#19091: eclib upgrade to version 20150826 (bugfix)
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Reporter: cremona | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: packages: | Keywords: mwrank elliptic curves
standard | Authors: John Cremona
Merged in: | Report Upstream: N/A
Reviewers: | Branch:
Work issues: | Dependencies:
Commit: |
Stopgaps: |
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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.
--
Ticket URL: <http://trac.sagemath.org/ticket/19091>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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