+0. Add tests for orthogonality in the Peirce decomposition.
+
1. Add CartesianProductEJA.
2. Check the axioms in the constructor when check != False?
5. Factor out the unit-norm basis (and operator symmetry) tests once
all of the algebras pass.
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-6. Add a TrivialEJA class and use it in the tests for is_trivial().
- The random_eja() function should also be able to return these.