#4061: [with new patch, positive 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 robertwb):
* summary: [with new patch, needs review] coercion from torsion subgroup
of elliptic curve to elliptic curve is broken
=> [with new patch, positive review] coercion
from torsion subgroup of elliptic curve to
elliptic curve is broken
Comment:
Looks good. Thanks for fixing this (including that very annoying bug in
trivial abelian groups). I still find it annoying that it returns a
multiplicative abelian group (rather than an additive one) but as is
mentioned, that's a later ticket/project.
This is a bit odd
{{{
sage: E = EllipticCurve('11a')
sage: T = E.torsion_subgroup()
sage: T.gen(0) in T
False
}}}
but I suppose that's how it used to be, not part of this ticket.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4061#comment:5>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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