Title: Hyperintensionality, Overfitting, and the Descriptive-Prescriptive Dilemma

Abstract:

A hyperintensional epistemic logic would take the contents which can be known or believed as more fine-grained than sets of possible worlds. I rebut two objections to the very idea: the Descriptive-Prescriptive Dilemma and Williamson’s Objection from Overfitting. I propose a hyperintensional account of propositions as sets of worlds enriched with topics: what those propositions, and so the attitudes towards them, are about. I show that the account captures robust intuitions of same-saying; that it can be pervasively applied in formal and mainstream epistemology; and that it is left unscathed by both objections.