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%%  Ein Beispiel der DANTE-Edition
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%%  Beispiel 09-06-37 auf Seite 432.
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%%  Copyright (C) 2011 Herbert Voss
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands

\StopShownPreambleCommands
\begin{document}
\[ 7a_{11}^{13}+a_1^{}x+a_0 \quad x^{2}+y^2 = r^2 \quad a_{i-1}+a_{i+1}<a_i \]
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\[ ((x^2)^3)^4 = {({(x^2)}^3)}^4 = {\left({\left(x^2\right)}^3\right)}^4 \]
\end{document}