-8. Implement random_instance() for general algebras as random_eja().
- Copy/paste the "general" construction into the other classes that
- can use it. The general construction can be something like "call
- random_instance() on something that inherits me and return the
- result."
-
-9. Pre-cache the one() method for concrete algebras, and test the general
- method by clearing the cache.
+7. When field=RDF, subalgebra construction is failing because the
+ inner product isn't associative? Actually, it's the combination
+ of field=RDF and orthonormalize=True.