Re: [sage-support] Sagemanifolds error in example notebook

I volunteer On Wednesday 7 February 2024 at 18:30:22 UTC Eric Gourgoulhon wrote: > Le mercredi 7 février 2024 à 16:00:07 UTC+1, Eric Gourgoulhon a écrit : > > Indeed, this notebook is 8 years old and is not at all up to date (there > is even Python 2 print commands in it!). > Please open an issu

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

e 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 >> >> <https://nbviewer.jupyter.org/githu

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

The example here https://sagemanifolds.obspm.fr/examples.html of > Electromagnetism in Minkowski spacetime > > [ipynb > ] > (Electr

Re: [sage-support] Sagemanifolds error in example notebook

hat "exterior_der" is not a valid > operation. Maybe you want "exterior_derivative()"? > > On Wed, 7 Feb 2024 at 13:16, Dominic Steinitz > wrote: > > > > I am in the examples folder trying to run > > > > Electromagnetism in Minkowski spacetime [ip

[sage-support] Sagemanifolds error in example notebook

I am in the examples folder trying to run - Electromagnetism in Minkowski spacetime [ipynb ] (Electromagnetic f

[sage-support] Re: Connection Forms not Anti-Symmetric

, nabla_g connection 1-form (0,1) = y e^0 - x e^1) In [14]: omega(1,0,e).display(e), omega(1,1,e).display(e) Out [14]: (nabla_g connection 1-form (1,0) = -y e^0 + x e^1, nabla_g connection 1-form (1,1) = 0) On Tuesday 2 January 2024 at 17:28:43 UTC Dominic Steinitz wrote: > Well apparentl

[sage-support] Re: Connection Forms not Anti-Symmetric

. On Monday 1 January 2024 at 17:43:12 UTC Dominic Steinitz wrote: > That should be > > `omega(1,1).display(e)` > > > nabla_g connection 1-form (1,1) = x e^0 + y e^1) > > On Sunday 31 December 2023 at 16:43:16 UTC Dominic Steinitz wrote: > >> I am calculating the co

[sage-support] Re: Connection Forms not Anti-Symmetric

That should be `omega(1,1).display(e)` > nabla_g connection 1-form (1,1) = x e^0 + y e^1) On Sunday 31 December 2023 at 16:43:16 UTC Dominic Steinitz wrote: > I am calculating the connection forms for the case of a Poincaré Disk but > the diagonal elements appear to be non-ze

[sage-support] Connection Forms not Anti-Symmetric

I am calculating the connection forms for the case of a Poincaré Disk but the diagonal elements appear to be non-zero `M = Manifold(2, 'M', r'\mathcal{M}')` `c_xy. = M.chart('x:(-1,1) y:(-1,1)', coord_restrictions=lambda x,y: x^2+y^2<1)` `g = M.riemannian_metric('g')` `g[0,0], g[1,1] = 4/(1 -