\documentclass[12pt, a4paper]{article}
\usepackage{amsmath}
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\theoremstyle{plain}
\newtheorem{thm}{Theorem.}
\begin{document}
\title{Random Geometric Graphs: Lecture Notes}
\author{Speaker: Milan Brandonjic}
\maketitle
\input part1.tex
\input part2.tex
\input part3.tex
\input part4.tex
\end{document}
