[sage-support] Re: Cotton Tensor gives wrong result.

[Eric Gourgoulhon]

Hi, 

What do you mean exactly by "Cotton tensor gives wrong result" ?
Maybe this is matter of convention... SageMath's definition of the Cotton 
conformal tensor is here:
https://doc.sagemath.org/html/en/reference/manifolds/sage/manifolds/differentiable/metric.html#sage.manifolds.differentiable.metric.PseudoRiemannianMetric.cotton

Best wishes,

Eric. 

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[sage-support] Re: Multiprocessing for Tensors is not working for Macintosh. (SageMath 9.0)

[Eric Gourgoulhon]

Hi, 

Le dimanche 24 mai 2020 15:15:14 UTC+2, Alan Stafford a écrit :
>
> Multiprocessing of Tensors is not working for Macintosh.
>
>
Alas, this is a known issue that has been reported repeatedly by macOS 
users: Sage's multiprocessing seems broken on macOS. No fix has been 
proposed yet.
What is strange is that the doctests involving multiprocessing are passed 
on macOS. So there is something in the doctest framework that makes it 
work. But in an interactive session, it fails, as you noticed. I am not 
familiar at all with macOS and cannot help on this point. Sorry...

Eric.

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