Thanks for all the replies. There is now a palindromic ticket for this at
#13431.
John
On Wednesday, September 5, 2012 8:24:45 AM UTC+1, Nicolas M. Thiéry wrote:
>
> Hi Rob!
>
> (CC to sage-combinat; this is thread [1] on sage-devel)
>
> On Tue, Sep 04, 2012 at 07:36:51AM -0700, Rob Beezer wrote:
> > On Tuesday, September 4, 2012 6:21:11 AM UTC-7, John Cremona wrote:
> >
> > If pi is a permutation, e.g. defined by pi=permutations(4)[3], then
> > pi.signature() returns what I have always called the "sign" of pi,
> and
> > none of pi.sign(), pi.sgn(), sign(pi), sgn(pi) work.
> >
> > But:
> >
> > sage: G = SymmetricGroup(2)
> > sage: a = G("(1,2)")
> > sage: a.sign()
> > -1
> >
> > So I'd say +1 to greater coordination between group element
> permutations
> > and purely combinatorial permutations overall, and in particular
> having
> > .sign() as John suggests for the "other" permutations.
>
> +1! This miscoordination has been an itch for us for quite a while.
> In general, Permutations need some heavy refactoring which will be
> best done all at once; but a simple change like this can be done right
> away.
>
> Cheers,
> Nicolas
>
> PS:
> https://groups.google.com/forum/?hl=fr&fromgroups=#!topic/sage-devel/DYVbTWWOMtE)
>
>
> --
> Nicolas M. Thi�ry "Isil" <nth...@users.sf.net <javascript:>>
> http://Nicolas.Thiery.name/
>
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