Prof. Dr. Johannes Grabmeier wrote:
> 
> Thanks,
> at least that is a work around for me at the moment to complete my
> coding, as C4 and D4  is most important for this application.
> 

I have now commited a fix, so that your original case works.
However, note that the problem was due to hardcoding number 4
in the domain.  If I modify the domain to take group as
parameter or pass order of the group as parameter, then it
works without need for the fix.  That is either:

)abbrev domain CYC2DV CyclicTwoDimensionalVelocity
CyclicTwoDimensionalVelocity(R: Field, n : PositiveInteger, 
                             d: Symbol): Exports == Implementation where
  G   ==> CyclicGroup(n, d)
  Exports ==> MonoidAction(G) with
  ....

or

)abbrev domain CYC2DV CyclicTwoDimensionalVelocity
CyclicTwoDimensionalVelocity(R: Field, G : Join(Group, FinitelyGenerated)
                            ) : Exports == Implementation where
  Exports ==> MonoidAction(G) with
  ....

works.

-- 
                              Waldek Hebisch

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