--- 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