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2018 | OriginalPaper | Buchkapitel

The Completeness Problem for Modal Logic

verfasst von : Antonis Achilleos

Erschienen in: Logical Foundations of Computer Science

Verlag: Springer International Publishing

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Abstract

We introduce the completeness problem for Modal Logic and examine its complexity. For a definition of completeness for formulas, given a formula of a modal logic, the completeness problem asks whether the formula is complete for that logic. We discover that completeness and validity have the same complexity — with certain exceptions for which there are, in general, no complete formulas. To prove upper bounds, we present a non-deterministic polynomial-time procedure with an oracle from PSPACE that combines tableaux and a test for bisimulation, and determines whether a formula is complete.

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Fußnoten
1
According to our definition, for a finite model \(\mathcal {M}=(W,R,V)\) and \(a \in W\), V(a) can be infinite. However, we are mainly interested in \((W,R,V_P)\) for finite sets of propositions P, which justifies calling \(\mathcal {M}\) finite.
 
2
Although for the purposes of this paper we only consider a specific set of modal logics, it is interesting to note that the corollary can be extended to a much larger class of logics.
 
3
This is also a corollary of Lemma 4, as these are extensions of D and T.
 
4
We note that US is different from UP; for UP, if T has an accepting path for x, then it is guaranteed that it has a unique accepting path for x.
 
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Metadaten
Titel
The Completeness Problem for Modal Logic
verfasst von
Antonis Achilleos
Copyright-Jahr
2018
DOI
https://doi.org/10.1007/978-3-319-72056-2_1

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