Hi Nils,

On 2016-05-30, Nils Bruin <nbr...@sfu.ca> wrote:
> On Monday, May 30, 2016 at 9:55:16 AM UTC-7, Alec Edgington wrote:
>>
>> On Monday, 30 May 2016 17:19:54 UTC+1, Nils Bruin wrote:
>>>
>>> Currently, u.__cmp__ uses the former to test equality, and it should 
>>> probably use the latter. The reasoning is argued in the code. It looks like 
>>> univariate polynomial ideals should just get a containment test implemented
>>>
>>
>> Thanks, that seems to be the problem. I also note the code comment "The 
>> whole quotient stuff relies in I.reduce(x) returning a normal form of x 
>> with respect to I.". Evidently this is not a good assumption!
>>
> This is now http://trac.sagemath.org/ticket/20722 . First try is there. 
> Some unexpected consequences (the univariate problem might have been solved 
> already). An expert on quotients of "letterplace" free algebras is required.

I thought that letterplace does provide a normal form. Does it not?

Best regards,
Simon

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