David Lewis

Mind, Vol. LXXXVI (April, 1977) pp. 242-248.

I defend normative realism—the claim that there are mind-independent, absolute normative facts—mostly by arguing against its rivals. Against mind-dependent theories of normativity, I argue that at least one highly influential version of such a view, Lewis's dispositional theory of value, is subject to at least three severe problems: the problem of the implausible contingency of value, the problem of ideal conditions, and the problem of lack of convergence. Against relativistic conceptions of normativity, I argue that either they fail to evade (...) a commitment to absolute normative truths, or they fail to distinguish themselves from Nihilism. Finally, against Nihilism, I argue that it is not a coherent option at least for the normative domain of rationality, since facts about rationality are presupposed by any judgment, including any judgment meant to express a skepticism about facts about rationality. (shrink)

This article brings two outstanding figures into conversation about the problem of fictional entities and their indeterminacies: Roman Ingarden and David Lewis. Lewis’s account of fiction lacks an adequate ontology of ficta-qua-objects. Relying on his modal realism does not help, for it would make ficta “concrete” entities that merely indexically differ from our world’s entities. In this regard, I refer to Ingarden’s “purely intentional entities”. I read Lewis’s possible worlds in terms of Ingarden’s ontology; hence establishing what I term a (...) “Purely Intentional Modal Fictionalism”. In so doing, the demarcation between fiction and actuality is preserved. In return, Lewis’s Analyses adequately account for Ingarden’s “spots of indeterminacy”. Therefore, my proposal reconciles Ingarden’s ficta with Lewis’s possibilist approach to truth in fiction. This approach grounds Lewis’s account in a less problematic ontology with a distinct sui generis status for ficta and provides Ingarden’s ficta with better determination principles. (shrink)

It is shown that one common formulation of Stalnaker's semantics for conditionals is incomplete: it has no sound and (strongly) complete proof system. At first, this seems to conflict with well-known completeness results for this semantics (e.g., Stalnaker and Thomason 1967; Stalnaker 1970 and Lewis 1973, ch. 6). As it turns out, it does not: these completeness results rely on another closely-related formulation of the semantics that is provably complete. Specifically, the difference comes down to how the Limit Assumption is (...) stated. I close with some remarks about what this means for the logic of conditionals. (shrink)

Many things can be other than they are. Many other things cannot. But what are statements like these about? One answer to this question is that we are speaking of possible worlds: if something can be other than it is, then it actually is that way in some possible world. If something cannot be otherwise, it is not otherwise in any world. This answer is presently dominant in analytical philosophy of language and logic. What are these worlds? David Lewis famously (...) claimed that every world exists, just like ours does: there is no difference between the other worlds and ours. In contrast, the medieval thinker John Buridan understands modal logic in terms of objects and causal powers in this world: if something can be other than it is, then there is a causal power that can make it that way. If it cannot, then no causal power—not even God—can alter it, at least without destroying its nature. As we’ll see, the Lewisian plurality is not possible on Buridan’s account; accordingly, a basic tenet of classical theism is untenable on Lewis’s metaphysics. In short, either the Lewisian plurality is incoherent, or a core monotheistic tenet is impossible. (shrink)

In this chapter, I critically examine issues relevant to the construction and reality of social categories, focusing on issues concerning conceptual schemes and conventionalism. Conceptual schemes (‘paradigms,’ ‘linguistic frameworks,’ ‘forms of life’) are systems of concepts that organize and give (intersubjective) meaning to empirical experience. In discussions about the construction of social categories, a common assumption is that social categories and kinds (e.g., ‘money,’ ‘marriage,’ ‘liberal’) require the presupposition of a conceptual scheme that gives meaning to those terms. One prominent (...) position in social ontology (Lewis, 1969, Gilbert 1989, 2014, Searle 1995) holds that the reality of social categories is grounded in a conventionalist conceptual scheme: social categories are conventionally accepted categories that reflect explicit or implicit agreements within a community. According to this view, the reality of social categories and kinds is established (and maintained) by contingent and arbitrary conventional decisions about social categories (e.g., laws about legal tender, marriage laws, the one-drop rule). Conventions can be understood as social customs (e.g., rules governing traffic, marriage laws, institutionalized rules about sex and gender) that serve some human purpose or interest. They are important for the establishment and maintenance of social norms (see Bicchieri 2006, 2017). -/- The chapter proceeds as follows. In section 2, I examine the general idea of conceptual schemes, focusing on Kuhn’s influential theory of paradigms. While Kuhn’s position implies a conceptual relativity and anti-realism (or instrumentalism) about scientific concepts, Davidson and Popper challenge the Kuhnian orthodoxy that the presence of conceptual schemes implies conceptual relativity or ‘incommensurability’ of competing conceptual schemes. I argue that a key difference between scientific and social conceptual schemes is that the former are oriented towards describing nature, whereas the latter are oriented towards social utility or usefulness. In section 3, I examine some foundational works in social ontology—focusing on the accounts of Lewis, Gilbert, and Searle—that hold that social categories are grounded by a conventionalist conceptual scheme. These accounts of social categories imply that the reality of social categories is constituted by (or grounded in) social conventions, which ultimately reflect (or are anchored by) explicit or implicit community-level agreements. In section 4, I survey some prominent accounts of social human categories, focusing on the views of Hacking, Khalidi, Mallon, Haslanger, and Ásta. A common tendency in these accounts is the portrayal of social categories as social to the extent that they are conventionally determined. This suggests that the proper contrast class for social categories is natural categories (as opposed to individual categories or innate categories). (shrink)

Aristotle is essentially human; that is, for all possible worlds metaphysically consistent with our own, if Aristotle exists, then he is human. This is a claim about the essential property of an object. The claim that objects have essential properties has been hotly disputed, but for present purposes, we can bracket that issue. In this essay, we are interested, rather, in the question of whether properties themselves have essential properties (or features) for their existence. We call those who suppose they (...) do “property essentialists”; those who do not, “property anti-essentialists,” or “quidditists.” We offer two complementary arguments. Our total argument is under-girded by two assumptions: transworld identity theory and “received view” counterfactual semantics, a la David Lewis. We then argue that, if one presumes that these are true, then one risks running headlong into paradox if one also accepts property anti-essentialism. That's the first argument. By contrast, if one accepts these same assumptions in conjunction with property essentialism, then the paradox is avoided. This is the second argument. We take it that our arguments work to show that, between property essentialism and quidditism, the property essentialist is on better footing. Plausibly, properties themselves do have essential properties for their existence. (shrink)

The following is a typeset copy of a letter sent by Saul Kripke to David Lewis on August 11, 1969 regarding the article “Counterpart Theory and Quantified Modal Logic” (Lewis, 1968). The original letter was typeset by Mimi Foster (indicated by the initials “mf” at the end of the letter) at Rockefeller University. In consultation with Saul Kripke, we corrected some typos, filled in blank formulas, and added three footnotes. Keywords have been added before the letter, references have been added (...) after the letter, and the original pagination of the letter is reflected in bracketed parentheticals. (The Editors.). (shrink)

Functional reductionism characterises inter-theoretic reduction as the recovery of the upper-level behaviour described by the reduced theory in terms of the lower-level reducing theory. For instance, finding a statistical mechanical realiser that plays the functional role of thermodynamic entropy allows for establishing a reductive link between thermodynamics and statistical mechanics. This view constitutes a unique approach to reduction that enjoys a number of positive features, but has received limited attention in the philosophy of science. -/- This paper aims to clarify (...) the meaning of functional reductionism in science, with a focus on physics, to define both its place with respect to other approaches to reduction and its connection to ontology. To do so, we develop and explore two alternative frameworks for functional reduction, called Syntactic Functional Reductionism and Semantic Functional Reductionism. They represent two different possible stances on the view that expand and improve the basic functional reductionist approach along different lines, and make clear how the approach works in practice. The former elaborates on David Lewis’ account, is connected with the syntactic view of theories, is committed to a logical characterisation of functional roles, and is embedded within Nagelian reductionism. The latter adopts a semantic view of theories, spells out functional roles mainly in terms of mathematical roles within the models of theories, and is expressed in terms of the related structuralist approach to reduction. The development of these frameworks has the final goal of advancing functional reductionism, to make it a fully-fledged alternative account for reduction in science. (shrink)

