eja: update a few TODO items.

diff --git a/mjo/eja/TODO b/mjo/eja/TODO
index 76b9eaf1dcf19f3c8385bd1f0486128b005ca3f2..f49bde15a52f31f7147481cf4eada29317b091e1 100644 (file)
--- a/mjo/eja/TODO
+++ b/mjo/eja/TODO
@@ -11,6 +11,9 @@
    DirectSumEJA.
 
 6. Switch to QQ in *all* algebras for _charpoly_coefficients().
+   This only works when we know that the basis can be rationalized...
+   which is the case at least for the concrete EJAs we provide,
+   but not in general.
 
 7. Pass already_echelonized (default: False) and echelon_basis
    (default: None) into the subalgebra constructor. The value of
@@ -18,3 +21,6 @@
    some time, and usinf e.g. FreeModule_submodule_with_basis_field
    we may somehow be able to pass the echelon basis straight in to
    save time.
+
+   This may require supporting "basis" as a list of basis vectors
+   (as opposed to superalgebra elements) in the subalgebra constructor.