Cut-free sequent and tableau systems for propositional Diodorean modal logics:

Abstract: "We present sound, (weakly) complete and cut-free tableau systems for the propositional normal modal logics S4.3, S4.3.1 and S4.14. When the modality [square] is given a temporal interpretation, these logics respectively model time as a linear dense sequence of points; as a linear dis...

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Bibliographic Details
Main Author: Goré, Rajeev (Author)
Format: Book
Language:English
Published: Cambridge 1993
Series:Computer Laboratory <Cambridge>: Technical report 288
Subjects:
Summary:Abstract: "We present sound, (weakly) complete and cut-free tableau systems for the propositional normal modal logics S4.3, S4.3.1 and S4.14. When the modality [square] is given a temporal interpretation, these logics respectively model time as a linear dense sequence of points; as a linear discrete sequence of points; and as a branching tree where each branch is a linear discrete sequence of points. Although cut-free, the last two systems do not possess the subformula property. But for any given finite set of formulae X the 'superformulae' involved are always bounded by a finite set of formulae X*[subscript L] depending only on X and the logic L. Thus each system gives a nondeterministic decision procedure for the logic in question
The completeness proofs yield deterministic decision procedures for each logic because each proof is constructive. Each tableau system has a cut-free sequent analogue proving that Gentzen's cut-elimination theorem holds for these logics. The techniques are due to Hintikka and Rautenberg.
Physical Description:19 S.

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