Geodesic
A simplified proof of arithmetical completeness theorem for provability logic $\mathbf{GLP}$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Algorithmic aspects of algebra and logic, Tome 274 (2011), pp. 32-40

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We present a simplified proof of Japaridze's arithmetical completeness theorem for the well-known polymodal provability logic $\mathbf{GLP}$. The simplification is achieved by employing a fragment $\mathbf J$ of $\mathbf{GLP}$ that enjoys a more convenient Kripke-style semantics than the logic considered in the papers by Ignatiev and Boolos. In particular, this allows us to simplify the arithmetical fixed point construction and to bring it closer to the standard construction due to Solovay. 
@article{TM_2011_274_a3,
     author = {L. D. Beklemishev},
     title = {A simplified proof of arithmetical completeness theorem for provability logic $\mathbf{GLP}$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {32--40},
     publisher = {mathdoc},
     volume = {274},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_274_a3/}
}
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L. D. Beklemishev. A simplified proof of arithmetical completeness theorem for provability logic $\mathbf{GLP}$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Algorithmic aspects of algebra and logic, Tome 274 (2011), pp. 32-40. http://geodesic.mathdoc.fr/item/TM_2011_274_a3/