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There have been already two attempts to answer J. Neil's question

about possibilities of calculating in group rings of AG groups. Let me

give a third hint: Martin Wursthorn at Stuttgart (working in the group

of Prof. Klaus Roggenkamp) has a set of standalone programs written

for the investigation of modular group rings of *p-groups* (given by a

polycyclic presentation) which e.g. computes automorphism groups of

p-groups but also unit groups of such group rings. Together with

Martin Wursthorn we are planning to make this set of programs

available as a further "share library" through GAP in the not too far

future. Maybe this is of interest.

Joachim Neubueser

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