#9322: long time in simon_two_descent for elliptic curves
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Reporter: cremona | Owner: AlexGhitza
Type: defect | Status: needs_info
Priority: major | Milestone: sage-6.1
Component: elliptic curves | Resolution:
Keywords: simon_two_descent ecc2011 | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by cremona:
Old description:
> [NB This is a different problem from the one on #5153]
>
> Chris Wuthrich reports:
> {{{
> sage: K.<w> = NumberField(x^2-x-232)
> sage: E = EllipticCurve([2-w,18+3*w,209+9*w,2581+175*w,852-55*w])
> sage: E.local_data()
> []
> sage: E.simon_two_descent(verbose=2)
> }}}
> This takes about 2.5 minutes with Sage 4.7.1 on a 1.6Ghz Core 2 Duo.
>
> The same example runs fine in gp using the same version of the script
> ell.gp that Sage has (in version 4.4.4) and the same version of gp.
New description:
[See #15608 for a list of open simon_two_descent tickets]
[NB This is a different problem from the one on #5153]
Chris Wuthrich reports:
{{{
sage: K.<w> = NumberField(x^2-x-232)
sage: E = EllipticCurve([2-w,18+3*w,209+9*w,2581+175*w,852-55*w])
sage: E.local_data()
[]
sage: E.simon_two_descent(verbose=2)
}}}
This takes about 2.5 minutes with Sage 4.7.1 on a 1.6Ghz Core 2 Duo.
The same example runs fine in gp using the same version of the script
ell.gp that Sage has (in version 4.4.4) and the same version of gp.
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Ticket URL: <http://trac.sagemath.org/ticket/9322#comment:13>
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