#11982: Morphisms from elliptic curves to projective curves are not possible
anymore
-----------------------------------+------------------------
Reporter: mderickx | Owner: cremona
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: elliptic curves | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
-----------------------------------+------------------------
Changes (by chapoton):
* milestone: => sage-6.9
Old description:
> The following used to work in sage 4.4.4
>
> {{{
> P2.<x,y,z> = ProjectiveSpace(QQ,2)
> d=7
> C=Curve(x^3 + y^3 - d*z^3)
> E=EllipticCurve([0,-432*d^2])
> transformation=[(36*d*z-y)/(72*d),(36*d*z+y)/(72*d),x/(12*d)]
> phi = E.hom(transformation,C) #this used to work
> }}}
> {{{
> Traceback (click to the left of this block for traceback)
> ...
> AttributeError: 'SchemeHomset_generic_with_category' object has no
> attribute 'point_homset'
> }}}
> For better description of the context:
> https://sage.math.leidenuniv.nl/home/pub/7/
New description:
The following used to work in sage 4.4.4
{{{
P2.<x,y,z> = ProjectiveSpace(QQ,2)
d=7
C=Curve(x^3 + y^3 - d*z^3)
E=EllipticCurve([0,-432*d^2])
transformation=[(36*d*z-y)/(72*d),(36*d*z+y)/(72*d),x/(12*d)]
phi = E.hom(transformation,C) #this used to work
}}}
{{{
Traceback (click to the left of this block for traceback)
...
AttributeError: 'SchemeHomset_generic_with_category' object has no
attribute 'point_homset'
}}}
For better description of the context:
https://sage.math.leidenuniv.nl/home/pub/7/
--
--
Ticket URL: <http://trac.sagemath.org/ticket/11982#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