Some philosophers, most notably David Hume, think that you can imagine colours that you’ve never seen before. Other philosophers, among them David Lewis, L.A. Paul, and Hume again, think that you can’t imagine sensory qualities that lie outwith your past experience. An easy way to reconcile these views is to say that you can imagine colours and other qualities sufficiently similar to those you’ve experienced before: a missing shade of blue, but not totally novel properties. Hence the widespread intuition that (...) someone raised in a monochrome environment could not imagine colours. However, this reconciliation merely raises the questions of why, and how, past experience can facilitate some imaginings and not others. Through consideration of hallucinations, imprisoned colour scientists, flavour design, and the Wagner tuba, this chapter argues against the view that past experience furnishes qualitative material for imaginative blending, and in favour of the Lewisian view that past experience develops the know-how required to imaginatively blend: put somewhat abstractly, it develops the ability to conceive of the experiential space within which novel qualitative appearances might be manifested. The chapter ends by considering extensions of this view from imaginings of novel sensory properties to imaginings of novel sensory and qualitative experiences in the broadest sense. (shrink)

In this paper, I argue that David Lewis’s possible world semantics for counterfactual discourse and for fictional discourse are apparently inconsistent and in need of revision. The problem emerges for Lewis’s account once one considers how to evaluate ambifictional counterfactuals. Since this is likely not a concept familiar to most, and since it does not appear that the problem has been previously recognized in the critical literature, I will begin by rehearsing Lewis’s possible worlds semantics for counterfactuals and fiction. Then (...) I will explicate the distinction between intrafictional, extrafictional, interfictional, and ambifictional propositions. Next, I will state what an ambifictional counterfactual proposition is, and explain why this kind of discourse confounds Lewis’s system. I will conclude, finally, with a brief discussion of how the Lewisian would be best advised to resolve the paradox. (shrink)

Predmet ovog rada je istraživanje i kritika nekih aspekata teorije Dejvida Luisa o tvrđenjima kojima se pripisuje znanje subjektu. U prvom odeljku izlažem skeptički paradoks i osnovne postavke epistemičkog kontekstualizma. U drugom odeljku objašnjavam na koji način Luis kombinuje teoriju relevantnih alternativa i epistemički kontekstualizam prlikom formulisanja svoje teorije o tvrđenjima kojima se pripisuje znanje subjektu. U trećem odeljku pokazujem da ova teorija dopušta postojanje znanja koje je zasnovano samo na ignorisanju i argumentujem da ova nepovoljna posledica proističe iz načina (...) na koji Luis formuliše pravilo verovanja u okviru svoje teorije. U zaključnom odeljku ukazujem na problematične aspekte i ad hoc karakter Luisovog pravila pažnje i tvrdim da je ono tako formulisano da bi omogućilo rešavanje skeptičkog paradoksa. Zaključujem da je Luisova teorija o tvrđenjima kojima se pripisuje znanje subjektu neodrživa u svom originalnom obliku. (shrink)

In 2017, the Australasian Journal of Philosophy issued a rare retraction, informing their readers that one of their articles was not in fact written by a cat. The short article, a critique of David Lewis’s ‘Veridical Hallucination and Prosthetic Vision’, was published in 1981 under the name of ‘Bruce Le Catt’, a figure with no discernible institutional affiliation or track record of publishing, but who appears to have been familiar with Lewis’s work. As indeed he might have been, being the (...) beloved pet of the great American philosopher. -/- It may not have come as a surprise to those familiar with Lewis’s work that ‘Bruce Le Catt’ was not the pseudonym of an astute critic, but of Lewis himself. The playfulness of Lewis’s writing is well known: for instance, the paper ‘Holes’ (1970), co-written with Stephanie Lewis, is a dialogue between two characters, ‘Argle’ and ‘Bargle’, on the ontological status of holes as found in Gruyère, crackers, paper-towel rollers and in matter more generally. Nevertheless, the attribution of the 1981 paper to a cat seemed to cross a line. It may have been playful, but it was also deceptive, hence the retraction. -/- Lewis was not the only 20th-century philosopher to publish using an invented persona. The contents page of the book Explaining Emotions (1980), edited by Amélie Oksenberg Rorty, features the essay ‘Jealousy, Attention, and Loss’ by one Leila Tov-Ruach, listed on the Contributors page as ‘an Israeli psychiatrist, who writes and lectures on philosophic psychology’. Some readers might have noticed that this is a rather unusual name – a pun on laila tov ruach or ‘goodnight wind’ in Hebrew – and might have had their suspicions confirmed by the fact that there is no discernible trace of this psychiatrist elsewhere on the medical or academic record. Indeed, as an erratum on the University of California Press website drily notes, Amélie Oksenberg Rorty and Leila Tov-Ruach are indeed one and the same person. (shrink)

This paper provides an exposition and defence of Lewis' theory of radical interpretation. The first part explains what Lewis' theory was; the second part explains what it wasn't, and in so doing addresses a number of common objections that arise as a result of widespread myths and misunderstandings about how Lewis' theory is supposed to work.

