Assuming minimal fine-individuation--that there are some necessarily equivalent intensional objects (e.g. propositions) that are nonetheless distinct objects, on standard actualist frameworks, the answer to our title question is "No". First I specify a fully cognitively accessible, purely qualitative maximal consistent state of affairs (MCS). (That there is an MCS that is either fully graspable or purely qualitative is in itself quite contrary to conventional dogma.) Then I identify another MCS, one necessarily equivalent to the first. It follows that there could (...) have been more than one obtaining MCS. I then argue that there is more than one obtaining MCS. So there is nothing answering to "the actual world", and the set of worlds is not the set of MCSs. I explore various patch-ups. Finally, I compare the actualist and modal realist notions of worlds, and I argue that even if the realist were right about concrete world ensembles, our reflections indicate that necessary truth is not truth in all worlds anyway, which undercuts the rationale for the realist's program. (shrink)

In this dissertation, I develop an interpretation of Leibniz on modality and free will. I do so for two reasons: first, I am attempting to revitalize the notion that Leibniz is the predecessor of contemporary modal semantics; second, I am using Leibniz's philosophical system to motivate responses to contemporary philosophical issues in modality and free will. In Chapter One, I argue that Leibniz's basic principles are plausible theoretical tools that ought to be used by contemporary philosophers in developing their philosophical (...) systems. In Chapter Two, I develop Leibniz's views on the nature of individuals. I argue that possible individuals are actually of the same sort as individuals in the actual world--possible individuals and actual individuals are complete creatures that do not differ ontologically from each other. In Chapter Three, I argue that Leibniz's views on possible individuals make him a modal realist and compare his view with contemporary modal realism in order to support this claim. I also argue that counterparts avoid many of the problems set for them by contemporary thinkers; I end with the ways that Leibniz's view differs from contemporary accounts. In Chapter Four, I argue that Leibniz provides two different analyses of modality. The first is an infinite analysis account; the second is a possible worlds account. I argue that these two accounts are compatible and amount to two different descriptions of the same theory of modality. I address objections to each account in order to show this. In Chapter Five, I argue that Leibniz is a compatibilist about free will. Importantly, I argue that it is precisely Leibniz's account of modality that allows for this compatibilism, as against a necessitarian like Spinoza. I then use Leibniz's account to challenge contemporary libertarians about free will on the basis of the principle of sufficient reason. I also show how Leibniz can help semicompatibilism avoid a worry concerning necessitarianism. At the end of the day, I claim that adopting elements of Leibniz's system can help us better understand modality and the freedom of the will and can be an aid in furthering contemporary philosophical theory. (shrink)