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+%%
+%% Ein Beispiel der DANTE-Edition
+%% Mathematiksatz mit LaTeX
+%% 3. Auflage
+%% Beispiel A-02-1 auf Seite 402.
+%% Copyright (C) 2018 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[10pt]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+%StartShownPreambleCommands
+\usepackage{axessibility}
+\usepackage{libertine}
+%StopShownPreambleCommands
+\begin{document}
+The golden mean is the number \[ \frac{1 + \sqrt{5}}{2}, \] that is the root larger in modulus of
+\begin{equation} x^2 - x - 1. \end{equation} It is usually defined as the ratio of two lengths
+\(a\) and \(b\) such that \begin{equation*} (a+b) : a = a : b. \end{equation*}
+Let \(x\) be the ratio \( \frac{a}{b} \), we have \( \frac{a+b}{a} = 1 + \frac{1}{x} \),
+from which we get the equation \(x^2 = x + 1\).
+\end{document}