In Beamer the following LaTeX environments are predefined:

`theorem`

`corollary`

`definition`

`example`

`proof`

The Beamer theme controls how this environments are rendered. Here is an example:

% theorems-demo-1.tex \documentclass{beamer} \usetheme{Singapore} \begin{document} \begin{frame}{Theorems and such} \begin{definition} A triangle that has a right angle is called a \emph{right triangle}. \end{definition} \begin{theorem} In a right triangle, the square of the hypotenuse equals the sum of the squares of the two other sides. \end{theorem} \begin{proof} We leave the proof as an exercise to our astute reader. We also suggest that the reader generalize the proof to non-Euclidean geometries. \end{proof} \end{frame} \end{document}

If we change the theme to `\usetheme{Warsaw}`

, the slide changes to:

These environments are actually defined in the `amsmath`

package which is loaded automatically into Beamer. Therefore the
extensive `amsmath`

facilities are available for customizing
them. See the documentation in `amsthdoc.dvi`

that comes with the AMS LaTeX extension packages.^{9}

The standard LaTeX `\newtheorem`

command may be used to extend
the available theorem-like environments. For instance, if you put:

\newtheorem{proposition}{Proposition}

in the preamble, then you can say:

\begin{proposition} ... \end{proposition}

^{9} On the department’s machine, this file is located
in the directory:

` ``/usr/share/texmf/doc/latex/amscls/`

You can view the file using the command:

` ``xdvi`

`/usr/share/texmf/doc/latex/amscls/amsthdoc.dvi`

`&`