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  1. A Characteristic Frame for Positive Intuitionistic and Relevance Logic.Yale Weiss - 2020 - Studia Logica 109 (4):687-699.
    I show that the lattice of the positive integers ordered by division is characteristic for Urquhart’s positive semilattice relevance logic; that is, a formula is valid in positive semilattice relevance logic if and only if it is valid in all models over the positive integers ordered by division. I show that the same frame is characteristic for positive intuitionistic logic, where the class of models over it is restricted to those satisfying a heredity condition. The results of this article highlight (...)
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  • There exist exactly two maximal strictly relevant extensions of the relevant logic R.Kazimierz Swirydowicz - 1999 - Journal of Symbolic Logic 64 (3):1125-1154.
    In [60] N. Belnap presented an 8-element matrix for the relevant logic R with the following property: if in an implication A → B the formulas A and B do not have a common variable then there exists a valuation v such that v(A → B) does not belong to the set of designated elements of this matrix. A 6-element matrix of this kind can be found in: R. Routley, R.K. Meyer, V. Plumwood and R.T. Brady [82]. Below we prove (...)
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  • The One-Variable Fragment of T→.John Slaney & Edward Walker - 2014 - Journal of Philosophical Logic 43 (5):867-878.
    We show that there are infinitely many pairwise non-equivalent formulae in one propositional variable p in the pure implication fragment of the logic T of “ticket entailment” proposed by Anderson and Belnap. This answers a question posed by R. K. Meyer.
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  • Admissible Rules and the Leibniz Hierarchy.James G. Raftery - 2016 - Notre Dame Journal of Formal Logic 57 (4):569-606.
    This paper provides a semantic analysis of admissible rules and associated completeness conditions for arbitrary deductive systems, using the framework of abstract algebraic logic. Algebraizability is not assumed, so the meaning and significance of the principal notions vary with the level of the Leibniz hierarchy at which they are presented. As a case study of the resulting theory, the nonalgebraizable fragments of relevance logic are considered.
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  • Sentential constants in R and r⌝.Robert K. Meyer - 1986 - Studia Logica 45 (3):301 - 327.
    In this paper, we shall confine ourselves to the study of sentential constants in the system R of relevant implication.In dealing with the behaviour of the sentential constants in R, we shall think of R itself as presented in three stages, depending on the level of truth-functional involvement.
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  • The philosophy of logical practice.Ben Martin - 2022 - Metaphilosophy 53 (2-3):267-283.
    Metaphilosophy, Volume 53, Issue 2-3, Page 267-283, April 2022.
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  • A Strange Remark Attributed to Gödel.Lloyd Humberstone - 2003 - History and Philosophy of Logic 24 (1):39-44.
    We assemble material from the literature on matrix methodology for sentential logic—without claiming to present any new logical results—in order to show that Gödel once made (or at least, is quoted as having made) an uncharacteristically ill-considered remark in this area.
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  • Notational Variance and Its Variants.Rohan French - 2019 - Topoi 38 (2):321-331.
    What does it take for two logics to be mere notational variants? The present paper proposes a variety of different ways of cashing out notational variance, in particular isolating a constraint on any reasonable account of notational variance which makes plausible that the only kinds of translations which can witness notational variance are what are sometimes called definitional translations.
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  • European Summer Meeting of the Association for Symbolic Logic (Logic Colloquium'88), Padova, 1988.R. Ferro - 1990 - Journal of Symbolic Logic 55 (1):387-435.
  • Single variable formulas in S4→.Michael Byrd - 1976 - Journal of Philosophical Logic 5 (4):439-456.