On 9 November 2016 at 00:25, francisco <portillou...@gmail.com> wrote: > Hello, > > I have been computing modular symbols for distinct curves on the Cremona > data base. > But, in a few curves, I recived a WARNING messages like this: > > Warning : Could not normalize the modular symbols, maybe all further > results will be multiplied by -1, 2 or -2. > > Why sage does not give the exact normalization? Is there a theoretical > reason? > How sage normalize modular symbols?
This may be related to https://trac.sagemath.org/ticket/10256 . The answer to your last question is that it depends on whether they are computed using Sage itself (slower) or my code (=eclib). John Cremona > > > -- > 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 sage-support+unsubscr...@googlegroups.com. > To post to this group, send email to sage-support@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-support. > For more options, visit https://groups.google.com/d/optout. -- 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 sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
