--- a/doc-src/Logics/preface.tex Tue May 04 18:04:45 1999 +0200
+++ b/doc-src/Logics/preface.tex Tue May 04 18:05:34 1999 +0200
@@ -5,10 +5,21 @@
starting points for defining new logics. Each logic is distributed with
sample proofs, some of which are described in this document.
-The logics \texttt{FOL} (first-order logic) and \texttt{ZF} (axiomatic set
-theory) are described in a separate manual~\cite{isabelle-ZF}. Here are the
-others:
+\texttt{HOL} is currently the best developed Isabelle object-logic, including
+an extensive library of (concrete) mathematics, and various packages for
+advanced definitional concepts (like (co-)inductive sets and types,
+well-founded recursion etc.). The distribution also includes some large
+applications. See the separate manual \emph{Isabelle's Logics: HOL}. There
+is also a comprehensive tutorial on Isabelle/HOL available.
+\texttt{ZF} provides another starting point for applications, with a slightly
+less developed library than \texttt{HOL}. \texttt{ZF}'s definitional packages
+are similar to those of \texttt{HOL}. Untyped \texttt{ZF} set theory provides
+more advanced constructions for sets than simply-typed \texttt{HOL}.
+\texttt{ZF} is built on \texttt{FOL} (first-order logic), both are described
+in a separate manual \emph{Isabelle's Logics: FOL and ZF}~\cite{isabelle-ZF}.
+
+\medskip There are some further logics distributed with Isabelle:
\begin{ttdescription}
\item[\thydx{CCL}] is Martin Coen's Classical Computational Logic,
which is the basis of a preliminary method for deriving programs from
@@ -17,14 +28,9 @@
\item[\thydx{LCF}] is a version of Scott's Logic for Computable
Functions, which is also implemented by the~{\sc lcf}
system~\cite{paulson87}. It is built upon classical~\FOL{}.
-
-\item[\thydx{HOL}] is the higher-order logic of Church~\cite{church40},
-which is also implemented by Gordon's~{\sc hol} system~\cite{mgordon-hol}.
-This object-logic should not be confused with Isabelle's meta-logic, which is
-also a form of higher-order logic.
-
-\item[\thydx{HOLCF}] is a version of {\sc lcf}, defined as an
- extension of \texttt{HOL}\@.
+
+\item[\thydx{HOLCF}] is a version of {\sc lcf}, defined as an extension of
+ \texttt{HOL}\@. %FIXME See \cite{MNOS98} for more details on \texttt{HOLCF}.
\item[\thydx{CTT}] is a version of Martin-L\"of's Constructive Type
Theory~\cite{nordstrom90}, with extensional equality. Universes are not
@@ -44,19 +50,20 @@
\item[\thydx{ILL}] implements intuitionistic linear logic.
\end{ttdescription}
-The logics \texttt{CCL}, \texttt{LCF}, \texttt{HOLCF}, \texttt{Modal}, \texttt{ILL} and {\tt
- Cube} are undocumented. All object-logics' sources are
-distributed with Isabelle (see the directory \texttt{src}). They are
-also available for browsing on the WWW at
+The logics \texttt{CCL}, \texttt{LCF}, \texttt{Modal}, \texttt{ILL} and {\tt
+ Cube} are undocumented. All object-logics' sources are distributed with
+Isabelle (see the directory \texttt{src}). They are also available for
+browsing on the WWW at
\begin{ttbox}
http://www.cl.cam.ac.uk/Research/HVG/Isabelle/library/
http://isabelle.in.tum.de/library/
\end{ttbox}
Note that this is not necessarily consistent with your local sources!
-\medskip Do not read this manual before reading \emph{Introduction to
- Isabelle} and performing some Isabelle proofs. Consult the {\em Reference
- Manual} for more information on tactics, packages, etc.
+\medskip Do not read the \emph{Isabelle's Logics} manuals before reading
+\emph{Isabelle/HOL --- The Tutorial} or \emph{Introduction to Isabelle}, and
+performing some Isabelle proofs. Consult the {\em Reference Manual} for more
+information on tactics, packages, etc.
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