\section{Second-Order Homogeneous}
\label{ch:second_order_homogeneous}

\subsection{Characteristic Equation}
\label{sec:ch04_characteristic_equation}

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\subsection{Three Root Cases}
\label{sec:ch04_three_root_cases}

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\subsection{Superposition Principle}
\label{sec:ch04_superposition}

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\subsection{Wronskian and Linear Independence}
\label{sec:ch04_wronskian}

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\subsection{Abel's Identity}
\label{sec:ch04_abels_identity}

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\subsection{Reduction of Order}
\label{sec:ch04_reduction_of_order}

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\subsection{Summary}
\label{sec:ch04_summary}

% Summary table at end of chapter
\begin{table}[htbp]
\centering
\caption{Chapter Summary}
\label{tab:ch04_summary}
\begin{tabular}{l l}
\toprule
\textbf{Concept} & \textbf{Key Formula/Method} \\
\midrule
TBD & TBD \\
\bottomrule
\end{tabular}
\end{table}