+
+5. Factor out the unit-norm basis (and operator symmetry) tests once
+ all of the algebras pass.
+
+6. Can we make the minimal and characteristic polynomial tests work
+ for trivial algebras, too? Then we wouldn't need the "nontrivial"
+ argument to random_eja().
+
+7. Solve the charpoly system with A_of_x.solve_right(x_powers[r])
+ rather than dumbass Cramer's rule.