eja: add a performance TODO for Cartesian products with trivial factors.

diff --git a/mjo/eja/TODO b/mjo/eja/TODO
index 1def3d2e9fd8cf381ae743344ce670a13f226438..529f70fd633bf36275c63282a05614f1109a7df0 100644 (file)
--- a/mjo/eja/TODO
+++ b/mjo/eja/TODO
@@ -18,3 +18,8 @@
        True
        sage: x.det()
        0
+
+4. When we take a Cartesian product involving a trivial algebra, we
+   could easily cache the identity and charpoly coefficients using
+   the nontrivial factor. On the other hand, it's nice that we can
+   test out some alternate code paths...