#15767: Upgrade PARI to 2.7.1
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: packages: | Resolution:
standard | Merged in:
Keywords: | Reviewers:
Authors: Jeroen Demeyer | Work issues:
Report Upstream: N/A | Commit:
Branch: | e5bdf4ccc2bab46b98c096e3cbb15dd0f942623e
u/jdemeyer/ticket/15767 | Stopgaps:
Dependencies: #15888, #15855 |
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Comment (by pbruin):
Replying to [comment:98 jdemeyer]:
> We have a new regression (in a doctest added by #8828):
> {{{
> sage: K.<a> = NumberField(x^3-2)
> sage: E = EllipticCurve([0,0,0,0,a])
> sage: E.gens()
> []
> }}}
>
> This used to return
> {{{
> sage: K.<a> = NumberField(x^3-2)
> sage: E = EllipticCurve([0,0,0,0,a])
> sage: E.gens()
> [(1/3*a^2 + a + 5/3 : -2*a^2 - 4/3*a - 5/3 : 1)]
> }}}
The parameter `lim1` for Simon's 2-descent program needs to be adjusted
(default is 2, minimal value for which a point is found is now apparently
5):
{{{
#!diff
diff --git a/src/sage/schemes/elliptic_curves/height.py
b/src/sage/schemes/elliptic_curves/height.py
index 8d0ef41..6917594 100644
--- a/src/sage/schemes/elliptic_curves/height.py
+++ b/src/sage/schemes/elliptic_curves/height.py
@@ -1800,7 +1800,7 @@ class EllipticCurveCanonicalHeight:
This curve does have a point of good reduction whose canonical
point is approximately 1.68::
- sage: P = E.gens()[0]
+ sage: P = E.gens(lim1=5)[0]
sage: P.height()
1.68038085233673
sage: P.has_good_reduction()
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15767#comment:101>
Sage <http://www.sagemath.org>
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