Thanks, William. Just in time for class this morning. ;-)
Rob
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On Thu, Sep 11, 2008 at 9:16 PM, Rob Beezer <[EMAIL PROTECTED]> wrote:
>
> I'm trying to compute the "product" of a couple of subgroups (the aim
> being to build a set that is not a subgroup). My students know the
> symmetries of a tetrahedron. Following code results in errors. I can
> change t
