skeleton: 14 chapter stubs and 4 appendices

chapters/ch04_second_order_homogeneous.tex

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+\section{Second-Order Homogeneous}
+\label{ch:second_order_homogeneous}
+
+\subsection{Characteristic Equation}
+\label{sec:ch04_characteristic_equation}
+
+% Content goes here
+
+\subsection{Three Root Cases}
+\label{sec:ch04_three_root_cases}
+
+% Content goes here
+
+\subsection{Superposition Principle}
+\label{sec:ch04_superposition}
+
+% Content goes here
+
+\subsection{Wronskian and Linear Independence}
+\label{sec:ch04_wronskian}
+
+% Content goes here
+
+\subsection{Abel's Identity}
+\label{sec:ch04_abels_identity}
+
+% Content goes here
+
+\subsection{Reduction of Order}
+\label{sec:ch04_reduction_of_order}
+
+% Content goes here
+
+\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}