[GAP Forum] work with the additive group of a ring or field

[Philipp Schneider]

Dear GAP forum,

how can I work with the additive group of a field or a ring?

For example, how can I find out if the additive group of GF(4) is cyclic or not?
Or, let Z be the additive group of the integers. How do I compute the index of the intersection of 2*Z and 3*Z in Z, with a command similar to Index(Integers,Intersection(2*Integers,3*Integers)); ?

thanks,
Philipp
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