%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 11-4-25 on page 779.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

% Show page(s) 1

\documentclass{ttctbeamer}
% graphic converted to gray in book

\StartShownPreambleCommands
\documentclass{beamer}
\usetheme{Berkeley}
\StopShownPreambleCommands

\begin{document}
\begin{frame}
 \frametitle{Demonstration of block environments}
 \framesubtitle{\texttt{block},
      \texttt{alertblock}, \texttt{exampleblock}}
 \begin{block}{Pythagorean Theorem}
   $c^2=a^2 + b^2$
 \end{block}
 \begin{alertblock}{Wrong Pythagoras}
   $c=a + b$
 \end{alertblock}
 \begin{exampleblock}{Square of negative numbers}
   $-3>-4\rightarrow (-3)^2<(-4)^2$
 \end{exampleblock}
\end{frame}
\end{document}