-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. The EJA random element method only returns two summands by default.
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+6. Override inner_product(), _max_test_case_size(), et cetera in
+ DirectSumEJA.
+
+7. Switch to QQ in *all* algebras for _charpoly_coefficients().