#3416: Weierstrass form for cubics
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Reporter: moretti | Owner: was
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.6.1
Component: number theory | Keywords: nagell, weierstrass, cubic,
elliptic curves, editor_wstein
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by cremona):
* status: needs_review => needs_work
Comment:
I tried to define the morphism properly, which should work, but it doesn't
since in defining the morphism Sage checks that the polynomials used a
homogeneous of the same degree (see line 458 of
schemes.generic.morphism.py), but the degree function is not defined for
elements of the coordinate ring. This can be fixed: although in general
QuotientRingElement s have no degree, in this situation (where the
quotient is by a homogeneous ideal) the degree is well-defined.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3416#comment:15>
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