> After changing the command and adding "mathml", now some
> of my latex files no longer compile.

> Please see this MWE

> \documentclass{article}
> \usepackage{amsmath}
> \begin{document}
> $n^\text{th}$
> \end{document}

$n^\text{th}$ is wrong, unsupported syntax. It works (sometimes) but only by 
chance. The correct latex input if you have more than one token in a 
superscript or subscript is to add additional braces:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
$n^{\text{th}}$
\end{document}

With them your example compiles. 

-- 
Mit freundlichen Grüßen
Ulrike Fischer
mailto:[email protected]


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