#14476: non-integral models can cause a bug in local_data for elliptic curves
over
number fields
---------------------------+-----------------------------------------------
Reporter: | Owner: cremona
wuthrich | Status: needs_work
Type: defect | Milestone: sage-5.12
Priority: major | Resolution:
Component: | Merged in:
elliptic curves | Reviewers: Frédéric Chapoton, John Cremona
Keywords: | Work issues:
local_data | Commit:
Authors: Chris | Stopgaps:
Wuthrich |
Report Upstream: N/A |
Branch: |
Dependencies: |
---------------------------+-----------------------------------------------
Changes (by jdemeyer):
* status: positive_review => needs_work
Comment:
Does the algorithm depend on choices? On arando (32-bit Ubuntu 13.04):
{{{
sage -t --long devel/sage/sage/schemes/elliptic_curves/ell_number_field.py
**********************************************************************
File "devel/sage/sage/schemes/elliptic_curves/ell_number_field.py", line
605, in
sage.schemes.elliptic_curves.ell_number_field.EllipticCurve_number_field.global_integral_model
Failed example:
E.global_integral_model()
Expected:
Elliptic Curve defined by y^2 + (-18*g^3+29*g^2+63*g+7)*x*y +
(-704472*g^3-958584*g^2-166242*g+298101)*y = x^3 +
(-2859*g^3-3978*g^2-669*g+1332)*x^2 over Number Field in g with defining
polynomial t^4 - t^3 - 3*t^2 - t + 1
Got:
Elliptic Curve defined by y^2 + (-5*g^3+g^2+9*g+5)*x*y +
(57305*g^3+78489*g^2+14025*g-24161)*y = x^3 +
(-541*g^3-738*g^2-126*g+232)*x^2 over Number Field in g with defining
polynomial t^4 - t^3 - 3*t^2 - t + 1
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/14476#comment:17>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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