A Puzzle about Disagreement

A well-known (roughly Fregean) strategy for dealing with Kripke’s 1979 Pierre-puzzle is to appeal to differing senses or modes of presentation in the characterization of Pierre’s beliefs. However, differing senses or modes of presentation in the characterization of an agent’s beliefs conceal, in this context, another equally challenging puzzle about disagreement. Apparently therefore, theorists are required to pay attention to both sorts of puzzles in order to offer a satisfactory solution to the Pierre case.