The svmono class (available here) butchers spacing inside arrays; compare

\documentclass{svmono}
\begin{document}

$\begin{array}{|l|} text \end{array}$

\end{document}


to the same in the article class. There is very little space between the left line of the array and the text. Does anyone know which length might be involved?

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The distance between the vertical rules and cell contents is specified by \arraycolsep in the array environment. Change this to your liking using
\setlength{\arraycolsep}{<len>}

Default in the document class seems to be 1.5pt, compared to 5pt in article.