Thanks Marek,
Things work now. It looks like your method of checking whether a
vector is in a subspace is better than what I was using.
> bb:=MutableBasis(F, V); # MM
> M:=List(vD4,x->List(V,y->IsContainedInSpan(bb,x*y))); #MM
It would be good to have what I was using also works (in principle
there's no reason for it to fail) since that gives a matrix for the action;
maybe it's a simple fix in GAP.
Regards,
R.N.
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