This paper explores the physical and metaphysical implications of time travel, focusing on the possibility of changing the past, through a comparative analysis of David Lewis' modal realism and Everett's many-worlds interpretation of quantum mechanics. The existence of closed timelike curves (CTCs) in certain solutions to Einstein's field equations provides a theoretical basis for the possibility of backwards time travel, but this leads to a range of paradoxes, most notably the grandfather paradox. David Lewis argues that time travel must maintain (...) consistency and that the past cannot be changed, even if time travel were possible. His view is supported by his modal realism, which posits the existence of a plurality of possible worlds. In contrast, Everett's many-worlds interpretation, which holds that quantum mechanics describes a multiverse of branching realities, might seem to allow for the possibility of multiple, inconsistent histories. By examining these two ontological frameworks, this paper aims to shed light on the paradoxes of time travel and to explore whether the many-worlds interpretation provides a more satisfactory resolution to these paradoxes than Lewis' modal realism. It is argued that while Lewis' view provides a coherent model for maintaining consistency in time travel, Everett's interpretation may offer a more physically grounded and philosophically compelling account of the metaphysics of time travel. The paper concludes by suggesting that the many-worlds interpretation, by locating the branching of timelines within the structure of quantum mechanics itself, may provide a more promising framework for understanding the possibility and implications of time travel than Lewis' modal realism. However, significant questions remain about the nature of personal identity and free will in a branching multiverse. This comparative analysis aims to contribute to the ongoing debate about the metaphysical possibility of time travel and to highlight the value of engaging with interpretations of quantum mechanics in this context. Keywords: time travel, closed timelike curves, modal realism, many-worlds interpretation, grandfather paradox, metaphysics of time. (shrink)

Autor eseju argumentuje, że podróże w czasie są możliwe, a paradoksy podróży w czasie są osobliwościami, a nie niemożliwościami. Obrona możliwości podróży w czasie wymaga przyjęcia (a) trwających w czasie rzeczy, które posiadają zarówno przestrzenne, jak i czasowe części, (b) psychologicznej ciągłości i łączności oraz ciągłości przyczynowej jako kryteriów tożsamości osobowej, a także (c) rozróżnienia pomiędzy czasem zewnętrznym i osobistym.

In voicing commitments to the principle that the adoption of artificial-intelligence (AI) tools by armed forces should be done responsibly, a growing number of states have referred to a concept of “Responsible AI.” As part of an effort to help develop the substantive contours of that concept in meaningful ways, this position paper introduces a notion of “responsible reliance.” It is submitted that this notion could help the policy conversation expand from its current relatively narrow focus on interactions between an (...) AI system and its end-user to also encompass the wider set of interdependencies involved in fulfilling legal obligations concerning the use of AI in armed conflicts. The authors argue that to respect international humanitarian law and ensure accountability, states ought to devise and maintain a framework that ensures that natural persons involved in the use an AI tool in an armed conflict could responsibly rely at least on: (1) the tool’s technical aspects, (2) the conduct of other people involved in development and use of that AI tool; and (3) the policies and processes implemented at the state level. According to the authors, the “responsible reliance” notion could serve, among other examples, as a basis on which to articulate legal requirements, prohibitions, and permissions across diverse areas, from the design of AI tools to human-machine interactions to configuration of responsible-command frameworks. (shrink)

I consider a problem for functional reductionism, based on the following tension. Say that b is functionally reduced to a. On the one hand, a and b turn out to be identical, and identity is a symmetric relation. On the other hand, functional reductionism implies that a and b are asymmetrically related: if b is functionally reduced to a, then a is not functionally reduced to b. Thus, we ask: how can a and b be asymmetrically related if they are (...) the same thing? I propose a solution to this tension, by distinguishing between ontological levels and levels of description. (shrink)

