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Liam M. Healy authored
1. Moved equal-dimension to physical-quantities.lisp. 2. Add arguments errorp and zeros-have-any-dimension. 3. Allow x or y to be a dimel and not only a pq. 4. New function dimel-or-not. 5. All three functions return a dimel if successful, or nil otherwise. 6. All three functions take a pq, dimel, or other object as input; any other object is considered dimensionless. 7. Possibly check-dimension and equal-dimension can be merged.
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