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Dear Dima, dear Gap-Forum,

I am just writing to mention that I am currently working on GAP programs

which are intended to become an IntegralMeatAxe package later on.

I have got the basic arithmetique such as finding bases of sublattices,

finding smallest pure overlattices, finding nullspaces, finding the action

on sublattices and quotient lattices, and finding submodules generated by

sets of vectors. They are based on the ideas described in R.Parker's paper

mentioned by Steve.

But a good irreducibility test, in particular for the cases where the

endomorphism ring of an irreducible module is a proper skew field, and

an automatic chop program, where in particular the question of

entry explosion has to be addressed, are still under construction.

Hence for the time being the programs are in a state which does not allow

to make them publicly available. But I am very interested in trying my luck

on test examples which differ from the ones I usually encounter. Would it

help you, Dima, if you sent me a few of the examples you are working on?

Best wishes, J"urgen M"uller. -- J"urgen M"uller, Lehrstuhl D f"ur Mathematik, RWTH Aachen Templergraben 64, D-52062 Aachen, Zimmer 231 Telefon: +49-214-80-94547, Fax: +49-214-80-92108

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