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\documentclass%:default:classopt:[%{beamer}
%:default:pkgs:%
%\usetheme{Malmoe}
\usetheme{AnnArbor}
%\usecolortheme{seahorse}
%\usecolortheme{rose}
%\usecolortheme{orchid}
% You must set \author before \begin{document}, because beamer uses it to set
% the author field in PDF, which fails if \author is set after \begin{document}.
% But pay attention, babel is not active here so "o (and the like) do not work.
\author{your name}
\begin{document}
\title{The title of your presentation}
\subtitle{Maybe, a subtitle}
\date{1970-01-01}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}
\tableofcontents
\end{frame}
\section{A proof}
\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-| alert@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}
\end{frame}
\end{document}
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