mjo/eja/TODO

   1 1. Add references and start citing them.
   2
   3 2. Profile (and fix?) any remaining slow operations.
   4
   5 3. When we take a Cartesian product involving a trivial algebra, we
   6    could easily cache the identity and charpoly coefficients using
   7    the nontrivial factor. On the other hand, it's nice that we can
   8    test out some alternate code paths...
   9
  10 4. Can we hit "x" with the deortho matrix and delegate to the
  11    _rational_algebra to speed up minimal_polynomial?
  12
  13 5. In CartesianProductEJA we already know the multiplication table and
  14    inner product matrix. Refactor things until it's no longer
  15    necessary to duplicate that work.
  16
  17 6. Eliminate the matrix_space() override in CartesianProductEJA.