, Euclid decides to make it even clearer that he is giving a
+definition by putting a |definition| environment around the
+definition.
+\begin{verbatim}
+\begin{frame}
+ \frametitle{What Are Prime Numbers?}
+ \begin{definition}
+ A \alert{prime number} is a number that has exactly two divisors.
+ \end{definition}
+\end{frame}
+\end{verbatim}
+Other useful environments like |theorem|, |lemma|, |proof|,
+|corollary|, or |example| are also predefined by \beamer. As in
+|amsmath|, they take optional arguments that they show in
+brackets. Indeed, |amsmath| is automatically loaded by \beamer.
+
+Since it is always a good idea to add examples, Euclid decides to add
+one:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{What Are Prime Numbers?}
+ \begin{definition}
+ A \alert{prime number} is a number that has exactly two divisors.
+ \end{definition}
+ \begin{example}
+ \begin{itemize}
+ \item 2 is prime (two divisors: 1 and 2).
+ \item 3 is prime (two divisors: 1 and 3).
+ \item 4 is not prime (\alert{three} divisors: 1, 2, and 4).
+ \end{itemize}
+ \end{example}
+\end{frame}
+\end{verbatim}
+
+
+\subsection{Creating Simple Overlays}
+
+The frame already looks quite nice, though, perhaps a bit colorful.
+However, Euclid would now like to show the three items one after
+another, not all three right away. To achieve this, he adds |\pause|
+commands after the first and second items:
+\begin{verbatim}
+ \begin{itemize}
+ \item 2 is prime (two divisors: 1 and 2).
+ \pause
+ \item 3 is prime (two divisors: 1 and 3).
+ \pause
+ \item 4 is not prime (\alert{three} divisors: 1, 2, and 4).
+ \end{itemize}
+\end{verbatim}
+
+By showing them incrementally, he
+hopes to focus the audience's attention on the item he is currently
+talking about. On second thought, he deletes the |\pause| stuff once
+more since in simple cases like the above the pausing is rather
+silly. Indeed, Euclids has noticed that good presentations make use of
+this uncovering mechanism only in special circumstances.
+
+\lyxnote
+You add a pause using the Pause style.
+
+Euclid finds that he can also add a |\pause| between the definition
+and the example. So, |\pause|s seem to transcede environments, which
+Euclid finds quite useful. After some experimentation he finds that
+|\pause| only does not work in |align| environments. He immediately
+writes an email about this to \beamer's author, but receives a polite
+answer stating that the implementation of |align| does wicked things
+and there is no fix for this. Also, Euclid is pointed to the last part
+of the user's guide, where a workaround is described.
+
+
+\subsection{Using Overlay Specifications}
+
+The next frame is to show his main argument and is put in a ``Results''
+section. Euclid desires a more complicated overlay behavior for this
+frame: In an enumeration of four points he
+wishes to uncover the points one-by-one, but he wishes the fourth
+point to be shown at the same time as the first. The idea is to
+illustrate his new proof method, namely proof by contradiction, where
+a wrong assumption is brought to a contradiction at the end after a
+number of intermediate steps that are not important at the
+beginning. For this, Euclid uses \emph{overlay specifications}:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{There Is No Largest Prime Number}
+ \framesubtitle{The proof uses \textit{reductio ad absurdum}.}
+
+ \begin{theorem}
+ There is no largest prime number.
+ \end{theorem}
+ \begin{proof}
+ \begin{enumerate}
+ \item<1-> Suppose $p$ were the largest prime number.
+ \item<2-> Let $q$ be the product of the first $p$ numbers.
+ \item<3-> Then $q + 1$ is not divisible by any of them.
+ \item<1-> Thus $q + 1$ is also prime and greater than $p$.\qedhere
+ \end{enumerate}
+ \end{proof}
+ \uncover<4->{The proof used \textit{reductio ad absurdum}.}
+\end{frame}
+\end{verbatim}
+The overlay specifications are given in pointed brackets. The
+specification |<1->| means ``from slide 1 on.'' Thus, the first and
+fourth item are shown on the first slide of the frame, but the other
+two items are not shown. Rather, the second point is shown only from
+the second slide onward. \beamer\ automatically computes the number of slides
+needed for each frame. More generally, overlay specification are lists
+of numbers or number ranges where the start or ending of a range can
+be left open. For example |-3,5-6,8-| means ``on all slides, except
+for slides 4 and~7.''
