Abstract
The provability logic Grz is characterized by a class of modal frames that is not first-order definable. We present a simple embedding of Grz into decidable fragments of classical first-order logic such as FO2 and the guarded fragment. The embedding is an \( \mathcal{O} \) ((n:log n)3)-time transformation that neither involves first principles about Turing machines (and therefore is easy to implement), nor the semantical characterization of Grz (and therefore does not use any second-order machinery). Instead, we use the syntactic relationships between cut-free sequent-style calculi for Grz, S4 and T. We first translate Grz into T, and then we use the relational translation from T into FO2.
Supported by an Australian Research Council Queen Elizabeth II Fellowship.
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Demri, S., Goré, R. (2000). An \( \mathcal{O} \) ((n · log n)3)-Time Transformation from Grz into Decidable Fragments of Classical First-Order Logic. In: Caferra, R., Salzer, G. (eds) Automated Deduction in Classical and Non-Classical Logics. FTP 1998. Lecture Notes in Computer Science(), vol 1761. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-46508-1_10
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