--- a/preamble.tex	Sun Nov 01 20:29:33 2009 +0000
+++ b/preamble.tex	Sun Nov 01 20:29:41 2009 +0000
@@ -51,6 +51,7 @@
 \newcommand{\doi}[1]{\href{http://dx.doi.org/#1}{{\tt DOI:#1}}}
 \newcommand{\euclid}[1]{\href{http://projecteuclid.org/euclid.cmp/#1}{{\tt at Project Euclid: #1}}}
 \newcommand{\mathscinet}[1]{\href{http://www.ams.org/mathscinet-getitem?mr=#1}{\tt #1}}
+\newcommand{\googlebooks}[1]{(preview at \href{http://books.google.com/books?id=#1}{google books})}
 
 
 % THEOREMS -------------------------------------------------------
@@ -179,6 +180,7 @@
 
 \newcommand{\CM}[2]{C_*(\Maps(#1 \to #2))}
 \newcommand{\CD}[1]{C_*(\Diff(#1))}
+\newcommand{\CH}[1]{C_*(\Homeo(#1))}
 
 \newcommand{\directSumStack}[2]{{\begin{matrix}#1 \\ \DirectSum \\#2\end{matrix}}}
 \newcommand{\directSumStackThree}[3]{{\begin{matrix}#1 \\ \DirectSum \\#2 \\ \DirectSum \\#3\end{matrix}}}