Cheers, I am currently fighting the sage install from source, it fails 
building openblas-0.3.9 (log sadly too large to attach), but was trying to 
install while in a conda environment so may try without that to fix the 
problem (otherwise all pre-reqs seemed to be fine). 

Best, Linden

On Thursday, September 24, 2020 at 2:31:35 AM UTC+1 Travis Scrimshaw wrote:

> Feel free to cc me (tscrim) on any tickets. You can also email me directly 
> if you have any questions too.
>
> Best,
> Travis
>
>
> On Tuesday, September 22, 2020 at 8:46:41 PM UTC+10, Alec Linden 
> Disney-Hogg wrote:
>
>> Hi Travis, 
>>
>> Yes I just updated to 9.1 and have found this problem fixed, thanks. 
>>
>> I'd love to contribute to sage, and indeed have ideas for Verma modules 
>> that I'd like to see if it's possible to get to work. I've not contributed 
>> to an open source project like this before, so I imagine I'll need to take 
>> it step by step.
>>
>> Best, 
>>
>> Linden
>> On 22/09/2020 00:22, 'Travis Scrimshaw' via sage-devel wrote:
>>
> Hi Linden,
>>    This works for me in 9.1. So this was either fixed in a later version 
>> or possibly wasn't considered supported in version 8.9 (although probably 
>> the former). So I would recommend upgrading to the latest version of Sage.
>>
>> Side note: if you would like to contribute to Sage, the (semi)simple Lie 
>> algebras should probably just return themselves as the derived subalgebra.
>>
>> Best,
>> Travis
>>
>>
>> On Tuesday, September 22, 2020 at 7:36:58 AM UTC+10, Linden Disney wrote: 
>>>
>>> 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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