Hi,
> When relabelling a Cartan type:
>
> sage: A3 = CartanType("A3")
> sage: A3r = A3.relabel({1:2,2:3,3:1})
>
> one loses the cartan_matrix method, which is not implemented in
> [...]/combinat/root_system/type_relabel.py.
>
> It would be trivial to create it: just calling the cartan_matrix method of
> the CartanType parent and reordering columns and rows according to the
> relabelling.
>
> May I open a ticket in trac?
I'm forwarding this to sage-combinat-devel, where most root system related
discussions take place.
Cheers,
Florent
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