+
+\lyxnote
+You add overlay specifications to the items by entering \TeX-mode
+(press on the little \TeX\ icon) and writing |<1->|. This \TeX-text
+should be placed right at the beginning of the item.
+
+The |\qedhere| is used to put the \textsc{qed} symbol at the end of
+the line \emph{inside} the enumeration. Normally, the \textsc{qed}
+symbol is automatically inserted at the end of a proof environment,
+but that would be on an ugly empty line here.
+
+The |\item| command is not the only command that takes overlay
+specifications. Another useful command that takes one is the
+|\uncover| command. It only shows its argument on the slides specified
+in the overlay specification. On all other slides, the argument is
+hidden (though it still occupies space). The command |\only| is
+similar and Euclid could also have tried
+\begin{verbatim}
+ \only<4->{The proof used \textit{reductio ad absurdum}.}
+\end{verbatim}
+On non-specified slides the |\only| command simply ``throws its
+argument away'' and the argument does not occupy any space. This leads
+to different heights of the text on the first three slides and of the
+fourth slide. If the text is centered vertically, this will cause the
+text to ``wobble'' and thus |\uncover| should be used. However, you
+sometimes wish things to ``really disappear'' on some slides and then
+|\only| is useful. Euclid could also have used the class option
+|t|, which causes the text in frames to be vertically flushed
+to the top. Then a differing text height does not cause
+wobbling. Vertical flushing can also be achieved for only a single
+frame be by giving the optional argument |[t]| like this to the
+|frame| environment as in
+\begin{verbatim}
+\begin{frame}[t]
+ \frametitle{There Is No Largest Prime Number}
+ ...
+\end{frame}
+\end{verbatim}
+Vice versa, if the |t| class option is given, a frame can be
+vertically centered using the |[c]| option for the frame.
+
+It turns out that certain environments, including the |theorem| and
+|proof| environments above, also take overlay specifications. If such
+a specification is given, the whole theorem or proof is only shown on
+the specified slides.
+
+
+\subsection{Structuring a Frame}
+
+On the next frame, Euclid wishes to contrast solved and open problems
+on prime numbers. Since there is no ``Solved problem'' environment
+similar to the |theorem| environment, Euclid decides to use the
+|block| environment, which allows him to give an arbitrary title:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{What's Still To Do?}
+ \begin{block}{Answered Questions}
+ How many primes are there?
+ \end{block}
+ \begin{block}{Open Questions}
+ Is every even number the sum of two primes?
+ \end{block}
+\end{frame}
+\end{verbatim}
+He could also have defined his own theorem-like environment by putting
+the following in the preamble:
+\begin{verbatim}
+%\newtheorem{answeredquestions}[theorem]{Answered Questions}
+%\newtheorem{openquestions}[theorem]{Open Questions}
+\end{verbatim}
+The optional argument |[theorem]| ensures that these environments are
+numbered the same way as everything else. Since these numbers are not
+shown anyway, it does not really matter whether they are given, but
+it's a good practice and, perhaps, Euclid might need these numbers
+some other time.
+
+An alternative would be nested |itemize|:
+\begin{verbatim}
+\begin{frame}
+ \frametitle{What's Still To Do?}
+ \begin{itemize}
+ \item Answered Questions
+ \begin{itemize}
+ \item How many primes are there?
+ \end{itemize}
+ \item Open Questions
+ \begin{itemize}
+ \item Is every even number the sum of two primes?
+ \end{itemize}
+ \end{itemize}
+\end{frame}
+\end{verbatim}
+Pondering on the problem some more, Euclid decides that it would be
+even nicer to have the ``Answered Questions'' on the left and the
+``Open Questions'' on the right, so as to create a stronger visual
+contrast. For this, he uses the |columns| environment. Inside this
+environment, |\column| commands create new columns.
