Try this:
http://www.gap-system.org/Packages/circle.html
-T
On Mon, 28 Jul 2014, yassine Guerboussa wrote:
> Dear colleagues,
>
> Let R be the ring of integers modulo p^n, p a prime.
> Let S be the ideal of the polynomial ring R[X], generated by X^{p+1} and
> X^p+pX.
>
> Is it possible to do the following calculation in GAP :
> 1. Compute the invariants of the additive group of the ring T= XR[X]/S.
> 2. Compute the series of ideals T^2, T^3,..., T^p.
> 3. Compute the invariants of the adjoint group of T.
>
> Thanks in advance.
>
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