THE UNIQUENESS OF OBJECTS IN G.W. LEIBNIZ’S POSSIBLE WORLDS
I.V. BerestovThe author analyzes the Leibniz’s idea of “uniqueness of objects”, i.e. his conclusion that every possible object is present in one and only one possible world. The article reveals the role of the principle of indistinguishability of identity in this conclusion, referring to the discussions in modern philosophy, which are generated by similar conclusions. Leibniz treats any possible world as a holistic system. This places his reasoning in the context of disputes about the validity of various holistic approaches. Leibniz accepts the “Holistic Assumption”, according to which all objects of one possible world are determined through each other. The article also shows how Leibniz’s “uniqueness of objects” logically connects his teaching with certain statement of the problem of intentional identity, as well as with ongoing discussions about mental holism. The author demonstrates that Leibniz did something more than the developing of the theory of metaphysical possible worlds – which, thanks to the works of S. Kripke, became the “canonical” semantics for modal logic. In addition, Leibniz stood at the beginning of understanding the possible worlds as corresponding to the subject of cognition’s perceptions. Thus, Leibniz also made a step towards the development of the semantics of epistemic logic that was proposed by J. Hintikka. The interpretation of the problem of intentional identity in E. Saarinen’s works is based on the accepting of the “uniqueness of objects” for many worlds, which are open to certain subject, and not for one and only one possible world, as in Leibniz’s works. The author concludes that the ways of generating the problem of intentional identity for Leibniz’s semantics and the ones for Saarinen’s semantics are similar. All this shows that the problems stated by Leibniz’s possible worlds semantics have been still discussed.