Diversity Reading List

Publisher’s Note: This book is an examination of Plato's treatment of the relation between a whole and its parts in a group of Plato's later works: the Theaetetus, Parmenides, Sophist, Philebus, and Timaeus. Plato's discussions of part and whole in these texts fall into two distinct groups: a problematic one in which he explores, without endorsing, a model of composition as identity; and another in which he develops an alternative to this rejected model. Each model is concerned with the nature of composition of a whole from its parts, such that a whole is an individual, rather than a mere collection or heap. According to the problematic model of composition, a whole is identical to its many parts, that is, the relation of many parts to one whole is just the relation of identity. This model is shown to have the paradoxical consequence that the same thing(s) is (or are) both one thing and many things, and for this reason, amongst others, it cannot support an adequate account of composition. According to the alternative model of composition, wholes of parts are contentful structures (or, instances of such structures), whose parts get their identity only in the context of the whole they compose. Plato presents the structure of such wholes as the proper objects of Platonic science: essentially irreducible, intelligible, and normative in character.

Publisher’s Note:

How do things persist? Are material objects spread out through time just as they are spread out through space? Or is temporal persistence quite different from spatial extension? This key question lies at the heart of any metaphysical exploration of the material world, and it plays a crucial part in debates about personal identity and survival. This book explores and compares three theories of persistence — endurance, perdurance, and stage theories — investigating the ways in which they attempt to account for the world around us. Having provided valuable clarification of its two main rivals, the book concludes by advocating stage theory. Such a basic issue about the nature of the physical world naturally has close ties with other central philosophical problems. This book includes discussions of change and parthood, of how we refer to material objects at different times, of the doctrine of Humean supervenience, and of the modal features of material things. In particular, it contains new accounts of the nature of worldly vagueness, and of what binds material things together over time, distinguishing the career of a natural object from an arbitrary sequence of events. Each chapter concludes with a reflection about the impact of these metaphysical debates upon questions about our personal identity and survival.

Abstract: Many of us think that ordinary objects – such as tables and chairs – exist. We also think that ordinary objects have parts: my chair has a seat and some legs as parts, for example. But once we are committed to the thesis that ordinary objects are composed of parts, we then open ourselves up to a whole host of philosophical problems, most of which center on what exactly the composition relation is. Composition as Identity is the view that the composition relation is the identity relation. While such a view has some advantages, there are many arguments against it. In this essay, I will briefly canvass three different varieties of Composition as Identity, and suggest why one of them should be preferred over the others. Then I will outline several versions of the most common objection against CI. I will suggest how a CI theorist can respond to these charges by maintaining that some of the arguments are invalid.