#16743: Extend IsogenyClass_EC to work over number fields
-------------------------------------+-------------------------------------
Reporter: cremona | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: elliptic curves | Resolution:
Keywords: isogeny class | Merged in:
Authors: John Cremona | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/cremona/ticket/16743 | 06d9eb2226151a35bb2d3779e5309f4d066af8ca
Dependencies: #11327, #16764, | Stopgaps:
#16806 |
-------------------------------------+-------------------------------------
Comment (by jdemeyer):
Replying to [comment:12 jdemeyer]:
> Finally, a Python tip: you can shorten
> {{{
> t = int(I.norm() - J.norm())
> if t:
> return cmp(t,0)
>
> return cmp(I.pari_hnf().sage(), J.pari_hnf().sage())
> }}}
> to
> {{{
> return cmp(I.norm(), J.norm()) or cmp(I.pari_hnf().sage(),
J.pari_hnf().sage())
> }}}
Better yet: define a sorting ''key'' instead of a comparison function,
this is the only(!) way in Python 3 and already works now. Your key would
then be the tuple `(norm,hnf)`.
--
Ticket URL: <http://trac.sagemath.org/ticket/16743#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
