Abstract: I advocate Time-Slice Rationality, the thesis that the relationship between two time-slices of the same person is not importantly different, for purposes of rational evaluation, from the relationship between time-slices of distinct persons. The locus of rationality, so to speak, is the time-slice rather than the temporally extended agent. This claim is motivated by consideration of puzzle cases for personal identity over time and by a very moderate form of internalism about rationality. Time-Slice Rationality conflicts with two proposed principles of rationality, Conditionalization and Reflection. Conditionalization is a diachronic norm saying how your current degrees of belief should fit with your old ones, while Reflection is a norm enjoining you to defer to the degrees of belief that you expect to have in the future. But they are independently problematic and should be replaced by improved, time-slice-centric principles. Conditionalization should be replaced by a synchronic norm saying what degrees of belief you ought to have given your current evidence and Reflection should be replaced by a norm which instructs you to defer to the degrees of belief of agents you take to be experts. These replacement principles do all the work that the old principles were supposed to do while avoiding their problems. In this way, Time-Slice Rationality puts the theory of rationality on firmer foundations and yields better norms than alternative, non-time-slice-centric approaches.

Abstract: Recent work on Natural Kind Essentialism has taken a deflationary turn. The assumptions about the grounds of essentialist truths concerning natural kinds familiar from the Kripke-Putnam framework are now considered questionable. The source of the problem, however, has not been sufficiently explicated. The paper focuses on the Twin Earth scenario, and it will be demonstrated that the essentialist principle at its core (which I call IDENT) — that necessarily, a sample of a chemical substance, A, is of the same kind as another sample, B, if and only if A and B have the same microstructure — must be re-evaluated. The Twin Earth scenario also assumes the falsity of another essentialist principle (which I call INST): necessarily, there is a 1:1 correlation between (all of ) the chemical properties of a chemical substance and the microstructure of that substance. This assumption will be questioned, and it will be argued that, in fact, the best strategy for defending IDENT is to establish INST. The prospects for Natural Kind Essentialism and microstructural essentialism regarding chemical substances will be assessed with reference to recent work in the philosophy of chemistry. Finally, a weakened form of INST will be presented.

Abstract: Between 1937 and 1951 Wittgenstein had numerous philosophical conversations with his student and close friend, Rush Rhees. This article is composed of Rhees’s notes of twenty such conversations — namely, all those which have not yet been published — as well as some supplements from Rhees’s correspondence and miscellaneous notes. The principal value of the notes collected here is that they fill some interesting and important gaps in Wittgenstein’s corpus. Thus, firstly, the notes touch on a wide range of subjects, a number of which are only briefly addressed by Wittgenstein elsewhere, if at all. The subjects discussed include: explanation, ethics, anarchism, contradiction, psychoanalysis, colour, religion, concepts, classification, seeing-as, evolution, the relation between science and philosophy, and free will, amongst others. Secondly, the notes contain references to, and brief remarks about, philosophers of whom Wittgenstein otherwise says very little, if anything — such as Brentano, Heidegger, Aquinas, and Marx, amongst others. And thirdly, the notes provide us with valuable examples of Wittgenstein’s use of some key ‘Wittgensteinian’ terms of art which are surprisingly rare in his written works, such as ‘surface-’ and ‘depth-grammar’, and ‘centres of variation’.

Abstract: I articulate and defend a necessary and sufficient condition for predication. The condition is that a term or term-occurrence stands in the relation of ascription to its designatum, ascription being a fundamental semantic relation that differs from reference. This view has dramatically different semantic consequences from its alternatives. After outlining the alternatives, I draw out these consequences and show how they favour the ascription view. I then develop the view and elicit a number of its virtues.

Abstract: I propose an anti-realist account of truth and paradox according to which the logico-semantic paradoxes are not genuine inconsistencies. The �global� proofs of absurdity associated with these paradoxes cannot be brought into normal form. The account combines epistemicism about truth with a proof-theoretic diagnosis of paradoxicality. The aim is to combine a substantive philosophical account of truth with a more rigorous and technical diagnosis of the source of paradox for further consideration by logicians. Core Logic plays a central role in the account on offer. It is shown that the account is not prey to the problem of revenge paradox.

Abstract: In this paper we distinguish two competing conceptions of dignity, one recognizably Hobbesian and one recognizably Kantian We provide a formal model of how decision-makers committed to these conceptions of dignity might reason when engaged in an economic transaction that is not inherently insulting, but in which it is possible for the dignity of the agent to be called into question This is a modified version of the ultimatum game We then use this model to illustrate ways in which the Kantian evaluative standpoint enjoys a kind of internal stability that the Hobbesian framework lacks Our interpersonal argument shows that, under certain conditions, Hobbesians prefer to cultivate Kantian commitments in others and promote the presence of Kantians in the population Our intrapersonal argument shows that agents who are conflicted between Kantian and Hobbesian commitments have powerful reasons not to resolve this commitment in favour of Hobbesian values Our emulation argument illustrates that in repeated versions of the ultimatum game, the Hobbesian chooses to behave like a Kantian, including publicly repudiating her Hobbesian commitments Here again, however, the Hobbesian is able to achieve a desired benefit only on the condition that there are genuine Kantians in the population Finally, our social planning argument explores the reasons why a community of Hobbesians would opt to enshrine a Kantian conception of dignity into law The paper concludes with some remarks about the policy implications of this work The value or worth of a man is, as for all other things, his price, that is to say, so much as would be given for the use of his power; and therefore is not absolute, but a thing dependent on the need and judgement of another � The public worth of a man, which is the value set on him by the Common-wealth, is that which men commonly call DIGNITY Hobbes, Leviathan X, 16

Abstract: Many philosophers have discussed the ability of thinkers to think thoughts that the thinker cannot justify because the thoughts involve concepts that the thinker incompletely understands. A standard example of this phenomenon involves the concept of the derivative in the early days of the calculus: Newton and Leibniz incompletely understood the derivative concept and, hence, as Berkeley noted, they could not justify their thoughts involving it. Later, Weierstrass justified their thoughts by giving a correct explication of the derivative concept. This paper discusses various accounts of how a thinker manages to think with a concept that they incompletely understand and finds them wanting in the case at hand. Part of the overlooked complexity is that there are many derivative concepts, and it is unclear in virtue of what a thinker would be thinking with one of them rather than another. After critical evaluation of standard accounts, this paper suggests a novel account of how one should think about the derivative concepts with which Newton and Leibniz thought and how Weierstrass could have managed to justify their thoughts even if their thoughts did not involve the same derivative concept as Weierstrass’s

Abstract: Two main methods for analysing de re readings of definite descriptions in intensional contexts coexist: that of evaluating the description in the actual world, whether by means of scope, actuality operators, or non-local world binding, and that of substituting another description, usually one expressing a salient or ‘vivid’ acquaintance relation to an attitude holder, prior to evaluation. Recent work on so-called descriptive indexicals suggests that contrary to common assumptions, both methods are needed, for different ends. This paper aims to show that there is indeed a division of labour between the two methods of analysis and to identify criteria for choosing among alternative ways to model the second, substitutional method

Abstract: According to Frege, neither demonstratives nor indexicals are singular terms; only a demonstrative (indexical) together with ‘circumstances accompanying its utterance’ has sense and singular reference. While this view seems defensible for demonstratives, where demonstrations serve as non-verbal signs, indexicals, especially pure indexicals like ‘I’, ‘here’, and ‘now’, seem not to be in need of completion by circumstances of utterance. In this paper I argue on the basis of independent reasons that indexicals are in fact in need of completion; I identify the completers as uses of circumstances of utterance by the speaker; and I show how these uses together with the utterance of indexical sentences express thoughts. The starting point of the paper is a criticism of Kripke’s and Kunne’s alternative treatment of indexicals in Frege’s framework.

Abstract: The Humean argument concerning miracles says that one should always think it more likely that anyone who testifies to a miracle is lying or deluded than that the alleged miracle actually occurred, and so should always reject any single report of it. A longstanding and widely accepted objection is that even if this is right, the concurring and non-collusive testimony of many witnesses should make it rational to believe in whatever miracle they all report. I argue that on the contrary, even multiple reports from non-collusive witnesses lack the sort of independence that could make trouble for Hume.

