\documentclass{article}
\begin{document}
\title{Test document for preview}
\author{Author}

\maketitle

\begin{abstract}
Something
\end{abstract}

\section{First section}

Words $a + b = c$ words.

\begin{equation}
    \alpha = \sqrt{ \beta }
\end{equation}

\end{document}

%%% Local Variables:
%%% mode: latex
%%% TeX-PDF-mode: t
%%% TeX-master: t
%%% End:
