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On Provability Logics with Linearly Ordered Modalities

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We introduce the logics GLP Λ, a generalization of Japaridze’s polymodal provability logic GLP ω where Λ is any linearly ordered set representing a hierarchy of provability operators of increasing strength. We shall provide a reduction of these logics to GLP ω yielding among other things a finitary proof of the normal form theorem for the variable-free fragment of GLP Λ and the decidability of GLP Λ for recursive orderings Λ. Further, we give a restricted axiomatization of the variable-free fragment of GLP Λ.

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Beklemishev, L.D., Fernández-Duque, D. & Joosten, J.J. On Provability Logics with Linearly Ordered Modalities. Stud Logica 102, 541–566 (2014). https://doi.org/10.1007/s11225-013-9490-7

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