In theTractatus, Wittgenstein advocates two major notational innovations in logic. First, identity is to be expressed by identity of the sign only, not by a sign for identity. Secondly, only one logical operator, called “N” by Wittgenstein, should be employed in the construction of compound formulas. We show that, despite claims to the contrary in the literature, both of these proposals can be realized, severally and jointly, in expressively complete systems of first-order logic. Building on early work of Hintikka’s, we (...) identify three ways in which the first notational convention can be implemented, show that two of these are compatible with the text of theTractatus, and argue on systematic and historical grounds, adducing posthumous work of Ramsey’s, for one of these as Wittgenstein’s envisaged method. With respect to the second Tractarian proposal, we discuss how Wittgenstein distinguished between general and non-general propositions and argue that, claims to the contrary notwithstanding, an expressively adequate N-operator notation is implicit in theTractatuswhen taken in its intellectual environment. We finally introduce a variety of sound and complete tableau calculi for first-order logics formulated in a Wittgensteinian notation. The first of these is based on the contemporary notion of logical truth as truth in all structures. The others take into account the Tractarian notion of logical truth as truth in all structures over one fixed universe of objects. Here the appropriate tableau rules depend on whether this universe is infinite or finite in size, and in the latter case on its exact finite cardinality.As it is obviously easy to express how propositions can be constructed by means of this operation and how propositions are not to be constructed by means of it, this must be capable of exact expression.5.503. (shrink)

We present a theory of conversation comprehension in which a line of the conversation is “understood” by relating it to one of seven possible “points”. We define these points, and present examples where it seems plausible that the failure to “get the point” would indeed constitute a failure to understand the conversation. We argue that the recognition of such points must proceed in both a top down and bottom up fashion, and thus is likely to be quite complicated. Finally, we (...) see the processing of information in the conversation to be dependent upon which point classification the user decides upon. (shrink)

In his work, Being Given, Jean-Luc Marion calls for a phenomenological investigation of the givenness (donation) of the phenomenon. As a phenomenologist of religion, Marion aims to give a philosophical account of the possibility of revelation, something which by definition is unconditionally given. In Being Given, he contends that his phenomenological reduction to unconditional givenness (in the figure of the saturated phenomenon) can account for religious phenomena in a way that respects the subject matter, all the while remaining philosophically neutral. (...) In this paper I argue that Marion's aim to maintain strict philosophical neutrality interferes with his attempt to respect the subject matter of his own investigation, i.e., the givenness of revelation, since revelation is recognizably given, even as possibility, only in the non-neutral context of an interpretive tradition. I establish the latter claim with recourse to Heidegger's early hermeneutic sketches of ‘primordial Christian religiosity.’ In turn, I call for a phenomenological Destruktion of Marion's work in order to release its potential as a non-neutral investigation of a distinctively Catholic religiosity. (shrink)

Hermeneutics in the twentieth century opened the way for thought of history and time in terms of the very emergence of meaning or the “interpretation” of being as such. Referring to Heidegger and his successors, this chapter contends that the themes of historicity and temporality grant philosophical access to truth and universality in experience without the demand for an “objective” view of things‐in‐themselves or of the very conditions of rationality and human agency. It begins with a reflection on Heidegger's radical (...) appropriation of the older hermeneutic tradition. The chapter also argues that the core themes of hermeneutics, historicity and temporality, open the way for rethinking our relation to truth and universality. Finally, the chapter highlights that while hermeneutics discloses the irreducibly historical and temporal nature of our existential situation as finite human beings without the idea of an independent and objectively certain relation to reality. (shrink)

What is an “illusion”? I would like to argue that there is no coherent and meaningful definition of the word “illusion” and the majority of the things we have previously labelled as “illusions” can be better categorised into three classes of perceptual effects: those that should not be regarded as illusory according to any definition; those that are simply consequences of “how our perceptual systems work” and those that are a consequence of using artificial or impoverished stimulus situations.

The Oxford Handbook of the Economics of Networks represents the frontier of research into how and why networks they form, how they influence behavior, how they help govern outcomes in an interactive world, and how they shape collective decision making, opinion formation, and diffusion dynamics. From a methodological perspective, the contributors to this volume devote attention to theory, field experiments, laboratory experiments, and econometrics. Theoretical work in network formation, games played on networks, repeated games, and the interaction between linking and (...) behavior is synthesized. A number of chapters are devoted to studying social process mediated by networks. Topics here include opinion formation, diffusion of information and disease, and learning. There are also chapters devoted to financial contagion and systemic risk, motivated in part by the recent financial crises. Another section discusses communities, with applications including social trust, favor exchange, and social collateral; the importance of communities for migration patterns; and the role that networks and communities play in the labor market. A prominent role of networks, from an economic perspective, is that they mediate trade. Several chapters cover bilateral trade in networks, strategic intermediation, and the role of networks in international trade. Contributions discuss as well the role of networks for organizations. On the one hand, one chapter discusses the role of networks for the performance of organizations, while two other chapters discuss managing networks of consumers and pricing in the presence of network-based spillovers. Finally, the authors discuss the internet as a network with attention to the issue of net neutrality. (shrink)

This edition of G. E. Moore's notes taken at Wittgenstein's seminal Cambridge lectures in the early 1930s provides, for the first time, an almost verbatim record of those classes. The presentation of the notes is both accessible and faithful to their original manuscripts, and a comprehensive introduction and synoptic table of contents provide the reader with essential contextual information and summaries of the topics in each lecture. The lectures form an excellent introduction to Wittgenstein's middle-period thought, covering a broad range (...) of philosophical topics, ranging from core questions in the philosophy of language, mind, logic, and mathematics, to illuminating discussions of subjects on which Wittgenstein says very little elsewhere, including ethics, religion, aesthetics, psychoanalysis, and anthropology. The volume also includes a 1932 essay by Moore critiquing Wittgenstein's conception of grammar, together with Wittgenstein's response. A companion website offers access to images of the entire set of source manuscripts. (shrink)

IntroductionThis study aimed to explore the mental wellbeing profiles and their related factors among urban young adults in Vietnam.MethodsA cross-sectional study was conducted in Hanoi, which is the capital of Vietnam. There were 356 Vietnamese who completed the Mental Health Inventory-5 questionnaire. The Latent Profile Analysis was used to identify the subgroups of mental wellbeing through five items of the MHI-5 scale as the continuous variable. Multinomial logistic regression was used to determine factors related to subgroups.ResultsThree classes represented three levels (...) of MHI-5 score, which included “Poor mental health,” “Fair mental health,” and “Good mental health,” were, respectively, 14.3, 46.6, and 39.0%. Compared to a low household economy, participants with an average household economy had 2.11 and 4.79 times higher odds of being in a good mental health class relative to fair and poor mental health classes. Respondents with more than two acute symptoms had 3.85 times higher odds of being in a good mental health class relative to a poor mental health class, as compared to those without acute symptoms. Regarding the measurement of the Perceived Social Support Scale, people having support from their family had 1.80 and 2.23 times higher odds of being in classes of fair and good mental health relative to the poor mental health class; and participants having friend support also had 1.87 times higher odds of being in a good mental health class compared with the fair mental health class, as the MSPSS score increased by 1 unit. People with Rosenberg’s self-esteem scale increased by 1 score, those who had 1.17, 1.26, and 1.47 times higher odds of being in a good compared to fair mental health class, fair compared to poor mental health class, and good compared to poor mental health class, respectively.ConclusionOur findings were given to promote a new classification method for mental health screening among the general population. The current findings could be used as evidence to develop policies and plans that focus on encouraging early screening for mental health problems among the general young population in the future. (shrink)

O'Connor and Wyatt use more than 250 color photographs and illustrations to help us break out of the linear mode and see the world differently.

Wittgenstein’s writings and lectures during the first half of the 1930s play a crucial role in any interpretation of the relationship between the Tractatus and the Philosophical Investigations . G. E. Moore’s notes of Wittgenstein’s Cambridge lectures, 1930-1933, offer us a remarkably careful and conscientious record of what Wittgenstein said at the time, and are much more detailed and reliable than previously published notes from those lectures. The co-authors are currently editing these notes of Wittgenstein’s lectures for a book to (...) be published by Cambridge University Press. We describe the materials that make up Moore’s notes, explain their unique value, review the principal editorial challenges that these materials present, and provide a brief outline of our editorial project. (shrink)

I defend origins of life research against an argument, given by Roger White in 2007, that it rests on a mistake. I show how the Bayesian machinery can illuminate the rational search for alternative explanations of currently inexplicable, improbable data, and in particular how it can illuminate the rational search for a secular explanation of the origins of life and of the fine-tuning of the universe.

