-4. Conjecture: if x = (x1,x2), then det(x) = det(x1)det(x2). This
- should be used to fix the fact that det(x) is monstrously slow in
- Cartesian product algebras, and thus randomly in the doctests.
+4. Add dimension bounds on any tests over AA that compute element
+ subalgebras.
+
+5. The rational_algebra() stuff doesn't really belong in classes that
+ don't derive from RationalBasisEJA or its as-yet-nonexistent
+ element class.
+
+6. Add special det/trace method overrides for the algebras where we
+ know them? The only reason this might be tricky is because the
+ obvious solution is to subclass EJAElement, but then we might
+ collide with e.g. the Cartesian product element subclass.