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+%%
+%% An UIT Edition example
+%%
+%% Example 10-06-3 on page 209.
+%%
+%% Copyright (C) 2010 Herbert Voss
+%%
+%% 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[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\let\dst\displaystyle
+\StopShownPreambleCommands
+\begin{document}
+\[ \binom{n}{k} = \dfrac{\dst\prod_{i=1}^n i}
+ {\dst\prod_{i=1}^k i\dst\prod_{i=1}^{n-k} i} \]
+The Euclidean algorithm: if $a>b$ are integers then $\gcd(a,b)=\gcd(a\bmod b,b)$.
+If $\prod_{i=1}^n p^{e_i}_i$ is the prime factorization of $x$ then
+\[ S(x)=\sum_{d\vert x}d=\prod_{i=1}^n{p^{e_i+1}_i-1\over p_i-1}. \]
+\end{document}