-A. Make the subalgebra class work with any subalgebra (there's nothing
- special except a_regular_element() in there).
+0. Add tests for orthogonality in the Peirce decomposition.
1. Add CartesianProductEJA.
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().
+6. The EJA random element method only returns two summands by default.
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