+\begin{verbatim}
+\begin{frame}
+ \frametitle{What's Still To Do?}
+ \begin{columns}
+ \column{.5\textwidth}
+ \begin{block}{Answered Questions}
+ How many primes are there?
+ \end{block}
+
+ \column{.5\textwidth}
+ \begin{block}{Open Questions}
+ Is every even number the sum of two primes?
+ \end{block}
+ \end{columns}
+\end{frame}
+\end{verbatim}
+Trying this, he is not quite satisfied with the result as the block on
+the left has a different height than the one on the right. He thinks it
+would be nicer if they were vertically top-aligned. So he adds the
+|[t]| option to the |columns| environment.
+
+Euclid is somewhat please to find out that a |\pause| at the end of
+the first column allows him to ``uncover'' the second column only on
+the second slide of the frame.
+
+
+
+\subsection{Adding References}
+
+Euclid decides that he would like to add a citation to his open
+questions list, since he would like to attribute the question to his
+good old friend Christian. Euclid is not really sure whether using a
+bibliography in his talk is a good idea, but he goes ahead anyway.
+
+To this end, he adds an entry to the bibliography, which he
+fortunately already finds in the solution file. Having the
+bibliography in the appendix does not quite suit Euclid, so he removes
+the |\appendix| command. He also notices |<presentation>| overlay
+specification and finds them a bit strange, but they do seem to hurt
+either. Hopefully they do something useful. His bibliography looks
+like this:
+\begin{verbatim}
+ \begin{thebibliography}{10}
+ \bibitem{Goldbach1742}[Goldbach, 1742]
+ Christian Goldbach.
+ \newblock A problem we should try to solve before the ISPN '43 deadline,
+ \newblock \emph{Letter to Leonhard Euler}, 1742.
+ \end{thebibliography}
+\end{verbatim}
+and he can then add a citation:
+\begin{verbatim}
+\begin{block}{Open Questions}
+ Is every even number the sum of two primes?
+ \cite{Goldbach1742}
+\end{block}
+\end{verbatim}
+
+
+
+
+
+\subsection{Verbatim Text}
+
+One another frame, Euclid would like to show a listing of an
+algorithm his friend Eratosthenes has send him (saying he came up with
+it while reorganizing his sieve collection). Euclid normally uses the
+|verbatim| environment and sometimes also similar environments like
+|lstlisting| to typeset listings. He can also use them in \beamer, but
+he must add the |fragile| option to the frame:
+\begin{verbatim}
+\begin{frame}[fragile]
+ \frametitle{An Algorithm For Finding Primes Numbers.}
+
+%\begin{verbatim}
+int main (void)
+{
+ std::vector<bool> is_prime (100, true);
+ for (int i = 2; i < 100; i++)
+ if (is_prime[i])
+ {
+ std::cout << i << " ";
+ for (int j = i; j < 100; is_prime [j] = false, j+=i);
+ }
+ return 0;
+}
+\end{verbatim}
+\unskip{\MacroFont|\end{verbatim}|}
+ %\begin{verbatim}
+\begin{verbatim}
+ \begin{uncoverenv}<2>
+ Note the use of \verb|std::|.
