regroup the terms as a sum of products
expression involving wedge products
This routine is part of the liesymm package and is loaded via with(liesymm).
The expression is rewritten in a sum of products form with each distinct wedge product or 1-form occurring exactly once. As the arguments to a wedge product are sorted into ``address'' order and coefficients are automatically extracted, d⁡x&ˆd⁡t is recognized as being the same as −d⁡t&ˆd⁡x.
wcollect⁡a⁢d⁡x &^ d⁡y+b⁢d⁡x &^ d⁡y
wcollect⁡a⁢d⁡x &^ d⁡y+b⁢d⁡y &^ d⁡x
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