the exterior derivative
expression involving differential forms relative to specific coordinates
This routine is part of the liesymm package and is loaded via with(liesymm) .
It computes the exterior derivative of the differential form form with respect to the coordinates defined by setup() .
For coordinate x, d⁡x is a 1-form, and d⁡d⁡x=0.
Expressions not involving the coordinates are treated as constants. The coordinate list is given by wedgeset(0).
d⁡z⁢d⁡x &^ d⁡y
d⁡1⁢d⁡x &^ d⁡yc
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