Linguistic modal conventionalism in the real world

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2018

Authors

Due, Clare

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Abstract

This thesis examines the prospects for a theory of metaphysical modality according to which modal truth is determined by conventional rules governing the terms in a natural language. I label this theory ‘linguistic modal conventionalism’, or ‘LMC’. My focus is on articulating and responding to a specific objection to LMC: the objection that conventionalism about the modal features of objects and propositions leads to conventionalism about ordinary objects and non-modal truth. The first part of the thesis sets out the theoretical background for LMC by describing its empiricist and naturalistic motivations, its historical background, and its modern variants. I argue that modern versions of LMC are able to respond to the Quinean and Kripean challenges that faced the theory’s positivist predecessors. The middle part of the thesis is devoted to describing the threat of object and truth conventionalism. I argue that the tight connection between an object’s conditions of existence and its modal properties means that conventionalism about modal properties leads to conventionalism about objects themselves. Similarly, the modal nature of a proposition’s truth conditions means that conventionalism about modal features of propositions leads to conventionalism about non-modal truth. The final chapters of the thesis present a way for LMC to respond to these threats. I argue that the theory should do away with the problematic ontology by rejecting modal features of objects and propositions, and providing truth conditions for modal sentences in terms of linguistic rules directly. After describing the metaphysics and semantics of this position, I conclude by responding to a number of potential objections for LMC, and by arguing that it satisfies the empiricist and naturalist desiderata by which it is motivated.

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Thesis (PhD)

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