Abstract

In Towards Non-Being Graham Priest proposes an informative criterion of identity across possible worlds. Roughly, the criterion says that whenever two objects satisfy the very same qualitative characteristics in every possible world they are identical. But Priest also maintains that there are qualitatively indiscernible possible worlds. It is argued in the paper that for this reason he should allow the existence of two numerically different but qualitatively identical objects, and that is in tension with the criterion of transworld identity he has proposed. Thus Priest should reject either his criterion of transworld identity, or the thesis of possibleexistence of qualitatively indiscernible worlds.