1. Ole Thomassen Hjortland (2014). Speech Acts, Categoricity, and the Meanings of Logical Connectives. Notre Dame Journal of Formal Logic 55 (4):445-467.
    In bilateral systems for classical logic, assertion and denial occur as primitive signs on formulas. Such systems lend themselves to an inferentialist story about how truth-conditional content of connectives can be determined by inference rules. In particular, for classical logic there is a bilateral proof system which has a property that Carnap in 1943 called categoricity. We show that categorical systems can be given for any finite many-valued logic using $n$-sided sequent calculus. These systems are understood as a further development (...)
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  2. Ole Thomassen Hjortland (2013). Logical Pluralism, Meaning-Variance, and VerbalDisputes. Australasian Journal of Philosophy 91 (2):355-373.
    Logical pluralism has been in vogue since JC Beall and Greg Restall 2006 articulated and defended a new pluralist thesis. Recent criticisms such as Priest 2006a and Field 2009 have suggested that there is a relationship between their type of logical pluralism and the meaning-variance thesis for logic. This is the claim, often associated with Quine 1970, that a change of logic entails a change of meaning. Here we explore the connection between logical pluralism and meaning-variance, both in general and (...)
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  3. Julien Murzi & Ole Thomassen Hjortland (2009). Inferentialism and the Categoricity Problem: Reply to Raatikainen. Analysis 69 (3):480-488.
    It is sometimes held that rules of inference determine the meaning of the logical constants: the meaning of, say, conjunction is fully determined by either its introduction or its elimination rules, or both; similarly for the other connectives. In a recent paper, Panu Raatikainen (2008) argues that this view - call it logical inferentialism - is undermined by some "very little known" considerations by Carnap (1943) to the effect that "in a definite sense, it is not true that the standard (...)
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