--- a/pnas/preamble.tex	Sun Oct 24 22:48:18 2010 -0700
+++ b/pnas/preamble.tex	Mon Oct 25 13:08:15 2010 -0700
@@ -9,7 +9,7 @@
 
 \newcommand{\CM}[2]{C_*(\Maps(#1 \to #2))}
 \newcommand{\CD}[1]{C_*(\Diff(#1))}
-\newcommand{\CH}[1]{C_*(\Homeo(#1))}
+\newcommand{\CH}[1]{CH_*(#1)}
 
 \newcommand{\cl}[1]{\underrightarrow{#1}}
 
@@ -37,7 +37,7 @@
 \newcommand{\tensor}{\otimes}
 \newcommand{\Tensor}{\bigotimes}
 
-\newcommand{\selfarrow}{\ensuremath{\smash{\tikz[baseline]{\draw[->] (0,0.2) .. controls (0.6,0.8) and (0.6,-0.6) .. (0,0);}}}}
+\newcommand{\selfarrow}{\ensuremath{\smash{\tikz[baseline]{\clip (0,0.36) rectangle (0.48,-0.16); \draw[->] (0,0.2) .. controls (0.6,0.8) and (0.6,-0.6) .. (0,0);}}}}
 
 \newcommand{\bdy}{\partial}
 \newcommand{\compose}{\circ}
@@ -46,6 +46,9 @@
 \newcommand{\id}{\boldsymbol{1}}
 
 \newtheorem{property}{Property}
+\newtheorem{prop}{Proposition}
+\newtheorem{thm}[prop]{Theorem}
+
 \newenvironment{rem}{\noindent\textsl{Remark.}}{}
 
 % \mathrlap -- a horizontal \smash--------------------------------
@@ -63,6 +66,16 @@
 \def\mathclapinternal#1#2{%
 \clap{$\mathsurround=0pt#1{#2}$}}
 
+% references
+
+\newcommand{\arxiv}[1]{\href{http://arxiv.org/abs/#1}{\tt arXiv:\nolinkurl{#1}}}
+\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})}
+
+
+
 % packages
 
 \usepackage{tikz}
@@ -73,3 +86,16 @@
 
 \usepackage[all,color]{xy}
 \SelectTips{cm}{}
+
+\usepackage[pdftex,plainpages=false,hypertexnames=false,pdfpagelabels]{hyperref}
+
+\usepackage{xcolor}
+\definecolor{dark-red}{rgb}{0.7,0.25,0.25}
+\definecolor{dark-blue}{rgb}{0.15,0.15,0.55}
+\definecolor{medium-blue}{rgb}{0,0,0.65}
+
+\hypersetup{
+    colorlinks, linkcolor={dark-red},
+    citecolor={dark-blue}, urlcolor={medium-blue}
+}
+