The Finite Model Property of Quasi-transitive Modal Logic

02/26/2018

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by   Zhe Lin, et al.

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The finite model property of the quasi-transitive modal logic K_2^3=K⊕ p p is proved. This modal logic is conservatively extended to the tense logic Kt_2^3. We present a Gentzen sequent calculus Gt_2^3 for Kt_2^3 which admits cut elimination. The sequent calculus Gt_2^3 is shown to have the finite model property by a construction of finite syntactic model. It follows that Kt_2^3 has the finite model property. And the quasi-transitive modal logic K_2^3 has the finite model property.