Damn it, I feel so stupid! :D Thanks, this did the job. :)
Am 15.05.2019 um 14:48 schrieb Travis Scrimshaw:
However, the interesting part for me is the commutative subalgebra
of even mixed forms which I could certainly implement. But I am
not sure whether this will work due to the error message above...
The error message indicates what you need to do: implement an
is_field() method that returns False.
Best,
Travis
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