eja: update the TODO with a bug example.

[sage.d.git] / mjo / eja / TODO

diff --git a/mjo/eja/TODO b/mjo/eja/TODO
index 45a9ac06bf2c86020dee102143393e486fa408c5..1def3d2e9fd8cf381ae743344ce670a13f226438 100644 (file)
--- a/mjo/eja/TODO
+++ b/mjo/eja/TODO
@@ -1,22 +1,20 @@
 1. Add references and start citing them.
 
-2. Pre-cache charpoly for some more algebras.
+2. Profile (and fix?) any remaining slow operations.
 
-3. Profile the construction of "large" matrix algebras (like the
-   15-dimensional QuaternionHermitianAlgebra(3)) to find out why
-   they're so slow.
-
-4. What the ever-loving fuck is this shit?
-
-       sage: O = Octonions(QQ)
-       sage: e0 = O.monomial(0)
-       sage: e0*[[[[]]]]
-       [[[[]]]]*e0
-
-5. Every once in a long while, the test
+3. Every once in a long while, the test
 
        sage: set_random_seed()
        sage: x = random_eja().random_element()
        sage: x.is_invertible() == (x.det() != 0)
 
-   in eja_element.py returns False.
+   in eja_element.py returns False. Example:
+
+       sage: J1 = ComplexHermitianEJA(2)
+       sage: J2 = TrivialEJA()
+       sage: J = cartesian_product([J1,J2])
+       sage: x = J.from_vector(vector(QQ, [-1, -1/2, -1/2, -1/2]))
+       sage: x.is_invertible()
+       True
+       sage: x.det()
+       0