The dissertation is a defense of realism about propositions . According to the propositionlist, there is a realm of entities that simultaneously serve as inter-subjectively shareable "objects" or "contents" of assertion and belief, as units of information more generally, as fundamental bearers of truth-values, and as entities capable of having certain modal, logical and epistemological properties. ;In chapter one, I flesh out a traditional concept of proposition, and I sketch a general argument …
Read moreThe dissertation is a defense of realism about propositions . According to the propositionlist, there is a realm of entities that simultaneously serve as inter-subjectively shareable "objects" or "contents" of assertion and belief, as units of information more generally, as fundamental bearers of truth-values, and as entities capable of having certain modal, logical and epistemological properties. ;In chapter one, I flesh out a traditional concept of proposition, and I sketch a general argument in favor of propositionalism. ;In chapter two, I argue that we cannot do away with propositions by employing other entities--e.g., sentences, utterances, facts--that we may have already admitted into our ontology. And I argue that we cannot explain away the evidence that supports propositionalism by appealing to some "unloaded" notion of existence. ;In chapter three, I go part way towards dispelling the worry that various types of conceptual messiness --indeterminacy, holism and vagueness--pose a problem for propositionalism. ;In chapter four, I take up my central concern: the problem of identity conditions. I argue that the correct theory of identity conditions for propositions may be underdetermined by relevant philosophical considerations. ;In chapter five, I argue that this "underdetermination hypothesis" does not undermine propositionalism, but that it does imply both that propositions are sui generis entities, and that they are "entities without identity". They are sui generis entities in the sense that they cannot be reduced to any entities not already known to be propositions. And propositions are entities without identity in the sense that certain identity statements linking terms for propositions have indeterminate truth-value. This is so because, as the underdetermination hypothesis shows, our concept of proposition is "individuatively vague": when employing the concept we variously slough between several distinct ways of individuating propositions. The indeterminacy of the identity statements is nicely explained by applying a supervaluation semantics over these different schemes of individuation. ;In chapter six, I briefly discuss five lingering questions about the detailed nature of propositions