It seems uncontroversial that Dalton wrongly believed that atoms are indivisible. However, the correct analysis of Dalton’s belief and the way it relates to contemporary beliefs about atoms is, on closer inspection, far from straightforward. In this paper, I introduce four features that any candidate analysis is plausibly bound to respect. I argue that theories that individuate concepts at the level of understanding are doomed to fail in this endeavor. I formally sketch an alternative and suggest that cases such as (...) the one presented provide support for the claim that the genuine source for concept individuation is public sharable thought. (shrink)

In this paper, we bring into focus the level of thought or content in the elucidation of disagreement. We set out the view that disagreement at this level involves a specific form of noncotenability, namely, noncotenability as captured by sense or intension as opposed to reference. We present the challenge that nourishes the alternative referential view and suggest, through examples, that (i) only intensional disagreement is apt to adequately accommodate basic rationality constraints on disagreement, and (ii) it can meet the (...) aforementioned challenge insofar as we discriminate between noncotenability affecting one's concepts, intensionally conceived, and noncotenability affecting merely one's particular understanding of those concepts. We conclude that intensional disagreement is our best choice for an account of disagreement at the level of thought. (shrink)