#16313: easy-to-fix mistake in the stein-watkins optional database docs
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Reporter: was | Owner:
Type: defect | Status: new
Priority: trivial | Milestone: sage-6.4
Component: packages: huge | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: Completely fixed; Fix | Work issues:
reported upstream | Commit:
Branch: | Stopgaps:
Dependencies: |
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Changes (by {'newvalue': u'Jeroen Demeyer', 'oldvalue': ''}):
* author: => Jeroen Demeyer
Old description:
> {{{
> Hi William,
>
> I just downloaded the sage version of the Stein-Watkins database of (a
> subset of) the elliptic curves of conductor < 10^8, because I need a
> supply of small curves with large rational torsion subgroups. I looked
> in
>
> sage/local/share/stein_watkins/format.txt
>
> and it says that the torsion subgroup is given as follows:
>
> torsion_subgroup - n or nx, where n means Z/nZ and nx means Z/2Z x
> Z/2nZ.
>
> But in the actual tables, nx seems to indicate Z/2Z x Z/nZ (instead of
> 2nZ), because the values that appear are 2x, 4x, 6x, and 8x.
>
> I hope all is well with you! Thanks ---
>
> -- Everett
> }}}
New description:
{{{
Hi William,
I just downloaded the sage version of the Stein-Watkins database of (a
subset of) the elliptic curves of conductor < 10^8, because I need a
supply of small curves with large rational torsion subgroups. I looked in
sage/local/share/stein_watkins/format.txt
and it says that the torsion subgroup is given as follows:
torsion_subgroup - n or nx, where n means Z/nZ and nx means Z/2Z x
Z/2nZ.
But in the actual tables, nx seems to indicate Z/2Z x Z/nZ (instead of
2nZ), because the values that appear are 2x, 4x, 6x, and 8x.
I hope all is well with you! Thanks ---
-- Everett
}}}
New '''upstream package''':
[http://boxen.math.washington.edu/home/jdemeyer/spkg/database_stein_watkins-20110713.tar.gz]
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Ticket URL: <http://trac.sagemath.org/ticket/16313#comment:4>
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