On Tuesday 02 October 2001 13:42, Myriam Abramson wrote:
> Hi!
>
> I'm trying to put a box around a description (describing an
> algorithm with keywords) but I get errors even in the tex file!


\fbox is fragile, if I remember rightly.  You can get out of this by using a 
minipage.  Put something like this in your preamble:

 \newenvironment{myBox}{%
      \vspace{4mm}
      \noindent%
      \begin{lrbox}{\@tempboxa}%
      \begin{minipage}[c]{0.5\columnwidth}%
    }{%
      \end{minipage}%
      \end{lrbox}%
       \centering
      \fbox{\parbox{0.5\columnwidth}{\usebox{\@tempboxa}}}\\%
      \vspace{4mm}
      }%

This is adapted a little from one of Herbert's bits of LaTeX wizardry - 
you'll probably want to play with it to get your box the right size and in 
the right position.

Robin

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