%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 11-4-15 on page 769.
%% 
%%  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) 3,6

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

\StartShownPreambleCommands
\documentclass{beamer}
\usetheme{Malmoe} \usecolortheme{dove}
\useoutertheme{sidebar}
\StopShownPreambleCommands

\begin{document}
\begin{frame}
  \frametitle{Overlay Environments}
  \begin{theorem}<1->[Pythagoras]
    \[ 5^2 = 4^2 + 3^2 \]
  \end{theorem}
  \begin{proof}<2>
    \[ 25 = 16 + 9 = 25 \]
  \end{proof}
  \begin{example}<3>[Derivation]
    \begin{align}
      f(x)     &= \tan x\\
      f^\prime &= 1+\tan^2 x
    \end{align}
  \end{example}
\end{frame}
\begin{frame}
  \frametitle{Overlay Environments}
  \begin{theorem}<1->[Pythagoras]
    \[ 5^2 = 4^2 + 3^2 \]
  \end{theorem}
  \begin{onlyenv}<2>
  \begin{proof}
    \[ 25 = 16 + 9 = 25 \]
  \end{proof}
  \end{onlyenv}
\empty
  \begin{example}<3>[Derivation]
    \begin{align}
      f(x)     &= \tan x\\
      f^\prime &= 1+\tan^2 x
    \end{align}
  \end{example}
\end{frame}
\end{document}