\section{Denstiy functional theory}
\label{section:dft}
+\subsection{Hohenberg-Kohn theorem}
+
\subsection{Born-Oppenheimer (adiabatic) approximation}
-\subsection{Hohenberg-Kohn theorem}
+\subsection{Effective potential}
-\subsection{Exchange correlation}
+\subsection{Kohn-Sham system}
+
+\subsection{Approximations for exchange and correlation}
\subsection{Pseudopotentials}
+\section{Modeling of defects}
+\label{section:basics:defects}
+
+\section{Migration paths and diffusion barriers}
+\label{section:basics:migration}
+