On Mon, Nov 15, 2010 at 1:59 PM, Jeroen Demeyer <jdeme...@cage.ugent.be> wrote:
> On 2010-11-15 14:46, luisfe wrote:
>> gp: poly = t^3 + (-4*a^3 + 2*a)*t^2 - 11/3*a^2*t + 2/3*a^3 - 4/3*a
>> t^3 + (-4*a^3 + 2*a)*t^2 - 11/3*a^2*t + (2/3*a^3 - 4/3*a)
>> gp: factornf(poly, a^4 - a^2 +1)
>>
>> [t + Mod(-2*a^3 + a, a^4 - a^2 + 1) 1]
>>
>> [t + Mod(-4/3*a^3 + 2/3*a, a^4 - a^2 + 1) 1]
>>
>> [t + Mod(-2/3*a^3 + 1/3*a, a^4 - a^2 + 1) 1]
>>
>> Which is the correct answer.
>
> True.  I never understood why there exists nffactor() and factornf()
> which do the same thing (but apparently with different implementations!)

According to Karim, one of these is now obsolete and should not be
used.  But I can never remember which....

John


>
> Jeroen.
>
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