\documentclass[twoside]{book}

%\includeonly{week1,week2,week12,week13,week33,week34}
%\tracingstats=2

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\usepackage[all,knot]{xy}
\usepackage{amssymb}

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\newtheorem{exercise}{Exercise}
\newtheorem{theorem}{Theorem}
\newtheorem{definition}{Definition}
\newtheorem{corollary}{Corollary}

\title{Quantum Gravity}
\author{John C. Baez \and Miguel Carri\'on \'Alvarez}

\begin{document}

\maketitle

\part{Spin networks/Field theory}
\include{week1}
\include{week2}
\include{week3}
\include{week4}
\include{week5}
\include{week6}
\include{week7}
\include{week8}
\part{Quantum gravity/Category Theory}
\include{week9}
\include{week10}
\include{week11}
\include{week12}
\include{week13}
\part{Spin foam models of 3D QG}
\part{Miscellaneous}
\include{week31}
\include{week32}
\include{week33}
\include{week34}
\end{document}





