The elliptic curve in your example is not integral, but can be made so by scaling with u=2^4 * 306280853 * 830500407109015815207935972981995995737.
The reason why "algorithm='sage'" is not finishing is that it is factoring the discriminant of the integral model, which is 1034 digits: sage: E.integral_model().discriminant() 16584325703986087246952034622241718096115394871642329304111056809124144469066962067797995787471689425653221421125532545395440766540474130854665609828926253985724268997852308333730744333809856929864537554188224909157048286940833634822589471637273045391352383594594257191548009194924996646368685694226249047945689105859227022080988482400792131822622074198396383383716212349200752936310017891047848060681855164983964530536489450287141991349591370023400797974650162135344458989155242914954912255178061520806095676951250638001638113548051205044104842858788249650536823624644541784506132533495091372032707465466979660203307588384982883492569819266062680359960152987812152626219954280820471914250838680357411030384030274769488308710688892949523316429552662613550062899470142305870722511938688846856542573414637365248768550711140184098392467324614315706199580891612557761748399145841585478809965517245941828310980429209392456080679993410069764480068925239211521554762832605368849026971243237321194341798504797699355912710558777556288533430272 so clearly any method which does not need to do this will be better, and conversely any operation which requires factorization of the discriminant will struggle. John On 26 November 2014 at 20:47, <drazi...@gmail.com> wrote: > > Thank you for your answers. > KD > > -- > 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 http://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 http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
