-5. Compute the scalar in the general natural_inner_product() for
- matrices, so no overrides are necessary. Actually, this is
- probably better implemented as a dimension_over_reals() method
- that returns 1, 2, or 4.
-
-6. The main EJA element constructor is happy to convert between
- e.g. HadamardEJA(3) and JordanSpinEJA(3).
+4. When we take a Cartesian product involving a trivial algebra, we
+ could easily cache the identity and charpoly coefficients using
+ the nontrivial factor. On the other hand, it's nice that we can
+ test out some alternate code paths...