Journal of Philosophical Logic

, Volume 31, Issue 4, pp 359–386 | Cite as

Modal Logic, Truth, and the Master Modality

  • Torben Braüner


In the paper (Braüner, 2001) we gave a minimal condition for the existence of a homophonic theory of truth for a modal or tense logic. In the present paper we generalise this result to arbitrary modal logics and we also show that a modal logic permits the existence of a homophonic theory of truth if and only if it permits the definition of a so-called master modality. Moreover, we explore a connection between the master modality and hybrid logic: We show that if attention is restricted to bidirectional frames, then the expressive power of the master modality is exactly what is needed to translate the bounded fragment of first-order logic into hybrid logic in a truth preserving way. We believe that this throws new light on Arthur Prior's fourth grade tense logic.

homophonic theories of truth hybrid logic modal logic 


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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Torben Braüner
    • 1
  1. 1.Department of Computer ScienceRoskilde UniversityRoskildeDenmark

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