Thanks!
On Tuesday, September 27, 2022 at 3:02:25 PM UTC+1 Kwankyu wrote:
> This bug is tracked now in
>
> https://trac.sagemath.org/ticket/34591
>
> On Tuesday, September 27, 2022 at 6:31:39 PM UTC+9 wdjo...@gmail.com
> wrote:
>
>> On Tue, Sep 27, 2022 at 4:46 AM John Cremona wrote:
>> >
>>
This bug is tracked now in
https://trac.sagemath.org/ticket/34591
On Tuesday, September 27, 2022 at 6:31:39 PM UTC+9 wdjo...@gmail.com wrote:
> On Tue, Sep 27, 2022 at 4:46 AM John Cremona wrote:
> >
> > Am I doing something stupid here, or is this a bug?
> >
> > sage: R = Integers(8)
> >
There is a serious problem here.
sage: type(RXY)
The base ring of a Singular polynomial should a field. As 8 is not a prime
number, RXY should not be a libsingular polynomial ring!
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To
On Tue, Sep 27, 2022 at 4:46 AM John Cremona wrote:
>
> Am I doing something stupid here, or is this a bug?
>
> sage: R = Integers(8)
> sage: RXY. = R[]
> sage: F = X^3-X^2*Y+X*Y^2+Y^3
> sage: F([4,2])
> 6
> sage: 4^3-4^2*2+4*2^2+2^3
> 56
> sage: (4^3-4^2*2+4*2^2+2^3) % 8
> 0
>
Even after
The iterated subs turns out to be correct
sage: F.subs(X=4).subs(Y=2)
0
sage: F.subs(Y=2).subs(X=4)
0
But not the one shot version (which is supposedly equivalent to the evaluation)
sage: F.subs(X=4, Y=2)
6
There is definitely something wrong!!
Vincent
On Tue, 27 Sept 2022 at 10:46, John
Am I doing something stupid here, or is this a bug?
sage: R = Integers(8)
sage: RXY. = R[]
sage: F = X^3-X^2*Y+X*Y^2+Y^3
sage: F([4,2])
6
sage: 4^3-4^2*2+4*2^2+2^3
56
sage: (4^3-4^2*2+4*2^2+2^3) % 8
0
Why does F not evaluate to 0 mod 8 at X=4, Y=2? Rather obviously, each
of the terms in F(4,2)
