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 \newpage
 \section{Introduction}
 
+\subsection{Overview}
+
 These notes accompany the book Surreal Numbers by Donald Knuth, specifically
 the 1974 edition. They are only intended to further my own understanding; no
 guarantees of accuracy, relevance, or significance are extended.
 
-\section{Notation}
+\subsection{Notation}
 
 A surreal number $X$ consisting of left set $X_L$ and right set $X_R$ is
 represented as \surreal{X_L}{X_R}. The void set, as Knuth named it, is