Re: [sage-support] Re: Sagemanifolds: object has no attribute 'exterior_der'

[Eric Gourgoulhon]

Le jeudi 8 février 2024 à 13:45:18 UTC+1, Dominic Steinitz a écrit :

Sorry about posting the same thing twice.


No problem.
Just for reference, in case someone reads this thread: the answer about the 
connection forms is here:
https://ask.sagemath.org/question/75256/connection-forms-not-anti-symmetric/

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Re: [sage-support] Re: Sagemanifolds: object has no attribute 'exterior_der'

[Dominic Steinitz]

Sorry about posting the same thing twice.

On Wednesday 7 February 2024 at 19:26:32 UTC G. M.-S. wrote:

>
> Just to say that
> https://ask.sagemath.org
> gives me
> 502 Bad Gateway
>
> Guillermo
>
> On Wed, 7 Feb 2024 at 19:35, Eric Gourgoulhon  wrote:
>
>> Le mercredi 7 février 2024 à 15:46:05 UTC+1, Dominic Steinitz a écrit :
>>
>> The example here https://sagemanifolds.obspm.fr/examples.html of 
>>
>>
>>- Electromagnetism in Minkowski spacetime 
>>
>> 
>> [ipynb 
>>
>> ]
>>  
>>(Electromagnetic field 2-form from E and B, Maxwell equations, conserved 
>>current, Lorentz force, Poynting vector)
>>
>> Fails with the error in the title and in more detail below. 
>>
>>
>> For reference: this is discussed in the new thread 
>> https://groups.google.com/g/sage-support/c/yD6k655EWOA/m/3AMzKdpaAQAJ
>>
>> Besides, the question about the connection forms has been answered on   
>> https://ask.sagemath.org/
>>
>> Eric.
>>
>
>

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Re: [sage-support] Re: Sagemanifolds: object has no attribute 'exterior_der'

[G. M.-S.]

Just to say that
https://ask.sagemath.org
gives me
502 Bad Gateway

Guillermo

On Wed, 7 Feb 2024 at 19:35, Eric Gourgoulhon 
wrote:

> Le mercredi 7 février 2024 à 15:46:05 UTC+1, Dominic Steinitz a écrit :
>
> The example here https://sagemanifolds.obspm.fr/examples.html of
>
>
>- Electromagnetism in Minkowski spacetime
>
> 
> [ipynb
>
> ]
>(Electromagnetic field 2-form from E and B, Maxwell equations, conserved
>current, Lorentz force, Poynting vector)
>
> Fails with the error in the title and in more detail below.
>
>
> For reference: this is discussed in the new thread
> https://groups.google.com/g/sage-support/c/yD6k655EWOA/m/3AMzKdpaAQAJ
>
> Besides, the question about the connection forms has been answered on
> https://ask.sagemath.org/
>
> Eric.
>

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