On Wednesday, December 3, 2014 3:07:14 AM UTC-8, Jakob Kroeker wrote:
>
>             ...
> sage: f=x^4+1/(b*zzz) 
> sage: f._singular_()  #  where is the fraction 1/(b*zzz)  ? 
> x^4
>
...
>
see also 
> http://ask.sagemath.org/question/25083/bug-in-roots/
>

That looks problematic, but is likely a different issue from what happens 
on the asksage question. I think we use libsingular for pretty much all 
internal singular uses. We don't use the expect interface to singular for 
communication there.

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