... turns out that not only SymPy, but also GiNaC has a problem when 
expanding zeta around 1. However, it is more likely for the error to come 
from GiNaC -- so I'll do some more investigations, and then report the 
issue there as well.

In any case, thanks for help!

Best wishes,
Benjamin

Am Dienstag, 7. April 2015 18:26:09 UTC+2 schrieb vdelecroix:
>
> Hello, 
>
> On 07/04/2015, Benjamin Hackl <benjami...@aau.at <javascript:>> wrote: 
> > Hello everybody, 
> > 
> > today I had a look at http://trac.sagemath.org/ticket/15846 and I think 
> I 
> > may have tracked down the issue to SymPy (details in the comments of the 
> > ticket). 
> > Assuming what I found actually is the problem, I'm not quite sure how to 
> > proceed from there (i.e. reporting the issue upstream to SymPy etc.). 
> Could 
> > 
> > someone help me with that? 
>
> As far as I know, sympy works with github and you can provide pull 
> requests. This is what has been done in #18085. 
>
> > Also, is there a way to test how changes to, say, 
> > local/lib/python/site-packages/sympy/functions/special/zeta_functions.py 
> > affect my sage installation? 
>
> As soon as you changed it, just restart sage and you get the new sympy 
> version when doing "import sympy". 
> The more Sagish way to do it is to provide a tarball and modify the 
> install scripts in "$SAGE_ROOT/build/pkgs/sympy/" accordingly. You can 
> also have a look in the developer guide 
>     http://sagemath.org/doc/developer/packaging.html 
>
> Vincent 
>

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