The error you get indicates that "exterior_der" is not a valid
operation. Maybe you want "exterior_derivative()"?
On Wed, 7 Feb 2024 at 13:16, Dominic Steinitz <idontgetoutm...@gmail.com> wrote:
>
> I am in the examples folder trying to run
>
> Electromagnetism in Minkowski spacetime [ipynb] (Electromagnetic field 2-form
> from E and B, Maxwell equations, conserved current, Lorentz force, Poynting
> vector)
>
>
> but I get the error
>
> AttributeError: 'DiffFormFreeModule_with_category.element_class' object has
> no attribute 'exterior_der'
> Here's a MWE
> M = Manifold(4, 'M', latex_name=r'\mathcal{M}', structure='Lorentzian')
> BL.<t,x,y,z> = M.chart(r"t x y z")
> var('E_x E_y E_z')
> dt, dx, dy, dz = BL.coframe()[:]
> E = E_x * dx + E_y * dy + E_z * dzE.set_name('E')
> (E.wedge(BL.coframe()[0])).exterior_der()
>
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