BIROn - Birkbeck Institutional Research Online

    Undecidability of first-order intuitionistic and modal logics with two variables

    Kontchakov, Roman and Kurucz, A. and Zakharyaschev, M. (2005) Undecidability of first-order intuitionistic and modal logics with two variables. The Bulletin of Symbolic Logic 11 (5), p. 428. ISSN 1079-8986.

    Full text not available from this repository.


    We prove that the two-variable fragment of first-order intuitionistic logic is undecidable, even without constants and equality. We also show that the two-variable fragment of a quantified modal logic L with expanding first-order domains is undecidable whenever there is a Kripke frame for L with a point having infinitely many successors (such are, in particular, the first-order extensions of practically all standard modal logics like K, K4, GL, S4, S5, K4.1, S4.2, GL.3, etc.). For many quantified modal logics, including those in the standard nomenclature above, even the monadic two-variable fragments turn out to be undecidable.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Computing and Mathematical Sciences
    Depositing User: Sarah Hall
    Date Deposited: 11 May 2021 17:52
    Last Modified: 09 Aug 2023 12:50


    Activity Overview
    6 month trend
    6 month trend

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item