[XeTeX] breqn + fontspec

Nicolas Vaughan nivaca at gmail.com
Fri Jun 26 00:21:21 CEST 2009

Hi Arno,
That's because breqn calls flexisym, which in turn defines some symbols that
fontspec also defines. This incompatibilty with "font" packages is explained
in the breqn manual. There it says that if you're using cm fonts, mathpazo
(Palatino) or mathptmx (Times), there's a escape route withing flexisym to
avoid clashes. And it adds:

If you find that
> a particular math font package doesn't work then please see implementation
> in
> flexisym.dtx for how to create a support file --- it is easier than one
> might think. Contributions welcome.

So you may fiddle a little with flexisym, as the manual suggests, or else
use other methods of breaking equations. How about manually? That's how I
do. ;>
However, If you create a .sym file to patch flexisym (as flexisym.dtx
describes), please do share your solution.


Nicolas Vaughan

On Thu, Jun 25, 2009 at 3:28 PM, Arno Trautmann <Arno.Trautmann at gmx.de>wrote:

> Hi,
> I’m trying to use breqn with fontspec, but I don’t get it running (one
> for one, they work fine). The following file:
> \documentclass{minimal}
> \usepackage{
>  fontspec,
>  breqn}
> \begin{document}
> test
> \end{document}
> gives the error
>  ! LaTeX Error: Command `\Gamma' already defined.
> Loading breqn *before* fontspec gives
>  ! Missing number, treated as zero.
> <to be read again>
>                   ^
> l.29 \catcode`\^^
>                 A=\catcode`\%
> File versions:
>  breqn.sty    2008/08/13 v0.98a
>  fontspec.sty    2008/08/09 v1.18 Advanced font selection for XeLaTeX
> I nearly understand the problem but had no chance to do anything to get
> it working. What am I doing wrong? Is there really such a big problem
> using theese two packages?
> Is there another methode to break equations for XeTeX?
> Any comments are highly appreciated!
> cheers
> Arno
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