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%%  An UIT Edition example
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%%  Example 06-02-12 on page 84.
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%%  Copyright (C) 2010 Herbert Voss
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%%  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.
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%%  See http://www.latex-project.org/lppl.txt for details.
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% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\setcounter{section}{6}
\StartShownPreambleCommands
\usepackage{amsmath} \usepackage[amsmath,thmmarks]{ntheorem}
\theoremsymbol{\ensuremath{\triangle}}
\theoremprework{\bigskip\hrule}  \theorempostwork{\hrule\bigskip}
\newtheorem{example}{example}[section]
\StopShownPreambleCommands
\begin{document}
Normal text before the new environment.
\begin{example} Use of the transformation theorem:
\begin{align*}
 [z^n]C(z) &= [z^n]\biggl[\frac{e^{3/4}}{\sqrt{1-z}}+e^{-3/4}(1-z)^{1/2}+
              \frac{e^{-3/4}}{4}(1-z)^{3/2}+O\Bigl((1-z)^{5/2}\Bigr)\biggr]\\[5pt]
           &= \frac{e^{-3/4}}{\sqrt{\pi n}}-\frac{5e^{-3/4}}{8\sqrt{\pi n^3}}+
              \frac{e^{-3/4}}{128\sqrt{\pi n^5}}+O\biggl(\frac{1}{\sqrt{\pi n^7}}\biggr)
\end{align*}
\end{example}
\end{document}