On Nov 22, 2016, at 05:40 , Dima Pasechnik wrote:
>
> On Tuesday, November 22, 2016 at 12:19:37 PM UTC, Sho Takemori wrote:
>>
>> Thank you very much for your explanation. I have seen your post at
>> sage-devel before, but completely forgot it.
>>
>> I guess it would be better to raise an error or print a message than to
>> return a wrong result, if it is a known bug and not fixed yet.
>>
>
> In fact, Singular 4.0.3 (now in Sage 7.5.beta3)
> does the right thing:
>
>> ring r=0,(a),ls;
>> (1/2+a)/(1+2*a);
> 1/2
>
> (same if I use more variables while defining r, not just one)
>
> Thus I guess Sage does not get from Singular the data right...
I see the same with Singular 3.1.3:
$ Singular
SINGULAR / Development
A Computer Algebra System for Polynomial Computations / version 3-1-3
0<
by: W. Decker, G.-M. Greuel, G. Pfister, H. Schoenemann \ March 2011
FB Mathematik der Universitaet, D-67653 Kaiserslautern \
// ** executing /SandBox/Justin/sb/Singular/3-1-3/LIB/.singularrc
> ring R=0,x,dp;
// ** redefining R **
> poly f1=(1/2)+x;
> poly f2=1+2*x;
> f1/f2;
1/2
FWIW.
Justin
--
Justin C. Walker, Curmudgeon at Large
Institute for the Absorption of Federal Funds
-----------
I want to die, peacefully in my sleep, like my grandfather;
not screaming in terror, like his passengers.
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/sage-support.
For more options, visit https://groups.google.com/d/optout.
