#19091: eclib upgrade to version 20150826 (bugfix)
-------------------------------------+-------------------------------------
Reporter: cremona | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.9
Component: packages: | Resolution:
standard | Merged in:
Keywords: mwrank elliptic | Reviewers: Jeroen Demeyer
curves | Work issues:
Authors: John Cremona | Commit:
Report Upstream: Fixed upstream, | a28353df91275888f89edb474eae6eb322a39563
in a later stable release. | Stopgaps:
Branch: u/cremona/19091 |
Dependencies: |
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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 = 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, available at
> [http://homepages.warwick.ac.uk/staff/J.E.Cremona/ftp/progs/eclib-20150826.tar.bz2]
> and the branch does the necessary stuff in Sage.
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, available at
[http://homepages.warwick.ac.uk/staff/J.E.Cremona/ftp/progs/eclib-20150827.tar.bz2]
and the branch does the necessary stuff in Sage.
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19091#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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