\documentclass{article}
\usepackage{makeidx} \makeindex \title{An Example} \author{Some One} \begin{document} \maketitle \section{A Title} Some \index{content} content. \section{Another Title} Another \index{content} content. \subsection{More} \index{Text} Text. \subsection{Some Math} \[x = \left\{ \begin{array}{ll} {-b \pm \sqrt{b^2-4ac} \over 2a} & \mbox{if $b^2 \geq 4ac$} \\ \mbox{undefined} & \mbox{otherwise} \end{array} \right. \] \printindex \end{document}
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