Abstract: In a recent article in this journal, Alan Thomas presents a novel defence of what I call ‘Rawlsian Institutionalism about Justice’ against G. A. Cohen’s well-known critique. In this response I aim to defend Cohen’s rejection of Institutionalism against Thomas’s arguments. In part this defence requires clarifying precisely what is at issue between Institutionalists and their opponents. My primary focus, however, is on Thomas’s critical discussion of Cohen’s endorsement of an ethical prerogative, as well as his appeal to the institutional framework of a ‘property-owning democracy’ in his elaboration of the precise institutional requirements of Rawlsian Institutionalist justice, and his related claim that Cohen’s rejection of Institutionalism involves an objectionable ‘double counting’ of the demands of justice. I argue that once we are clear about both the kind of justification that can be given for a prerogative within a plausible ethical theory, and about the key points of departure between Institutionalist views and their rivals, Cohen’s rejection of Institutionalism appears well-motivated, and Thomas’s claim that his view is guilty of double counting the demands of justice can be seen to be mistaken

Abstract: There are two paradoxes of satisfaction, and they are of different kinds. The classic satisfaction paradox is a version of Grelling’s: does ‘does not satisfy itself’ satisfy itself? The Unsatisfied paradox finds a predicate, P, such that Px if and only if x does not satisfy that predicate: paradox results for any x. The two are intuitively different as their predicates have different paradoxical extensions. Analysis reduces each paradoxical argument to differing rule sets, wherein their respective pathologies lie. Having different pathologies, they are paradoxes of different kinds. Furthermore, each of these satisfaction paradoxes has an analogue with the same pathology in set theory. Therefore, these analogues are respectively of the same two kinds. This level of abstraction is significant in that it tracks two related but different pathologies. Thus, not all paradoxes of semantics and set theory share the same pathology: there are at least two kinds of paradox cutting across the semantic and set-theoretic distinction.

Abstract: In April 1939, G. E. Moore read a paper to the Cambridge University Moral Science Club entitled ‘Certainty’. In it, amongst other things, Moore made the claims that: (i) the phrase ‘it is certain’ could be used with sense-experience-statements, such as ‘I have a pain’, to make statements such as ‘It is certain that I have a pain’; and that (ii) sense-experience-statements can be said to be certain in the same sense as some material-thing-statements can be — namely in the sense that they can be safely counted on. When Moore later read his paper to Wittgenstein, Wittgenstein took violent exception to it, and the two entered into a heated exchange. The only known notes of this exchange are a previously unpublished verbatim record of part of it, taken by Norman Malcolm. This paper is an edition of Malcolm’s notes. These notes are valuable for both philosophical and scholarly reasons. They give us a glimpse of a sustained exchange between Wittgenstein and a real-life interlocutor; they contain a defence by Wittgenstein of the idea that a word’s use can illuminate its meaning; and they provide evidence of Wittgenstein’s philosophical engagement with the topic of certainty, and with Moore’s thought on it, long before he began to write the notes which make up On Certainty, in 1949.

Abstract: The categorical imperative can be construed as a universalization test for moral permissibility. False negatives of the categorical imperative would be maxims failing this test, despite the permissibility of their actions; maxims like: ‘I’ll withdraw all my savings on April 15th’. Examples of purported false negatives familiar from the literature can be grouped into three general categories, and dispatched by applying category-specific methods for proper formulation of their maxims, or for proper testing. Methods for reformulating failing maxims, such as the addition of appropriate conditional clauses, do not generate false-positive counterexamples in other instances.

Abstract: I develop a class of counterexamples to Blome-Tillmann’s ‘Presuppositional Epistemic Contextualism’ (PEC). There are cases in which subjects are ignorant of key propositions that are inconsistent with the pragmatic presuppositions in conversational contexts in which they are discussed; in such contexts, PEC wrongly predicts the subjects to satisfy certain ‘knows’ attributions

Abstract: Zombies are unconscious objects with conscious physical micro-duplicates If zombies are possible then physicalism (the thesis that the physical determines the mental) is false It has been argued that zombies are possible if conceivable for an agent with ideal rationality At any rate, they are possible only if so conceivable This essay uses a mereological constraint to highlight the fine-grained differences between actually conscious physical objects and certain of their actually consciousness-incapable proper parts These mereological considerations form the basis of an argument by dilemma that zombies are inconceivable Either an arbitrary actually conscious object might have had simpler consciousness-capable parts (and more complex consciousness-incapable parts) than it in fact has, or not The affirmative horn leads to a version of panpsychism that is inconsistent with the ideal conceivability of zombies The negative horn rules out zombies as incoherent The upshot is a new reason to deny the conceivability of zombies