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I got the above named error after changing an eqnarray envrmt to align envrmt. I was wondering if align does not work with doc class scrartcl, but the mwe of other users also seem to work like that. Also the error can't be in the formula, as in a sample formula like below the same problem occurs. Any ideas?

\documentclass[a4paper,12pt]{scrartcl}

\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath, amssymb, graphicx}
\usepackage{color}

\newcommand{\eq}{\begin{equation}} %Shortcuts für num. Einzelformel
\newcommand{\eeq}{\end{equation}}
\newcommand{\eqs}{\begin{align}} %Shortcuts für ausgerichtete num. Formelsysteme
\newcommand{\eeqs}{\end{align}}

\begin{document}    

\eqs
a&=b+c\\
de&=fg+hi
\eeqs

\end{document}
Anne Nym
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    Hi, welcome. See https://tex.stackexchange.com/questions/100138/what-is-wrong-with-defining-bal-as-beginalign – Torbjørn T. May 16 '18 at 11:32
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    As you have now learned, making short names for macros is not a good idea. Not only do they not always work, they also make the code harder to read. – daleif May 16 '18 at 11:41
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    See also https://tex.stackexchange.com/a/314533/82917 for a detailed explanation as why this does not work. – campa May 16 '18 at 11:42

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