
\documentclass{article}
\usepackage{amsmath}
\begin{document}

This is a changed array.
\[
\begin{array}{ll}
 5_3  < 5^4 & 1 < 2 \\\hline
\end{array}
\]

This is an alignat.

This is text after.

\end{document}

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