--- a/pnas/preamble.tex	Sun Nov 14 16:00:35 2010 -0800
+++ b/pnas/preamble.tex	Sun Nov 14 16:02:06 2010 -0800
@@ -36,6 +36,7 @@
 
 \newcommand{\directSum}{\oplus}
 \newcommand{\DirectSum}{\bigoplus}
+\newcommand{\ot}{\otimes}
 \newcommand{\tensor}{\otimes}
 \newcommand{\Tensor}{\bigotimes}