1. Add CartesianProductEJA.
-2. Check the axioms in the constructor when check != False?
+2. Add references and start citing them.
-3. Add references and start citing them.
+3. Implement the octonion simple EJA.
-4. Implement the octonion simple EJA.
+4. Factor out the unit-norm basis (and operator symmetry) tests once
+ all of the algebras pass.
-5. Factor out the Jordan axiom and norm tests once all of the
- algebras pass.
+5. Override inner_product(), _max_test_case_size(), et cetera in
+ DirectSumEJA.
-6. Create Element subclasses for the matrix EJAs, and then override
- their characteristic_polynomial() method to create a new algebra
- over the rationals (with a non-normalized basis). We can then
- compute the charpoly quickly by passing the natural representation
- of the given element into the new algebra and computing its charpoly
- there. (Relies on the theory to ensure that the charpolys are equal.)
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+6. Switch to QQ in *all* algebras for _charpoly_coefficients().