I've had time to find the origin of the bug: It appears to be a bug in
Pari 2.11.0 (cf below). I've submitted a bug report.
? f = x^20 - 15*x^19 + 70989*x^18 - 1646113*x^17 + 3890074283*x^16 -
199035549796*x^15 + 203804256639644*x^14 - 10657741285726487*x^13 +
9779630086245476401*x^12 - 457685
One could use 'git bisect' to narrow the problem down to a particular commit.
Just in case...
On Fri, Sep 14, 2018 at 12:16 PM Bruno Grenet wrote:
>
> I've also tested on Ubuntu with gcc. Actually, I run new tests: The bug
> appears between 8.4beta2 (where it's still ok) and 8.4beta3. I'll try to
I've also tested on Ubuntu with gcc. Actually, I run new tests: The bug
appears between 8.4beta2 (where it's still ok) and 8.4beta3. I'll try to
find the the origin of the bug.
Bruno
Le 14/09/2018 à 10:38, Dima Pasechnik a écrit :
It might be a platform dependent bug. I guess John is working
It might be a platform dependent bug. I guess John is working on some
Ubunty machine, using gcc.
Please provide compiler details you're using, too...
On Fri, Sep 14, 2018 at 9:25 AM Bruno Grenet wrote:
>
> Which version of SageMath are you using? I am unable to reproduce the
> bug neither on 8
Which version of SageMath are you using? I am unable to reproduce the
bug neither on 8.3beta7 nor on 8.4beta2.
Bruno
Example with 8.4beta2:
sage: x = polygen(QQ)
sage: f = x^20 - 15*x^19 + 70989*x^18 - 1646113*x^17 + 3890074283*x^16 -
199035549796*x^15 + 203804256639644*x^14 - 10
: 657741
I have two polynomials of degree 20 defining the same number field (I
obtained the second from the first using pari's polredbest() routine). I
am able to use is_isomorphic() to find isomorphisms between them (there are
2) but embeddings() raises an error since roots() does:
sage: x = polygen(QQ)
