#4061: [with patch, needs review] coercion from torsion subgroup of elliptic
curve
to elliptic curve is broken
---------------------------+------------------------------------------------
Reporter: was | Owner: was
Type: defect | Status: new
Priority: minor | Milestone: sage-3.2.2
Component: number theory | Resolution:
Keywords: |
---------------------------+------------------------------------------------
Changes (by cremona):
* summary: coercion from torsion subgroup of elliptic curve to elliptic
curve is broken => [with patch, needs review]
coercion from torsion subgroup of elliptic
curve to elliptic curve is broken
Comment:
The patch fixes this, based on 3.2.1.rc0. All doctests in elliptic_curves
pass, and both files touched still have 100% coverage :).
The behaviour for trivial torsion groups is not ideal, but is due to a bug
in the Abelian Group class which causes the list of elements of a trivial
abelian group to be empty. That should be in a separate ticket, but it
would of course be best solved by the total rewrite of Abelian Groups
which we have all wanted (and some of us have partially implemented) for
many months...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4061#comment:3>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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