 There has been a tendency recently to view the problem of the unity of the proposition as a useful heuristic in interpreting views of Frege, Russell, and Wittgenstein. We can see this in Davidson’s (2005) posthumous work on truth and predication, where he often runs together the ontological and the semantic versions of what he refers to as “the problem of predication”. More careful work on this issue has been recently done by Gaskin (1995, 2008) and Collins (2011). The particularly obscure nature of the debate between Russell and Wittgenstein over Russell’s theory of judgment has lent itself to being interpreted as concerning the problem of the unity of the proposition. For such an interpretation see in particular Hanks (2007).