#6384: [with patch, needs review] elliptic curve -- isogeny function is not
robust
-- it doesn't check validity of its input
-----------------------------+----------------------------------------------
Reporter: was | Owner: shumow
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.2
Component: elliptic curves | Keywords: elliptic curves, isogeny,
Reviewer: | Author:
Merged: |
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Changes (by wuthrich):
* cc: cremona (added)
Comment:
I am updating here the patch. It is now based on sage-4.1.1 plus trac
ticket #6672 .
Since nothing seems to happen with this patch and I continue to insist
that it should go in as it is, I allow myself to switch back to 'needs
review'. If any reviewer is against it for the reasons mentioned eralier,
then I would propose that this ticket goes in (as it fixes some serious
bugs) and that the changes are made later to it. I recall the main changes
:
* one can now give a single point or a list of points as the kernel
argument. The isogeny has kernel generated by these points.
* it checks now if the points are torsion points and, when a polynomial
is given, that it divides the correct division polynomial.
* and it changes the documentation slightly.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6384#comment:11>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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