> Shouldn't we be working with the fundamental coweights, not the
> fundamental weights?
>
> In this example it makes no difference since the root system is
> simply-laced.
>
> Dan
I didn't quote enough of the context in weight_lattice_realization
to show what I mean.
sage: R = RootSystem(["A",2,1]).weight_lattice()
sage: alpha = R.simple_roots()
sage: Lambda = R.fundamental_weights()
Dan
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