Possible worlds models were introduced by Saul Kripke in the
early 1960s. Basically, a possible world's model is nothing but a
graph with labelled nodes and labelled edges. Such graphs provide
semantics for various modal logics (alethic, temporal, epistemic
and doxastic, dynamic, deontic, description logics) and also turned
out useful for other nonclassical logics (intuitionistic,
conditional, several paraconsistent and relevant logics). All these
logics have been studied intensively in philosophical and
mathematical logic and in computer science, and have been applied
increasingly in domains such as program semantics, artificial
intelligence, and more recently in the semantic web. Additionally,
all these logics were also studied proof theoretically. The proof
systems for modal logics come in various styles: Hilbert style,
natural deduction, sequents, and resolution. However, it is fair to
say that the most uniform and most successful such systems are
tableaux systems. Givenlogic and a formula, they allow one to check
whether there is a model in that logic. This basically amounts to
trying to build a model for the formula by building a tree.
This book follows a more general approach by trying to build a
graph, the advantage being that a graph is closer to a Kripke model
than a tree. It provides a step-by-step introduction to possible
worlds semantics (and by that to modal and other nonclassical
logics) via the tableaux method. It is accompanied by a piece of
software called LoTREC (www.irit.fr/Lotrec). LoTREC allows to check
whether a given formula is true at a given world of a given model
and to check whether a given formula is satisfiable in a given
logic. The latter can be done immediately if the tableau system for
that logic has already been implemented in LoTREC. If this is not
yet the case LoTREC offers the possibility to implement a tableau
system in a relatively easy way via a simple, graph-based,
interactive language."
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