--- a/preamble.tex	Fri Jul 23 08:14:27 2010 -0600
+++ b/preamble.tex	Fri Jul 23 13:52:30 2010 -0700
@@ -111,6 +111,8 @@
 \newcommand{\HC}{\operatorname{Hoch}}
 \newcommand{\HH}{\operatorname{HH}}
 
+\newcommand{\cell}{\mathfrak{D}}
+
 \newcommand{\selfarrow}{\ensuremath{\!\!\!\!\!\!\xymatrix{ \ar@(ru,rd)@<-1ex>[]}\phantom{++.\!\!}}}
 \newsavebox{\selfarrowcontents}
 \savebox{\selfarrowcontents}{\selfarrow}