Sorensen (1992) has provided two modal-logical schemas to reconstruct the logical structure of two types of destructive thought experiments: the Necessity Refuter and the Possibility Refuter. The schemas consist of five propositions which Sorensen claims but does not prove to be inconsistent.We show that the five propositions, as presented by Sorensen, are not inconsistent, but by adding a premise (and a logical truth), we prove that the resulting sextet of premises is inconsistent. Häggqvist (2009) has provided a different modal-logical schema (...) (Counterfactual Refuter), which is equivalent to four premises, again claimed to be inconsistent. We show that this schema also is not inconsistent, for similar reasons. Again, we add another premise to achieve inconsistency. The conclusion is that all three modal-logical reconstructions of the arguments that accompany thought experiments, two by Sorensen and one by Häggqvist, have now been made rigorously correct. This may inaugurate new avenues to respond to destructive thought experiments. (shrink)

The ontological pictures underpinning David Lewis's Parts of Classes and On the Plurality of Worlds are in some tension. One tension concerns whether the sets and classes of Parts of Classes can be found in Lewis's modal space, since they cannot in general be parts of any possible world. The second is that the atoms that are the mathematical ontology of Parts of Classes seem to meet the criteria for being possible worlds themselves, and so fail to be the material (...) Parts of Classes needs. Two different responses to these tensions are discussed: one is unappealing in several ways but keeps more of Lewis's doctrines, while the other requires some modifications to the system of Parts of Classes. (shrink)

This paper brings two fresh perspectives on Lewis’s theory of time travel. First: many key aspects and theoretical desiderata of Lewis’s theory can be captured in a framework that does not commit to eternalism about time. Second: implementing aspects of Lewisian time travel in a non-eternalist framework provides theoretical resources for a better treatment of time travel to the future. While time travel to the past has been extensively analyzed, time travel to the future has been comparatively underexplored. I make (...) progress on this topic. Along the way, I discuss Lewis’s lesser-known time travel oeuvre, especially his volume of correspondence and lectures on the topic collected in Beebee and Fisher (2020) and Janssen-Lauret & MacBride (forthcoming). Lewis’s body of unpublished work on time travel yields fruitful insights into his broader thinking on the subject. (shrink)

In this paper, I develop a theory on which each of a thing’s abundant properties is immanent in that thing. On the version of the theory I will propose, universals are abundant, each instantiated universal is immanent, and each uninstantiated universal is such that it could have been instantiated, in which case it would have been immanent. After setting out the theory, I will defend it from David Lewis’s argument that such a combination of immanence and abundance is absurd. I (...) will then advocate the theory on the grounds that it accomplishes all of Lewis’s “new work” while providing a gain in parsimony and a new account of fine-grained content. I will close with a discussion of how the theory also affords a new reply to two objections to uninstantiated universals: Armstrong’s charge that they are inconsistent with naturalism, and a Benacerraf-Field-style objection about epistemic access. (shrink)

This paper offers an argument in favour of a Lewisian version of concretism that maintains both the principle of material inheritance (according to which, if all the parts of an object x are material, then x is material) and the materiality-modality link (that is, the principle that, for every x, if x is material, then x is possible).

The chapter looks at an aspect of David Lewis’s work on language that has been important for the foundation and history of formal semantics as a discipline practiced by both linguists and philosophers of language: a referential semantics over possible worlds that is connected to linguistically plausible syntactic structures. Lewis’s original contributions are placed within their historical context: Church’s typed lambda calculus, Carnapian intensions, the categorial grammars of Ajdukiewicz, and Chomsky’s theories of the relation between syntax and semantics. Relying on (...) Lewis’s letters, the chapter identifies the works of Stenius, Davidson, and Katz as triggering Lewis’s interest in formal theories of natural language semantics and clarifies the relation between his and Montague’s contributions to the foundation of the discipline. (shrink)

On the standard analysis, a counterfactual conditional such as “If P had been the case, then Q would have been the case” is true in the actual world if, in all nearest possible worlds in which its antecedent (P) is true, its consequent (Q) is also true. Despite its elegance, this analysis faces a difficulty if the laws of nature are deterministic. Then the antecedent could not have been true, given prior conditions. So, it is unclear what the relevant “nearest (...) possible worlds” are. David Lewis suggested that they are ones in which a local breach of the laws occurred: a “small miracle”. Others have suggested that they are ones in which the initial conditions were different (“backtracking”). I propose another response. It builds on the idea that the special sciences, where counterfactual reasoning is most common, operate at a higher level of description from fundamental physics, and that the world may behave indeterministically at higher levels even if it behaves deterministically at the fundamental physical one. The challenge from determinism can then be bypassed for many special-science counterfactuals. (shrink)

