#6491: [with spkg, needs review] Modular Cohomology Rings of Finite p-Groups
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Reporter: SimonKing | Owner: SimonKing
Type: enhancement | Status: assigned
Priority: major | Milestone: sage-4.1.1
Component: optional packages | Keywords: cohomology ring finite p-group
Reviewer: | Author: Simon King
Merged: |
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Comment(by wdj):
Replying to [comment:7 SimonKing]:
> Replying to [comment:5 SimonKing]:
> > > Before installing database_gap*.spkg I got an error reading
something like "cannot access database_gap" or something. Does it actually
require that spkg or merely smallgroup in gap*/pkg?
> >
> > It should be possible to do, e.g., {{{gap('SmallGroup(8,3)')}}} or
{{{gap('NumberSmallGroups(64)')}}}.
>
> Perhaps this formulation is not clear enough: The above commands
''must'' work, otherwise the cohomology package can not even start with
the computation.
>
> Cheers,
> Simon
Thanks.
In that case, I think it should be made clear in the installation docs
that to install the package you need to have run sage -i database_gap*.
I'm trying to see how this compares with GAP's CRIME package. It seems to
me that you using a completely different way of representing the
cohomology rings. Is that correct? If not, is there a simple example using
your package that can also be used with CRIME to compare their outputs?
For example, the dihedral group of order 8. It seems that CRIME wants to
truncate the ring at a given degree and you don't (but maybe I'm wrong
here?), so I don't see how to easily compare them.
BTW, I am testing the innstallation on an older amd64 ubuntu 8.10 machine.
Seems to be going okay there too.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6491#comment:8>
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