\documentclass[dvipsnames,14pt,t]{beamer}
\usepackage{proof}
\usepackage{beamerthemeplainculight}
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\usepackage{mathpartir}
\usepackage{isabelle}
\usepackage{isabellesym}
\usepackage[absolute,overlay]{textpos}
\usepackage{ifthen}
\usepackage{tikz}
\usepackage{courier}
\usepackage{listings}
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\usetikzlibrary{calc}
\usepackage{graphicx} 
\usetikzlibrary{shapes}
\usetikzlibrary{shadows}
\usetikzlibrary{plotmarks}


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\renewcommand{\endisatagproof}{}
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% beamer stuff 
\renewcommand{\slidecaption}{APP 09, King's College London, 3 December 2013}
\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}% for definitions
\newcommand{\bl}[1]{\textcolor{blue}{#1}}

\begin{document}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\mode<presentation>{
\begin{frame}<1>[t]
\frametitle{%
  \begin{tabular}{@ {}c@ {}}
  \\
  \LARGE Access Control and \\[-3mm] 
  \LARGE Privacy Policies (10)\\[-6mm] 
  \end{tabular}}\bigskip\bigskip\bigskip

  %\begin{center}
  %\includegraphics[scale=1.3]{pics/barrier.jpg}
  %\end{center}

\normalsize
  \begin{center}
  \begin{tabular}{ll}
  Email:  & christian.urban at kcl.ac.uk\\
  Of$\!$fice: & S1.27 (1st floor Strand Building)\\
  Slides: & KEATS (also homework is there)\\
  \end{tabular}
  \end{center}

\end{frame}}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     


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\mode<presentation>{
\begin{frame}[c]
\frametitle{Revision: Proofs}

\begin{center}
\includegraphics[scale=0.4]{pics/river-stones.jpg}
\end{center}

\begin{textblock}{5}(11.7,5)
goal
\end{textblock}

\begin{textblock}{5}(11.7,14)
start
\end{textblock}

\begin{textblock}{5}(0,7)
\begin{center}
\bl{\infer[\small\textcolor{black}{\text{axiom}}]{\quad\vdash\quad}{}}\\[8mm]
\bl{\infer{\vdash}{\quad\vdash\quad}}\\[8mm]
\bl{\infer{\vdash}{\quad\vdash\qquad\vdash\quad}}
\end{center}
\end{textblock}

\end{frame}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\mode<presentation>{
\begin{frame}[c]
\frametitle{Proof Example Proof}

\begin{center}
\bl{\infer{P\;\text{says}\;F_1 \wedge Q\;\text{says}\;F_2 \vdash Q\;\text{says}\;F_2 \wedge P\;\text{says}\;F_1}
         {\raisebox{2mm}{\text{\LARGE $?$}}}}
\end{center}


\end{frame}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\mode<presentation>{
\begin{frame}[c]
\frametitle{Proof Example Proof}

\begin{tabular}{@{\hspace{-6mm}}l}
\begin{minipage}{1.1\textwidth}
We have (by axiom)

\begin{center}
\begin{tabular}{@{}ll@{}}
(1) & \bl{$P\;\text{says}\;F_1 \wedge Q\;\text{says}\;F_2 \vdash P\;\text{says}\;F_1 \wedge Q\;\text{says}\;F_2$}
\end{tabular}
\end{center}

From (1) we get

\begin{center}
\begin{tabular}{@{}ll@{}}
(2) & \bl{$P\;\text{says}\;F_1 \wedge Q\;\text{says}\;F_2 \vdash P\;\text{says}\;F_1$}\\
(3) & \bl{$P\;\text{says}\;F_1 \wedge Q\;\text{says}\;F_2 \vdash Q\;\text{says}\;F_2$}\\
\end{tabular}
\end{center}

From (3) and (2) we get

\begin{center}
\begin{tabular}{@{}ll@{}}
\bl{$P\;\text{says}\;F_1 \wedge Q\;\text{says}\;F_2 \vdash Q\;\text{says}\;F_2 \wedge P\;\text{says}\;F_1$}
\end{tabular}
\end{center}

Done.
\end{minipage}
\end{tabular}

\end{frame}}
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\end{document}

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