#9266: bug in global_integral_model for Elliptic Curves over Number Fields
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Reporter: wuthrich | Owner: cremona
Type: defect | Status: new
Priority: minor | Milestone: sage-4.4.5
Component: elliptic curves | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The following illustrates the bug. It should be easy to fix.
{{{
sage: K.<s> = NumberField(x^2-5)
sage: w = (1+s)/2
sage: E = EllipticCurve(K,[2,w])
sage: E.global_integral_model()
...sage/schemes/elliptic_curves/ell_number_field.pyc in
global_integral_model(self)
377 ai = [ai[i]/pi**(e*[1,2,3,4,6][i]) for i in
range(5)]
378 for z in ai:
--> 379 assert z.denominator() == 1, "bug in
global_integral_model: %s" % ai
380 return EllipticCurve(list(ai))
381
TypeError: not all arguments converted during string formatting
}}}
So there are two problems. One that the string is not correctly formatted,
the other that it is raised. The latter, I believe, is just because the
wrong thing is tested:
{{{
sage: w.denominator()
2
sage: w.is_integral()
True
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9266>
Sage <http://www.sagemath.org>
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