Functionalism is the view that being x is to play the role of x. This paper defends a functionalist account of three-dimensional entities in the context of Wave Function Realism (WFR), that can explain in detail how we can recover three-dimensional entities out of the wavefunction. In particular, the essay advocates for a novel version of WFR in terms of a functional reductionist approach in the style of David Lewis. This account entails reduction of the upper entities to the bottom (...) ones, when the latter behave appropriately. As applied to WFR, it shows how the wavefunction can turn out to be identical to three-dimensional objects, provided certain conditions. The first major goal of the paper is thus to put forward an improved and more rigorous version of WFR, which dissolves several extant issues about the theory, and can serve as a starting point for future literature on the topic. Moreover, the second major goal of the article is to take WFR as a case study to demonstrate the pros of functional reductionism, especially in the form defended here, thereby helping to bring this view back in the philosophy of science debate. The positive upshots of this paper suggest a possible application of functional reductionism also to other contexts. (shrink)

David Lewis is usually thought to reject what Quine called “Aristotelian essentialism”. The starting point of this paper is to define and explain Aristotelian essentialism and locate it in the context of the criticism that Quine made of quantified modal logic. Indeed, according to Quine, Aristotelian essentialism would be one of the consequences of accepting quantified modal logic. After having explained Lewis’s stance in the Quinean debate against quantified modal logic, this paper will deal with the question as to whether (...) Lewis accepts or rejects Aristotelian essentialism. I think there are different plausible interpretations of the essentialist thesis, and I will distinguish between three such interpretations. This distinction between different interpretations of essentialism is both interesting per se and helpful in understanding the senses in which Lewis is or is not an antiessentialist. I will say, in fact, that while it is true that Lewis rejects Aristotelian essentialism under the first two understandings of the essentialist thesis, he endorses such a thesis according to a third understanding. I will then take this to show that there is a sense in which Aristotelian essentialism survives in Lewis’s metaphysical theory. (shrink)

David Lewis rejected consequentialism in ethics. However, two aspects of his meta-ethical views make it a challenge to see how consequentialism could be resisted. Lewis endorses a maximising conception of rationality, where to be rational is to maximise value of a certain sort; he appears to think it is possible to be both rational and moral; and yet he rejects conceptions of moral action as acting to maximise moral value. The second tension in Lewis's views arises from his meta-ethics. Lewis's (...) naturalisation of morality is in terms of a naturalised account of value, including moral value. Insofar as he offers a motivational story for moral judgements, it is one that goes via a motivational connection to value. Yet his anti-consequentialism seems to commit him to rejecting a story of moral action entirely in terms of pursuit of moral value. In both cases there are things to be said about how to weave these strands of Lewis's thought together. After setting out these two apparent tensions in Lewis's thought about ethics, the paper discusses what a Lewisian could best say about these puzzles. Lewisians do have a number of plausible options for dealing with the first challenge. While there are things a Lewisian could attempt to extend Lewis's moral naturalism in a way that could deal with the second challenge, it is harder to see how to do this in a satisfying way. Attention then turns to what Lewis said in his letters on these topics: on that basis, perhaps Lewis was close to being an agent-relative consequentialist after all. (shrink)

The problem of the many seems to problematize the platitude that we can think about particular things in the world. How is it that, given how very many cat-like candidates there are, we often manage to think and talk about a particular cat? I argue that this challenge stems from an under-examined assumption about the relationship between metaphysics and intentionality. I explore and develop a way of characterizing what it is to think and talk about the world, according to which (...) an abundant ontology poses no obstacle to our ability to think and talk about particular things. (shrink)

Modal accounts of knowledge, mind, and language, as prominently defended by Lewis, leave no room for enquiry into non-contingent matters. According to Lewis, there is only one necessarily true proposition, and it is vacuously known by everyone. What, then, are we doing when we do metaphysics, which often seems to deal with non-contingent questions? Lewis never gave a satisfactory answer, or even acknowledged the problem. I explore some options. Can we understand the relevant parts of metaphysics as dealing with contingent (...) questions about our concepts? Can we understand them in terms of a hyperintensional conception of “explicit” knowledge? Both options have some promise. Ultimately, however, I don’t think they succeed at squaring Lewis’s empiricist epistemology with his metaphysical realism. (shrink)

This book uses computer modeling to investigate trends in what is published in leading philosophy journals over the last century and a half. The notable trends include the rise of realism from a fringe view to the mainstream metaphysical outlook, the increase in specialization, and the increasing depth of integration between philosophy and physical sciences. It also contains a guide to how to do similar investigations, and discussions of the strengths and weaknesses of the approach.

