easy-to-fix mistake in the stein-watkins optional database docs

[williamstein]

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

We simply need the updated format.txt from http://modular.math.washington.edu/ecdb/

New upstream package: http://boxen.math.washington.edu/home/jdemeyer/spkg/database_stein_watkins-20110713.tar.gz

Upstream: Fixed upstream, but not in a stable release.

CC: @williamstein

Component: packages: huge

Author: Jeroen Demeyer

Branch/Commit: 2ae0cda

Reviewer: Volker Braun

Issue created by migration from https://trac.sagemath.org/ticket/16313

[jdemeyer]

Upstream: Completely fixed; Fix reported upstream

[jdemeyer]

comment:3

This is fixed upstream (http://modular.math.washington.edu/ecdb/format.txt), so we should add the right format.txt in the package.

[jdemeyer]

Author: Jeroen Demeyer

[jdemeyer]

Branch: u/jdemeyer/ticket/16313

[jdemeyer]

New commits:

2ae0cda

Update format.txt in Stein--Watkins database

[jdemeyer]

Commit: 2ae0cda

[jdemeyer]

Changed upstream from Completely fixed; Fix reported upstream to Fixed upstream, but not in a stable release.

[vbraun]

Reviewer: Volker Braun

[vbraun]

Changed branch from u/jdemeyer/ticket/16313 to 2ae0cda