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% urls in roman style, theory text in math-similar italics \urlstyle{rm} \isabellestyle{it}
\newcommand{\tlastar}{TLA$^{*}$}
\begin{document}
\title{A Definitional Encoding of TLA in Isabelle/HOL} \author{Gudmund Grov \& Stephan Merz} \maketitle
\begin{abstract}
We mechanise the logic \tlastar{} \cite{Merz99}, an extension of Lamport's Temporal Logic of Actions (TLA) \cite{Lamport94} for specifying
and reasoning about concurrent and reactive systems. Aiming at a framework for mechanising the verification
of TLA (or \tlastar{}) specifications, this contribution reuses some elements from a
previous axiomatic encoding of TLA in Isabelle/HOL by the second author\cite{Merz98}, which has been part of the
Isabelle distribution. In contrast to that previous work, we give here a shallow, definitional
embedding, with the following highlights: \begin{itemize} \item a theory of infinite sequences, including a formalisation of the concepts of stuttering invariance central to TLA and TLA*; \item a definition of the semantics of TLA*, which extends TLA by a mutually-recursive definition of formulas and pre-formulas, generalising TLA action formulas; \item a substantial set of derived proof rules, including the TLA* axioms and Lamport's proof rules for system verification; \item a set of examples illustrating the usage of Isabelle/TLA* for reasoning about systems. \end{itemize}
Note that this work is unrelated to the ongoing development of a proof system for the specification language TLA+,
which includes an encoding of TLA+ as a new Isabelle object logic \cite{chaudhuri:tlaps}.
A previous version of this embedding has been used heavily in the work described in \cite{Grov09}. \end{abstract}
\tableofcontents
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