I explore the relationship between a prominent analysis of intrinsic properties, due to Langton and Lewis, and the phenomenon of quantum entanglement. As I argue, the analysis faces a puzzle. The full analysis classifies certain properties of entangled particles as intrinsic. But when combined with an extremely plausible assumption about duplication, the main part of the analysis classifies those properties as non-intrinsic instead. I conclude that much of Lewis’s metaphysics is in trouble: Lewis based many of his metaphysical views—his thesis (...) of Humean supervenience, for instance, and his account of recombination—on an analysis of intrinsicality which does not sit well with quantum phenomena. (shrink)

It has been argued recently that classical theism and Lewisian modal realism are incompatible theses. The most substantial argument to this effect takes the form of a trilemma. It argues that no sense can be made of God’s being a necessary being in the modal realistic picture, on pain of, among other things, modal collapse. The question of this essay is: Is that so? My goal here is to detail the reasons that have been offered in support of this contention (...) and then defend the coherence of theistic modal realism from the trilemma. I call my reply to the argument an “Anselmian-Thomistic” defense, since it appeals to resources from classical medieval philosophy, especially from Anselm and Aquinas. (shrink)

In this article, I defend Lewisian modal realism against objections arising from the possibility of ‘Island Universes’ and other similar cases. The problem comes from Lewis’ claim that possible worlds are spatio-temporally isolated. I suggest a modification of Lewisian modal realism in order to avoid this family of objections. This modification may sound quite radical since it amounts to abandoning the very notion of a possible world, but as radical as it may sound it in fact remains well in the (...) spirit of Lewis’ original view. (shrink)

Counterfactual analysis is an interesting feature of thought experiments, because it requires the imagination of alternative states of the world (see also publications by Fearon, Lebow and Stein, Reiss, and Tetlock and Belkin, who suggest the same). In historical analysis, the use of imagination is often the focus of criticisms of such counterfactual analysis. In this article, I consider three strategies for constraining imagination: making limited counterfactual changes, limiting counterfactual changes to the decisions of important figures, and using evidence to (...) restrict the scope for imagination. Given the focus of this special issue, I will relate this discussion to Lewis’s and Woodward’s analyses of counterfactuals in the philosophy of science. I show that counterfactual analysis in historical cases has some resemblance to Lewis’s and Woodward’s analyses, but that what Lewis calls “transition periods” cannot be left entirely vague, as Lewis suggests, nor can counterfactual changes be seen simply as interventions, as Woodward suggests. I propose that efforts to limit imagination in historical counterfactuals are ultimately problematic, but that imagination can nevertheless play a useful role in counterfactual analysis. (shrink)

This paper takes issue with an influential interpretationist argument for physicalism about intentionality based on the possibility of radical interpretation. The interpretationist defends the physicalist thesis that the intentional truths supervene on the physical truths by arguing that it is possible for a radical interpreter, who knows all of the physical truths, to work out the intentional truths about what an arbitrary agent believes, desires, and means without recourse to any further empirical information. One of the most compelling arguments for (...) the possibility of radical interpretation, associated most closely with David Lewis and Donald Davidson, gives a central role to decision theoretic representation theorems, which demonstrate that if an agent’s preferences satisfy certain constraints, it is possible to deduce probability and utility functions that represent her beliefs and desires. We argue that an interpretationist who wants to rely on existing representation theorems in defence of the possibility of radical interpretation faces a trilemma, each horn of which is incompatible with the possibility of radical interpretation. (shrink)

The Indeterminacy of Translation and Radical Interpretation The indeterminacy of translation is the thesis that translation, meaning, and reference are all indeterminate: there are always alternative translations of a sentence and a term, and nothing objective in the world can decide which translation is the right one. This is a skeptical conclusion because what it … Continue reading The Indeterminacy of Translation and Radical Interpretation →.

