#19091: eclib upgrade to version 20150826 (bugfix)
------------------------------------------+------------------------
Reporter: cremona | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: packages: standard | Resolution:
Keywords: mwrank elliptic curves | Merged in:
Authors: John Cremona | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
------------------------------------------+------------------------
Description changed by cremona:
Old description:
> I fixed a bug in mwrank reported by William Stein and Jen Balakrishnan.
> Before:
> {{{
> sage: "Warning" in mwrank("[0, 0, 0, -532, -4374]")
> True
> }}}
> and
> {{{
> sage: E.rank()
> !!! n3 = 5 not a power of 2, rounding up to 8
> Unable to compute the rank with certainty (lower bound=1).
> This could be because Sha(E/Q)[2] is nontrivial.
> Try calling something like two_descent(second_limit=13) on the
> curve then trying this command again. You could also try rank
> with only_use_mwrank=False.
> ...
> RuntimeError: Rank not provably correct.
> }}}
>
> I have made a new eclib release and will post a patch/branch and a link
> to the new source shortly.
New description:
I fixed a bug in mwrank reported by William Stein and Jen Balakrishnan.
Before:
{{{
sage: "Warning" in mwrank("[0, 0, 0, -532, -4374]")
True
}}}
and
{{{
sage: E = EllipticCurve( [0, 0, 0, -532, -4374])
sage: E.rank()
!!! n3 = 5 not a power of 2, rounding up to 8
Unable to compute the rank with certainty (lower bound=1).
This could be because Sha(E/Q)[2] is nontrivial.
Try calling something like two_descent(second_limit=13) on the
curve then trying this command again. You could also try rank
with only_use_mwrank=False.
...
RuntimeError: Rank not provably correct.
}}}
I have made a new eclib release and will post a patch/branch and a link to
the new source shortly.
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19091#comment:1>
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 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 http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
