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I am a student of mathematics who has difficulties with GAP 4. I unfortunately don't know how to do the following things:

1) I wish to compute the Heller module of the trivial module in the Kleinian Four Group

2) I'd like to enter a module in GAP when some matrices which reflect the group elements' actions are given (e.g. like in exercise 13 on page 24 (31 of 109) of Benson's paper http://arxiv.org/PS_cache/arxiv/pdf/1107/1107.4815v1.pdf)

3) I want to calculate with an algebraic closure of F_p in GAP - is there a way to implement this?

I would be very grateful for any help.

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    @Arturo: Thank you for your comment. I think, I'll do that if I don't get answers here.2012-01-04

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Do you mean the first Heller translate of the trivial module? If so, it is relatively easy to describe, and is the unique maximal submodule of the regular module for the Klein 4-group: in other words, the augmentation ideal. It does not really require GAP to find all you need to know about the group action on this module.

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    @Lisa123: Note$d$. I am not rea$l$ly the person to answer such questions.2012-01-04