In this paper, I discuss a connection between quidditism and the Lewisian principle of recombination. I begin by reconstructing a typical characterisation of a Lewisian principle of recombination, followed by an explanation of quidditism. In the remainder, I argue that a proponent of a Lewisian principle of recombination cannot endorse quidditism without some important modifications of her view.

The David Lewis’s article concerns the issue of penal substitution in the dual context of the contemporary system of criminal law, in which punishment does not perform a compensatory function, and in the context of the Christian interpretation of Christ’s death as Atonement. It may seem that we do not believe in penal substitution, but in fact we do believe in it selectively. There are Christians who believe that Christ’s death is a payment of the debt of punishment owed by (...) the sinners, but do not believe that a murderer’s friend can serve on his behalf a death sentence. Most of us believe in penal substitution with reference to fines but not other kinds of punishment. In both cases the beliefs concerning penal substitution are clearly inconsistent. However, if selective acceptance of penal substitution is so common, perhaps it makes sense after all. (shrink)

In an unpublished speech from 1991, David Lewis told his audience that he counted ‘the metaphysician Carnap ’ amongst his historical ancestors. Here I provide a novel interpretation of the Aufbau that allows us to make sense of Lewis’s claim. Drawing upon Lewis’s correspondence, I argue it was the Carnap of the Aufbau whom Lewis read as a metaphysician, because Carnap’s appeal to the notion of founded relations in the Aufbau echoes Lewis’s own appeal to the metaphysics of natural properties. (...) I further maintain that Lewis was right to read Carnap this way and that the notion of a founded relation has a legitimate claim to be both logical and metaphysical. I also argue that Carnap’s initial response to Goodman’s puzzle about ‘grue’ relies upon a metaphysics of simple properties which also prefigures Lewis’s own response to Goodman invoking natural properties. (shrink)

Bernard Williams argues that philosophy is in some deep way akin to history. This article is a novel exploration and defense of the Williams thesis —though in a way anathema to Williams himself. The key idea is to apply a central moral from what is sometimes called the analytic philosophy of history of the 1960s to the philosophy of philosophy of today, namely, the separation of explanation and laws. I suggest that an account of causal explanation offered by David Lewis (...) may be modified to bring out the way in which this moral applies to philosophy, and so to defend the Williams thesis. I discuss in detail the consequences of the thesis for the issue of philosophical progress and note also several further implications: for the larger context of contemporary metaphilosophy, for the relation of philosophy to other subjects, and for explaining, or explaining away, the belief that success in philosophy requires a field-specific ability or brilliance. (shrink)

The life-long correspondence of David K. Lewis, one of the most influential philosophers of the twentieth century, reveals the development, breadth, and depth of his philosophy in its historical context. The first of this two volume collection of letters focuses on his contributions to metaphysics, arguably where he made his greatest impact.

Lewisian theism is the view that both traditional theism and Lewis’s modal realism are true. On Lewisian theism, God must exist in worlds in one of the following ways: God can be said to have a counterpart in each world; God can be said to exist in each world in the way that a universal can be said to exist in worlds, i.e. through transworld identity; God can be said to be a scattered individual, with a part of God existing (...) in each world; and, God can be said to exist in each world, through His existing from the standpoint of each world. In the literature, – have been rejected as viable options. I grant that and are not viable. However, I believe that and have been too hastily rejected. Herein, I develop ways to respond to objections to and, and conclude that is a viable option for Lewisian theists. (shrink)

David Lewis David Lewis is an American philosopher and one of the last generalists, in the sense that he was one of the last philosophers who contributed to the great majority of sub-fields of the discipline. He made central contributions in metaphysics, the philosophy of language, the philosophy of mind, and probabilistic and practical … Continue reading David Lewis →.

Sungho Choi has criticised Michael Strevens's counterexample to DavidLewis's final theory of "token" causation, causation as "influence." Iargue that, even if Choi's points are correct, Strevens's counterexampleremains useful in revealing a shortcoming of Lewis's theory. Thisshortcoming is that Lewis's theory does not properly account for*degrees* of causation. That is, even if Choi's points are correct,Lewis's theory does not capture an intuition we have about the*comparative* causal statuses of those events involved in Strevens'scounterexample (we might, for example, intuit that Sylvie's ball-firingis (...) *as much*/*more*/*less* a cause of the jar's shattering as/than isBruno's ball-firing). (shrink)