the nontrivial factor. On the other hand, it's nice that we can
test out some alternate code paths...
-4. Conjecture: if x = (x1,x2), then det(x) = det(x1)det(x2).
+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.