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Here's what I did: I have the same problem with long equations in the svjour3 document class. I want to display the long equations as a single column. I tried

\documentclass[twocolumn]{svjour3}          % twocolumn
\usepackage{widetext}
\begin{document}

\begin{widetext}
\begin{eqnarray}
%long equation here
\end{eqnarray}
\end{widetext}


\end{document}

but I get the error message:

! LaTeX Error: Environment widetext undefined.

Please help. Thanks!

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closed as unclear what you're asking by Joseph Wright Aug 8 '13 at 12:40

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Welcome to TeX.SX. A tip: If you indent lines by 4 spaces, then they're marked as a code sample. You can also highlight the code and click the "code" button ({}) or select your code and hit Ctrl+K. –  Claudio Fiandrino Feb 22 '13 at 8:01
    
Without a link for widetext (and presumably svjour3) this is not reproducible. I'm calling 'unclear' as what is needed is more info. –  Joseph Wright Aug 8 '13 at 12:41

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