#3416: Weierstrass form and Jacobian for cubics and certain other genus-one
curves
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Reporter: moretti |
Owner: was
Type: enhancement |
Status: needs_review
Priority: major |
Milestone: sage-5.11
Component: elliptic curves |
Resolution:
Keywords: nagell, weierstrass, cubic, elliptic curves, editor_wstein |
Work issues:
Report Upstream: N/A |
Reviewers: John Cremona, Marco Streng, Nils Bruin
Authors: Niels Duif, Volker Braun |
Merged in:
Dependencies: #12553, #13084, #13458 |
Stopgaps:
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Comment (by cremona):
I get doctest failures in jacobian.py. Al else in the elliptic_curves
directory pass.
Secondly, in are_projectively_equivalent(P, Q) the function and exit with
True as soon as the condition ratio[0]*p == ratio[1]*q holds, so those two
lines should be replaced by
{{{
else return ratio[0]*p == ratio[1]*q:
}}}
but I don't know why the function does not just
{{{
return Matrix([P,Q]).rank() < 2
}}}
?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3416#comment:72>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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