#9322: bug in simon_two_descent for elliptic curves
-------------------------------+--------------------------------------------
Reporter: cremona | Owner: AlexGhitza
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.7
Component: elliptic curves | Keywords: Simon
Author: | Upstream: Not yet reported upstream; Will
do shortly.
Reviewer: | Merged:
Work_issues: |
-------------------------------+--------------------------------------------
Changes (by cremona):
* keywords: => Simon
* status: needs_work => needs_info
* upstream: N/A => Not yet reported upstream; Will do shortly.
Comment:
With 4.7.alpha1 this works fine:
{{{
sage: K.<w> = NumberField(x^2-x-232)
sage: E = EllipticCurve([2-w,18+3*w,209+9*w,2581+175*w,852-55*w])
sage: E.local_data()
[]
sage: E.simon_two_descent()
(0, 2, [])
}}}
but after #11005 (which updates to a newer version of Simon's GP scripts)
we run into an infinite loop:
{{{
**** Warning: doubling the real precision in nfsign_s **** 76
**** Warning: doubling the real precision in nfsign_s **** 152
**** Warning: doubling the real precision in nfsign_s **** 76
**** Warning: doubling the real precision in nfsign_s **** 152
**** Warning: doubling the real precision in nfsign_s **** 76
}}}
which I will test on a stand-alone gp and report upstream.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9322#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
