\RequirePackage[ngerman=ngerman-x-latest]{hyphsubst} \documentclass[english,ngerman]{tudscrartcl}% andere Klassen sind möglich \usepackage{selinput}\SelectInputMappings{adieresis={ä},germandbls={ß}} \usepackage[T1]{fontenc} \usepackage{babel} \usepackage{microtype} \usepackage{mathswap} \begin{document} \mathswapoff \(4.523,58\) \mathswapon \(4.523,58\) \(4,523.58\) \begingroup \commaswap{\,} \dotswap{,} \(4,523.58\) \endgroup \begingroup% \selectlanguage{english}% \(4,523.58\)\par \(4.523,58\)\par \commaswap{.} \dotswap{\,} \(4.523,58\)% \endgroup \end{document}