On the doc page for Lie subalgebras (
https://doc.sagemath.org/html/en/reference/algebras/sage/algebras/lie_algebras/subalgebra.html)
there is an example getting a subalgebra of sl3:
sl3 = LieAlgebra(QQ, cartan_type=['A',2])
D = sl3.derived_subalgebra()
This throws the error
TypeError: unsupported operand parent(s) for <: 'Coroot lattice of the Root
system of type ['A', 2]' and 'Root lattice of the Root system of type ['A',
2]'
The error persists when calculating general subalgebras (e.g. trying
sl3.subalgebra(list(sl3.e())) ) and seems to be related to the classical
Lie algebra, as I can get subalgebras working fine with, for example, the
Heisenberg algebra (see first example on the doc page).
I am running SageMath version 8.9, Release Date: 2019-09-29 with system
details:
Operating System: Ubuntu 18.04.4 LTS
Kernel: Linux 5.4.0-42-generic
Architecture: x86-64
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