∗ Apologies to Mark Hinchliff for stealing the title of his dissertation. (See Hinchliff, A Defense of Presentism. As it turns out, however, the version of Presentism defended here is different from the version defended by Hinchliff. See Section 3.1 below.).

While many are impressed with the utility of possible worlds in linguistics and philosophy, few can accept the modal realism of David Lewis, who regards possible worlds as sui generis entities of a kind with the concrete world we inhabit.1 Not all uses of possible worlds require exotic ontology. Consider, for instance, the use of Kripke models to establish formal results in modal logic. These models contain sets often regarded for heuristic reasons as sets of “possible worlds”. But the “worlds” (...) in these sets can be anything at all; they can be numbers, or people, or sh. The set of worlds, together with the accessibility relation and the rest of the model, is used as a purely formal structure.2 One can even go beyond establishing results about formal systems and apply Kripke models to English, as Charles Chihara has recently argued.3 Chihara shows, for instance, how to use Kripke models (plus primitive modal notions) to give an account of validity for English modal sentences. In other cases worlds are not really needed at all. It is often vivid to give a counterexample thus: “There is a possible world in which P. Since your theory implies that in all worlds, not-P, your theory is wrong.” But the counterexample could just as easily be given using modal operators: “Possibly, P. Since your theory implies that it is necessary that not-P, your theory is wrong.”. (shrink)

Presentism is the doctrine that only the present is real. Since ordinary talk and thought are full of quantification over non-present objects, presentists are in a familiar predicament: in their unreflective moments they apparently commit themselves to far more than their ontological scruples allow. A familiar response is to begin a project of paraphrase. Truths appearing to quantify over problematic entities are shown, on analysis, to not involve quantification over those entities after all. But I think that we might be (...) better off abandoning paraphrase altogether. I suggest a project of discovering “underlying truths” rather than paraphrases. I will explore this strategy as applied to defending presentism, but my hope is that lovers of desert landscapes everywhere will herein find words of comfort. (shrink)

It’s well known that one way to cure a hangover is by a “hair of the dog” — another alcoholic drink. The drawback of this method is that, so it would appear, it cannot be used to completely cure a hangover, since the cure simply induces a further hangover at a later time, which must in turn either be cured or suffered through.

Many philosophers, following David Lewis, believe that we should look to counterpart theory, not quantified modal logic, as a means of understanding modal discourse. We argue that this is a mistake. Significant parts of modal discourse involve either implicit or explicit reference to what is actually the case, raising the question of how talk about actuality is to be represented counterpart-theoretically. By considering possible modifications of Lewis's counterpart theory, including actual modifications due to Graeme Forbes and Murali Ramachandran, we argue (...) that no coherent version of counterpart theory can provide a plausible representation of talk about actuality, and so, we conclude, counterpart theory should be rejected. (shrink)

This article characterizes the varieties of four - dimensionalism and provides a critical overview of the main arguments in support of it.

The dissertation is a defense of presentism, the thesis that only presently existing things exist. Many arguments against presentism, including those of McTaggart and Mellor, rely on the claim that the tenses are indexicals. In the first chapter I argue that which aspects of language are indexical depends on what there is. In particular, I argue that if presentism is true, the tenses are not indexicals. I base my response to McTaggart's argument for the unreality of tense on the claim (...) that the tenses are not indexicals. I include a modal analogue of McTaggart's argument, an argument for the unreality of the contingent, and respond to it in an analogous way. ;In the second chapter I discuss serious presentism, the thesis that objects have properties only when they exist. I discuss arguments by Plantinga and Prior and conclude that a presentist need not be a serious presentist and that serious presentism is false, false because present objects have properties when they do not exist, and false because past and future objects have properties now. I argue that a presentist, though not a serious presentist, can account for the independence of the past from the present without admitting the existence of past objects. ;One issue related to serious presentism is whether the presentist's quantifiers range over present objects only or over past and future objects as well. I argue that a presentist's quantifiers need not be existential and may range over past, present, and future objects. In the final chapter I develop a version of presentism I call unrestricted presentism. (shrink)