compute the wedge degree of a form
This routine is part of the liesymm package and is loaded via with(liesymm) .
It returns the wedge degree of a differential form.
It is defined relative to a given coordinate system, so use of setup() may change its value.
As the list of coordinates fully defines the one-forms, the value of this routine is just the number of terms in the basic wedge product (that is, nops⁡getform⁡expr).
a ≔ x2⁢d⁡x &^ d⁡y &^ d⁡z
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