More on Haecceitism and Possible Worlds

Abstract

Anti-haecceitism is the thesis that the universe could not be nonqualitatively different without being qualitatively different. Haecceitism is the denial of anti-haecceitism.1 In “Haecceitism, Anti-Haecceitism, and Possible Worlds” (Skow 2008), I argued that there are no nontendentious definitions of “haecceitism” and “anti-haecceitism” using possible-worlds talk. For any candidate definition of “anti-haecceitism” that uses possible-worlds talk, there is some theory of possible worlds relative to which that definition is not equivalent to anti-haecceitism.