1. Consider a circle. It has both a radius and a circumference. There is obviously a real distinction between the properties having a radius and having a circumference. This is not because, when confining ourselves to circles,1 having a radius can ever exist apart from having a circumference. A real distinction does not depend on that. Descartes thought that a real distinction between x and y meant that x could exist without y or vice versa, if only by the power (...) of God. But Descartes was wrong. Separable existence is a sufficient but not necessary condition of there being a real distinction. The difference between a real and a conceptual distinction derives from medieval philosophy. Aquinas, for one, held that things can be really distinct even though not separable (the form and matter of a material substance or its essence and existence, for example).2 For a merely conceptual distinction between x and y to exist, it is necessary for the distinction to exist in thought only. There is only a conceptual distinction between an upward slope and a downward slope, or between a glass’s being half empty and half full. Not only are the members of such pairs inseparable (whether by God or in any other way), but there is no real distinction between them. There is no numerical distinctness between the entities or qualities between which there is only a conceptual distinction. To this extent alone is Galen Strawson (2008) correct.3 But when it comes to.. (shrink)

Arguing first that the best way to understand what a continuant is is as something that primarily has its properties at a time rather than atemporally, the paper then defends the idea that there are occurrent continuants. These are things that were, are, or will be happening—like the ongoing process of someone reading or my writing this paper, for instance. A recently popular philosophical view of process is as something that is referred to with mass nouns and not count nouns. (...) This has mistakenly encouraged the view that the only way to think of process is as the stuff of events, and has obscured the possibility of thinking of processes as individual continuants. (shrink)

Nicholas Shackel (2011) has proposed a number of arguments to save the Dipert–Bird model of physical reality from the sorts of unpalatable consequence I identified in Oderberg 2011. Some consequences, he thinks, are only apparent; others are real but palatable. In neither case does he seem to me to have deflected the concerns I raised, leaving graph structuralism on Dipert–Bird lines as problematic as ever.

Metaphysical theories of change incorporate substantive commitments to theories of persistence. The two most prominent classes of such theories are endurantism and perdurantism. Defenders of endurancestyle accounts of change, such as Klein, Hinchliff, and Oderberg, do so through appeal to a priori intuitions about change. We argue that this methodology is understandable but mistaken—an adequate metaphysics of change must accommodate all experiences of change, not merely intuitions about a limited variety of cases. Once we examine additional experiences of change, particularly (...) those in (special) relativistic circumstances, it becomes clear that only a perdurance account of change is adequate. (shrink)

Traditionally, this puzzle has been solved in various ways. Aristotle, for example, distinguished between “accidental” and “essential” changes. Accidental changes are ones that don't result in a change in an objects' identity after the change, such as when a house is painted, or one's hair turns gray, etc. Aristotle thought of these as changes in the accidental properties of a thing. Essential changes, by contrast, are those which don't preserve the identity of the object when it changes, such as when (...) a house burns to the ground and becomes ashes, or when someone dies. Armed with these distinctions, Aristotle would then say that, in the case of accidental changes, (1) and (2) are both false—a changing thing can really change one of its “accidental properties” and yet literally remain one and the same thing before and after the change. (shrink)

A critical survey of the main metaphysical theories concerning the nature of material objects (substratum theories, bundle theories, substance theories, stuff theories) and their identity conditions, both synchronic (monist vs. pluralist theories) and diachronic (three-dimensionalism, four-dimensionalism, sequentialism).

If something changes from being in one state to being in another state, when exactly does it change? And what’s going on at that time? These questions are often discussed under the heading of the ‘moment’ or ‘instant’ of change. In this paper, I will investigate a view on which there is an intrinsically distinguished, atomic time at which something changes, and at that time it is metaphysically indeterminate what is the case. The background metaphysical picture is situationalism, a theory (...) on which reality is composed of irreducibly conflicting parts. These conflicting parts give rise to unsettledness in reality as a whole, and also at the point of change. I propose this view as a competitor for existing accounts of the time of change, and spell out a few reasons in its favour. (shrink)

Modal Plenitude—the view that, for every empirically adequate modal profile, there is an object whose modal profile it is—is held to be consistent with each of endurantist and perdurantist (three- and four-dimensionalist) views of persistence. Here I show that, because “endurer” and “perdurer” are two substantially different kinds of entity, compossible with each other and consistent with empirical data, Modal Plenitude actually entails a third view about persistence that I call “Persistence Egalitarianism.” In every non-empty spacetime region there are two (...) persisting objects: one that endures through the temporal dimension of that region, and another that perdures through the region. Additionally, if the argument from anthropocentrism makes a strong case for Modal Plenitude, then an equally strong and parallel case supports Persistence Egalitarianism. I close with the meta-semantic consequences of persistence egalitarianism for ordinary object talk. (shrink)