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Constructive Modalities with Provability Smack

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Leo Esakia on Duality in Modal and Intuitionistic Logics

Part of the book series: Outstanding Contributions to Logic ((OCTR,volume 4))

Abstract

I overview the work of the Tbilisi school on intuitionistic modal logics of well-founded/scattered structures and its connections with contemporary Theoretical Computer Science. Fixed-point theorems and their consequences are of particular interest.

To the memory of Leo Esakia and Dito Pataraia

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Notes

  1. 1.

    The reader has to be warned that the notation in this section differs somewhat from that in references like [8183].

  2. 2.

    Speaking of [57], footnote 4 provides an argument that the plural form intended by Grothendieck was toposes rather than topoi. I stick to the same convention, also because—as a quick Google search shows—the form toposes is used mostly by mathematicians, whereas topoi seems prevalent for unrelated notions in the humanities. Besides, this was the form used by Leo, Mamuka and Dito.

  3. 3.

    Note that toposes very rarely happen to mimic sets in having enough global elements to determine all subobjects; such special toposes are called well-pointed.

  4. 4.

    Reader should be warned that in most of categorical literature, presheaves are assumed to be contravariant, but see, e.g., [39] for an example of the covariant convention.

  5. 5.

    The corresponding theorem in [30] contained also an additional statement about density of the support of the fixed-point subobject, but this does not seem essential for us here.

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Acknowledgments

Special thanks are due to: the anonymous referee for careful reading and many helpful comments; Guram Bezhanishvili, for an invitation to write this chapter, but also his tolerance, understanding and patience during the whole process; Alexander Kurz for his support, interest and numerous discussions; Mamuka Jibladze and the late Dito Pataraia, particularly for all the discussions we had in Kutaisi. Apart from this, the list of people who provided feedback and/or suggestions include (in no particular order) Lars Birkedal, Rasmus Møgelberg, Stefan Milius, Thomas Streicher, Sam Staton, Alex Simpson, Gordon Plotkin, Johan van Benthem, Ramon Jansana, Achim Jung, Andrew Pitts, Conor McBride, Nick Benton, Guilhem Jaber, Dirk Pattinson, Drew Moshier, Nick Bezhanishvili, Alexei Muravitsky, Fredrik Nordvall Forsberg, Ben Kavanagh, Oliver Fasching, participants of Domains X, TYPES 2011, MGS 2012 and seminars at the University of Leicester. During most of the write-up, I was supported by the EPSRC grant EP/G041296/1.

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Litak, T. (2014). Constructive Modalities with Provability Smack. In: Bezhanishvili, G. (eds) Leo Esakia on Duality in Modal and Intuitionistic Logics. Outstanding Contributions to Logic, vol 4. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8860-1_8

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