#16903: bugfix for database_cremona_ellcurve optional spkg
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Reporter: cremona | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-6.4
Component: packages: optional | Resolution:
Keywords: elliptic curve database | Merged in:
Authors: John Cremona | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by cremona:
Old description:
> The following (requires optional database_cremona_ellcurve) reveals a
> problem:
> {{{
> sage: CremonaDatabase().largest_conductor()
> 349999
> sage: E = EllipticCurve([0,1,0,-141083,-20443787])
> sage: E.conductor()
> 246400
> sage: E.label()
> ...
> RuntimeError: Cremona label not known for Elliptic Curve defined by y^2 =
> x^3 + x^2 - 141083*x - 20443787 over Rational Field.
> sage: E = EllipticCurve([0,-1,0,-16,421])
> sage: E.conductor()
> 252840
> sage: E.label()
> RuntimeError: Cremona label not known for Elliptic Curve defined by y^2 =
> x^3 - x^2 - 16*x + 421 over Rational Field.
> }}}
> which was reported by Benjamin Matschke and Rafael von Kanel on
> 2014-08-28. The database files are missing all curves with conductors in
> the ranges 246400-246499 and 252800-252899, in total 1455 elliptic curves
> in 962 isogeny classes. I am making an update to the
> database_cremona_ellcurve option spkg.
New description:
The following (requires optional database_cremona_ellcurve) reveals a
problem:
{{{
sage: CremonaDatabase().largest_conductor()
349999
sage: E = EllipticCurve([0,1,0,-141083,-20443787])
sage: E.conductor()
246400
sage: E.label()
...
RuntimeError: Cremona label not known for Elliptic Curve defined by y^2 =
x^3 + x^2 - 141083*x - 20443787 over Rational Field.
sage: E = EllipticCurve([0,-1,0,-16,421])
sage: E.conductor()
252840
sage: E.label()
RuntimeError: Cremona label not known for Elliptic Curve defined by y^2 =
x^3 - x^2 - 16*x + 421 over Rational Field.
}}}
which was reported by Benjamin Matschke and Rafael von Kanel on
2014-08-28. The database files are missing all curves with conductors in
the ranges 246400-246499 and 252800-252899, in total 1455 elliptic curves
in 962 isogeny classes. I am making an update to the
database_cremona_ellcurve option spkg.
New tarball :
*
http://boxen.math.washington.edu/home/cremona/database_cremona_ellcurve-20140829.tar.bz2
--
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Ticket URL: <http://trac.sagemath.org/ticket/16903#comment:2>
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