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+\section{Bool}\label{Bool}
+
+The BOOL library includes the following files:
+
+\begin{itemize}
+
+\item {\tt Bool.v} defines standard operations on booleans and states
+  and proves simple facts on them.
+\item {\tt IfProp.v} defines a disjunction which contains its proof
+  and states its properties.
+\item {\tt Zerob.v} defines the test against 0 on natural numbers and
+  states and proves properties of it.
+\item {\tt Orb.v} states and proves facts on the boolean or.
+\item {\tt DecBool.v} defines a conditional from a proof of
+  decidability and states its properties.
+\end{itemize}