+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.
-6. Refactor the current ungodly fast charpoly hack (relies on the
- theory to ensure that the charpolys are equal.)
+6. The EJA random element method only returns two summands by default.
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