The given example was not right at all. this one works:
R = C[x1,x2,x3]
I = C[x1x2x3,x1^3,x2^3,x3^3]
this leads to G given as above:
> let G \subset SL_3(CC) act by a e_i -> a x_i. If xi is a third primitive
> root of unity, then G must be generated by
> diagonalmatrix(xi,xi,xi).


greatz Johannes

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