#8498: bug in has_good_reduction for a point on an elliptic curve over a number
field
-------------------------------+--------------------------------------------
Reporter: wuthrich | Owner: cremona
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.4
Component: elliptic curves | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by wuthrich):
More precisely, I get the error
{{{
/home/pmzcw/prog/sage/local/lib/python2.6/site-
packages/sage/schemes/elliptic_curves/ell_point.pyc in
has_good_reduction(self, P)
1554 F = Emin.defining_polynomial()
1555 for v in F.variables():
-> 1556 if F.derivative(v)(xyz).valuation(P) == 0:
1557 return True
1558 return False
/home/pmzcw/prog/sage/local/lib/python2.6/site-
packages/sage/structure/element.so in
sage.structure.element.Element.__getattr__
(sage/structure/element.c:2743)()
/home/pmzcw/prog/sage/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.getattr_from_other_class
(sage/structure/parent.c:2844)()
/home/pmzcw/prog/sage/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.raise_attribute_error
(sage/structure/parent.c:2611)()
AttributeError:
'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'
object has no attribute 'valuation'
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8498#comment:1>
Sage <http://www.sagemath.org>
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