Hello!

I'm creating a Cadabra notebook showing how the Bianchi identities are obtained, using the structural equations.

Although I achieve the goal, it is useful to show the results introducing an exterior covariant derivative, $D$. Such derivative is not nilpotent, i.e. $D^2 \neq 0$.

I tried the following

```
D{#}::Derivative.
D{#}::LaTeXForm("{\rm D}").
D{#}::DifferentialForm(degree=1);
```

but I think that the last declaration spoils the super-commutativity of the differential forms.

**Question**

How could I possible define a non-nilpotent exterior derivative?