On May 6, 7.10pm, William Stein wrote:
>Crap.   Thanks for spotting this.  Fortunately this is used in only
> one place in Sage; this one line in congroup_gamma0.py:
>
>       return [GammaH(N, H) for H in R.multiplicative_subgroups()]

Yes, that was how I noticed this -- my fix for 5250 caused
multiplicative_subgroups to give a different answer when n = 2, which
broke the doctest for that function in congroup_gamma0.

On May 6, 7:13 pm, John Cremona <john.crem...@gmail.com> wrote:
> Do we have a function which returns (Z/NZ)* as an abelian group?

Somehow secretly we do, because it's embedded in the DirichletGroup
machinery; but nothing that explicitly creates an AbelianGroup object.


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