On Wednesday, October 3, 2018 at 7:35:08 PM UTC+10, Kwankyu Lee wrote:
>
>
>
> On Wednesday, October 3, 2018 at 3:14:32 PM UTC+9, tsc...@ucdavis.edu 
> wrote:
>>
>> I believe there is a Heisenbug in src/sage/rings/function_field/ideal.py. 
>> Here is a specific test that can sometimes fail:
>>
>> sage: K.<x> = FunctionField(GF(3^2)); R.<t> = K[]
>> sage: F.<y> = K.extension(t^3 + t^2 - x^4)
>> sage: Oinf = F.maximal_order_infinite()
>> sage: I = Oinf.ideal(1/y)
>> sage: I.factor()   # This will sometimes fail
>>
>> ---------------------------------------------------------------------------
>> TypeError                                 Traceback (most recent call 
>> last)
>>
>> I suspect people without meataxe will not have this failure. 
>>
>
> Perhaps true. I must be the person who ran this test most number of times 
> and I never encountered this failure. 
>

Okay, that is good to know. Do you know offhand (i.e., don't spend much 
time on this) of a simple way I can extract out the relevant matrix 
computation? This is not a minimal example, and it would be useful to get 
it down smaller.

I created https://trac.sagemath.org/ticket/26389 (Simon, I have cc-ed you).

Best,
Travis

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