Some philosophers, such as Roger Crisp and Alastair Norcross, have recently argued that the traditional moral categories of wrongness, permissibility and obligation should be avoided when doing ethical theory. I argue that even if morality does not itself provide reasons for action, the moral categories nevertheless have a central role to play in ethical theory: they allow us to make crucial judgements about how to feel about, and react to, agents who behave in anti‐social ways, and they help motivate us (...) to act altruistically. (shrink)

I rebut four claims made in a recent article by Katherin Rogers. En route I discuss how a timeless God might perceive all of “tensed” time at once.

Back in thirteenth-century Europe, in the early years of the great universities, learning was spiced with the danger of mob violence and a terrifyingly repressive religious censorship. Roger Bacon, a humble and devout English friar, seems an unlikely figure to challenge the orthodoxy of his day - yet he risked his life to establish the basis for true knowledge. Born c.1220, Bacon was passionately interested in the natural world and how things worked. Such dangerous topics were vetoed by his Order, (...) and it was only when a new Pope proved sympathetic that he began compiling his encyclopaedia on everything from optics to alchemy - the synopsis took a year and ran to 800,000 words and he was never to complete the work itself. Sadly, the enlightened Pope died, and Bacon was tried as a magician and incarcerated for ten years. Legend transformed Bacon into a sorcerer, 'Doctor Mirabilis', yet he taught that all magic was based on fraud, and his books were the first flowering of the scientific thinking that would transform our world. He advanced the understanding of optics, made geographical breakthroughs later used by Columbus, predicted everything from horseless carriages to the telescope, and stressed the importance of mathematics to science, a significance ignored for 400 years. His biggest contribution was to insist that a study of the natural world by observation and exact measurement was the surest foundation for truth. Clegg uncovers the realities of life in a medieval university and friary, setting out the shadowy facts of Bacon's life alongside his writings. The result is both a fascinating biography and a picture of the age. (shrink)

James L. Anderson analyzed the novelty of Einstein's theory of gravity as its lack of "absolute objects." Michael Friedman's related work has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein's theory. Using the Rosen-Sorkin Lagrange multiplier trick, I complete Anna Maidens's argument that the problem is not solved by prohibiting variation of absolute objects in an action principle. Recalling Anderson's proscription of "irrelevant" variables, I (...) generalize that proscription to locally irrelevant variables that do no work in some places in some models. This move vindicates Friedman's intuitions and removes the Jones-Geroch counterexample: some regions of some models of gravity with dust are dust-free and so naturally lack a timelike 4-velocity, so diffeomorphic equivalence to is spoiled. Torretti's example involving constant curvature spaces is shown to have an absolute object on Anderson's analysis, viz., the conformal spatial metric density. The previously neglected threat of an absolute object from an orthonormal tetrad used for coupling spinors to gravity appears resolvable by eliminating irrelevant fields. However, given Anderson's definition, GTR itself has an absolute object : a change of variables to a conformal metric density and a scalar density shows that the latter is absolute. (shrink)

James L. Anderson analyzed the novelty of Einstein's theory of gravity as its lack of "absolute objects." Michael Friedman's related work has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein's theory. Using the Rosen-Sorkin Lagrange multiplier trick, I complete Anna Maidens's argument that the problem is not solved by prohibiting variation of absolute objects in an action principle. Recalling Anderson's proscription of "irrelevant" variables, I (...) generalize that proscription to locally irrelevant variables that do no work in some places in some models. This move vindicates Friedman's intuitions and removes the Jones-Geroch counterexample: some regions of some models of gravity with dust are dust-free and so naturally lack a timelike 4-velocity, so diffeomorphic equivalence to is spoiled. Torretti's example involving constant curvature spaces is shown to have an absolute object on Anderson's analysis, viz., the conformal spatial metric density. The previously neglected threat of an absolute object from an orthonormal tetrad used for coupling spinors to gravity appears resolvable by eliminating irrelevant fields. However, given Anderson's definition, GTR itself has an absolute object : a change of variables to a conformal metric density and a scalar density shows that the latter is absolute. (shrink)

