Abstract

This paper is a response to Tim Williamson's "The Contingent A Priori: Has It Anything To Do With Indexicals?" In that paper, Williamson claims to have produced an instance of a deeply contingent a priori truth that in no way turns on indexicals. In this paper, I suggest that Williamson has failed to substantiate this claim. In particular, I claim that one cannot know a priori that there is at least one believer without relying on some kind of indexicality.