-4. Implement the octonion simple EJA.
-
-5. Factor out the unit-norm basis (and operator symmetry) tests once
- all of the algebras pass.
-
-6. Override inner_product(), _max_test_case_size(), et cetera in
- DirectSumEJA.
-
-7. Switch to QQ in *all* algebras for _charpoly_coefficients().
+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.