--- a/text/comm_alg.tex	Tue Aug 03 21:45:10 2010 -0600
+++ b/text/comm_alg.tex	Wed Aug 18 21:05:50 2010 -0700
@@ -1,6 +1,6 @@
 %!TEX root = ../blob1.tex
 
-\section{Commutative algebras as $n$-categories}
+\section{Commutative algebras as \texorpdfstring{$n$}{n}-categories}
 \label{sec:comm_alg}
 
 If $C$ is a commutative algebra it