The Problem Of Transworld Identity And Transworld Identification In The Possible World Semantics

In the fifties or sixties of twentieth century, in view of the needs of the development of modal logic, Logicians represented by Kripke, established a set of modal semantic theory——Possible Worlds Semantics, which is based on the idea of "possible worlds" of Leibniz. However, though the Possible World Semantics makes us understanding of modal expressions more intuitively, many problems emerge still. The identity of the individual cross-border issue is one of such hot issues.The transworld identity and transworld identification issue refers to whether individual may be able to exist across the different possible worlds in different possible worlds, and if it is, then how can we identify them. This problem originated when we interpret de re modal with the possible worlds semantics. Based on their own understanding of the concept of the possible worlds, Scholars take different attitude towards the issues of identity of the individual cross-border.Starting from origin of the issues of the identity of individual cross-border, the paper introduces different views regarding this issue, such as Chisholm, Kripke, D. Lewis, Chen Bo and the like. We've introduced the view of moderate realism of Kripke's possible world, the theory of rigid designator, the idea of essentialism and the historical and casual theory of naming. And we ve also introduced the extreme point of view of possible world and the counterpart theory of D.Lewis. Furthermore, the Polemics between D. Lewis and Kripke.This total is divided into five parts.The first chapter is an introduction, which introduce scholars articles and books related to the individual cross-border issues.The second chapter introduces the historical development of modal logic, and the basic contents of possible world semantics, as well as the analysis of the origin of the transworld identity and transworld identification. The third chapter introduces different understandings of the possible word between different logicians. It is mainly about the view of moderate realism, extreme realism, and the idea of tools.Chapter four introduces different approaches to the issue of the transworld identity and ideas of Chisholm, Kripke, D. Lewis and ChenBo, especially Kripke and D·Lewis.In chapter five, we evaluate their theories, analyses their advantages and disadvantages and give my own point of view.