diff -r c43f9f8fb395 -r 75c1e11d0f25 text/intro.tex
--- a/text/intro.tex	Fri Oct 14 08:35:15 2011 -0700
+++ b/text/intro.tex	Sat Oct 22 13:26:53 2011 -0600
@@ -496,7 +496,7 @@
 Much more could be said about other types of manifolds, in particular oriented, 
 $\operatorname{Spin}$ and $\operatorname{Pin}^{\pm}$ manifolds, where boundary issues become more complicated.
 (We'd recommend thinking about boundaries as germs, rather than just codimension $1$ manifolds.) 
-We've also take the path of least resistance by considering $\operatorname{PL}$ manifolds; 
+We've also take the path of least resistance by concentrating on PL manifolds; 
 there may be some differences for topological manifolds and smooth manifolds.
 
 The paper ``Skein homology'' \cite{MR1624157} has similar motivations, and it may be