On Thu, 13 Dec 2018 at 16:42, Vincent Delecroix <20100.delecr...@gmail.com> wrote:
> Le 13/12/2018 à 17:17, Jeroen Demeyer a écrit : > > On 2018-12-13 13:11, John Cremona wrote: > >> The problem is that t is a pari gen and Sage tries too hard to compare > >> that with python 0. > > > > This has nothing to do with Sage or Python, the "problem" is that PARI > > considers [0] and 0 equal. > > Which make sense if you think of [0] as a polynomial of degree 0, and > more generally as the zero vector. Sage does the same to some extent > > sage: 0 == vector([0]) > True > sage: 0 == QQ['x'].zero() > True > > > Personally, I think that Sage (really the package cypari2 which > > implements the PARI <-> Python interface) should follow the PARI > > semantics, even if they are dubious. > > +1 > Well that makes fixing this easier since all we need to do is change one line in the is_isomorphic() method. I assume that you agree that there is a top-level bug at least! John > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
