Abstract for “Stalnaker on Propositional Contingentism” – Peter Fritz

In his recent book “Mere Possibilities”, Robert Stalnaker argues for propositional contingentism, the claim that it is contingent what propositions there are. In a short appendix, he provides two ways of modeling the contingent existence of propositions, and claims that they are equivalent. In this paper, I show that this is incorrect, and argue that one of Stalnaker’s proposals is inadequate. I go on to show that by strengthening it in a philosophically well-motivated way, the equivalence can be established, resulting in two classes of models which capture the same theory of the contingent existence of propositions.