\newcommand{\patch}{{\mathcal P}}
\newcommand{\base}{{\mathcal B}}
+\newcommand{\depsreq}{{\mathcal D}}
\newcommand{\patchof}[1]{\patch ( #1 ) }
\newcommand{\baseof}[1]{\base ( #1 ) }
+\newcommand{\depsreqof}[1]{\depsreq ( #1 ) }
\newcommand{\eqntag}[2]{ #2 \tag*{\mbox{#1}} }
\newcommand{\eqn}[2]{ #2 \tag*{\mbox{\bf #1}} }
\begin{document}
+\chapter{Data model}
+
\input{notation.tex}
\input{invariants.tex}
\input{lemmas.tex}
\input{anticommit.tex}
\input{merge.tex}
+\chapter{Merge strategy}
+
+\input{strategy.tex}
+
\end{document}