Add another TODO item that I just noticed.

diff --git a/TODO b/TODO
index c9523bc23f7e2699fc6baf5965ffc9d06cef1a9d..f2caa9e71638376b14d2c642bd1827e3a442ce3f 100644 (file)
--- a/TODO
+++ b/TODO
@@ -2,3 +2,6 @@
 
 2. Add a \powerset command, once I decide whether to use \mathcal{P}
    or 2^{X} for the notation.
+
+3. Having S^{n} or H^{n} reduce to simply "S" or "H" in the case where
+   n=1 doesn't make sense.