+ \end{uncoverenv}
+\end{frame}
+\end{verbatim}
+
+
+On second thought, Euclid would prefer to uncover part of the
+algorithm stepwise and to add an emphasis on certain lines or parts of
+lines. He can use package like |alltt| for this, but in simple cases
+the environment |{semiverbatim}| defined by \beamer\ is more useful:
+It works like |{verbatim}|, except that |\|, |{|, and |}| retain their
+meaning (one can typeset them by using |\\|, |\{|, and |\}|). Euclid
+might now typeset his algorithm as follows:
+
+\begin{verbatim}
+\begin{frame}[fragile]
+ \frametitle{An Algorithm For Finding Primes Numbers.}
+
+\begin{semiverbatim}
+\uncover<1->{\alert<0>{int main (void)}}
+\uncover<1->{\alert<0>{\{}}
+\uncover<1->{\alert<1>{ \alert<4>{std::}vector<bool> is_prime (100, true);}}
+\uncover<1->{\alert<1>{ for (int i = 2; i < 100; i++)}}
+\uncover<2->{\alert<2>{ if (is_prime[i])}}
+\uncover<2->{\alert<0>{ \{}}
+\uncover<3->{\alert<3>{ \alert<4>{std::}cout << i << " ";}}
+\uncover<3->{\alert<3>{ for (int j = i; j < 100;}}
+\uncover<3->{\alert<3>{ is_prime [j] = false, j+=i);}}
+\uncover<2->{\alert<0>{ \}}}
+\uncover<1->{\alert<0>{ return 0;}}
+\uncover<1->{\alert<0>{\}}}
+\end{semiverbatim}
+
+ \visible<4->{Note the use of \alert{\texttt{std::}}.}
+\end{frame}
+\end{verbatim}
+
+The |\visible| command does nearly the same as |\uncover|. A
+difference occurs if the command |\setbeamercovered{transparent}| has
+been used to make covered text ``transparent'' instead, |\visible| still makes the text
+completely ``invisible'' on non-specified slides. Euclid has
+the feeling that the naming convention is a bit strange, but cannot
+quite pinpoint the problem.
+
+\subsection{Changing the Way Things Look I: Theming}
+
+With the contents of this talk fixed, Euclid decides to have a second
+look at the way things look. He goes back to the beginning and finds
+the line
+\begin{verbatim}
+\usetheme{Warsaw}
+\end{verbatim}
+By substituting other cities (he notices that these cities seem to
+have in common that there has been a workshop or conference on
+theoretical computer science there at which always the same person had
+a paper, attended, or gave a talk) Euclid can change the way his
+presentation is going to look. He decides to choose some theme that is
+reasonably simple but, since his talk is not too short, shows a bit of
+navigational information.
+
+He settles on the |Frankfurt| theme but decides that the light-dark
+contrast is too strong. He adds
+\begin{verbatim}
+\usecolortheme{seahorse}
+\usecolortheme{rose}
+\end{verbatim}
+The result seems some more subdued to him.
+
+Euclid decides that the font used for the titles is not quite
+classical enough (classical fonts are the latest chic in
+Alexandria). So, he adds
+\begin{verbatim}
+\usefonttheme[onlylarge]{structuresmallcapsserif}
+\end{verbatim}
+
+Euclid notices that the small fonts in the navigation bars
+are a bit hard to read as they are so thin. Adding the following
+helps:
+\begin{verbatim}
+\usefonttheme[onlysmall]{structurebold}
+\end{verbatim}
+
+
+\subsection{Changing the Way Things Look II: Colors and Fonts}
+
+Since Euclid wants to give a \emph{perfect} talk, he decides that the
+font used for the title simply has to be a serif italics. To change
+only the font used for the title, Euclid uses the following command:
+\begin{verbatim}
+\setbeamerfont{title}{shape=\itshape,family=\rmfamily}
+\end{verbatim}
+He notices that the font is still quite large (which he likes), but
+wonders why this is the case since he did not specify this. The reason
+is that calls of |\setbeamerfont| accumulate and the size was already
+set to |\large| by some font theme. Using the starred version of
+|\setbeamerfont| ``resets'' the font.
+
+Euclid decides that he would also like to change the color of the
+title to a dashing red, though, perhaps, with a bit of black added. He
+uses the following command:
+\begin{verbatim}
+\setbeamercolor{title}{fg=red!80!black}
+\end{verbatim}
+Trying the following command, Euclid is delighted to find that
+specifying a background color also has an effect:
+\begin{verbatim}
+\setbeamercolor{title}{fg=red!80!black,bg=red!20!white}
+\end{verbatim}
+
+
+Finally, Euclid is satisfied with the presentation and goes ahead and
+gives a great talk at the conference, making many new friends. He also
+writes that email to \beamer's author containing that long list of
+things that he missed in \beamer\ or that do not work. He is a bit
+disappointed to learn that it might take till ISPN~'79 for all these
+things to be taken care of, but he also understands that \beamer's
+author also needs some time to do research or otherwise he would have
+nothing to given presentations about.
+
+%%% Local Variables:
+%%% mode: latex
+%%% TeX-master: "beameruserguide"
+%%% End: