#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: | Keywords: elliptic curve database
optional | Authors: John Cremona
Merged in: | Report Upstream: N/A
Reviewers: | Branch:
Work issues: | Dependencies:
Commit: |
Stopgaps: |
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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.
--
Ticket URL: <http://trac.sagemath.org/ticket/16903>
Sage <http://www.sagemath.org>
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