Hi all,
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?
Cheers,
Jesus TC
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