The sections of Wittgenstein's Philosophical Investigations which contain the Private Language (PL) Argument are dense, cryptic and wide ranging. I argue that a specific argument against a private language can be distilled from the text that is less involved and obscure than is often supposed in the immense secondary literature. It is also far less self-contained and isolated from the mainstream of philosophy than many make out, including Brian Garrettand Michael Ming Yang in recent papers in this journal. It (...) can be distinguished from arguments about rule-following, pain and the problem of other minds, forms of life, etc. and, as I have framed it, avoids Garrett's objections. Moreover, a number of would-be conclusions Garrett takes its proponents to draw from the argument, far from depending on it, are long standing positions, on some of which the PL Argument itself depends. (shrink)

James L. Anderson analyzed the novelty of Einstein's theory of gravity as its lack of "absolute objects." Michael Friedman's related work has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein's theory. Using the Rosen-Sorkin Lagrange multiplier trick, I complete Anna Maidens's argument that the problem is not solved by prohibiting variation of absolute objects in an action principle. Recalling Anderson's proscription of "irrelevant" variables, I (...) generalize that proscription to locally irrelevant variables that do no work in some places in some models. This move vindicates Friedman's intuitions and removes the Jones-Geroch counterexample: some regions of some models of gravity with dust are dust-free and so naturally lack a timelike 4-velocity, so diffeomorphic equivalence to (1,0,0,0) is spoiled. Torretti's example involving constant curvature spaces is shown to have an absolute object on Anderson's analysis, viz., the conformal spatial metric density. The previously neglected threat of an absolute object from an orthonormal tetrad used for coupling spinors to gravity appears resolvable by eliminating irrelevant fields. However, given Anderson's definition, GTR itself has an absolute object (as Robert Geroch has observed recently): a change of variables to a conformal metric density and a scalar density shows that the latter is absolute. (shrink)

In 1981 Eleonore Stump and Norman Kretzmann published a landmark article aimed at exploring the classical concept of divine eternity. 1 Taking Boethius as the primary spokesman for the traditional view, they analyse God's eternity as timeless yet as possessing duration. More recently Brian Leftow has seconded Stump and Kretzmann's interpretation of the medieval position and attempted to defend the notion of a durational eternity as a useful way of expressing the sort of life God leads. 2 However, there (...) are good reasons to reject the idea that divine timelessness should be thought of as having duration. The medievals probably did not accept it, as it contradicts a principle of classical metaphysics even more fundamental than the atemporality of the divine. In any case, it is not possible to express the notion of durational eternity in even a minimally coherent way, and the attempt to salvage the concept by appealing to the Thomistic doctrine of analogy is unsuccessful. The best analogy for God's eternity is still the one proposed by Augustine at the end of the fourth century. God lives in a timeless ‘present’, unextended like our temporal present, but immutable and encompassing all time. (shrink)

Against my interpretation, Brian Leftow argues that Anselm of Canterbury held a presentist theory of time, and that presentism can be reconciled with Anselm’s commitments concerning divine omnipotence and omniscience. I respond, focusing mainly on two issues. First, it is difficult to understand the presentist theory which Leftow attributes to Anselm. I articulate my puzzlement in a way that I hope moves the discussion forward. Second, Leftow’s examples to demonstrate that presentism can be reconciled with Anselm’s understanding of the (...) divine nature assume a mode of divine knowing which is different from what Anselm proposes. I stand by my interpretation. (shrink)

Against my interpretation, Brian Leftow argues that Anselm of Canterbury held a presentist theory of time, and that presentism can be reconciled with Anselm’s commitments concerning divine omnipotence and omniscience. I respond, focusing mainly on two issues. First, it is difficult to understand the presentist theory which Leftow attributes to Anselm. I articulate my puzzlement in a way that I hope moves the discussion forward. Second, Leftow’s examples to demonstrate that presentism can be reconciled with Anselm’s understanding of the (...) divine nature assume a mode of divine knowing which is different from what Anselm proposes. I stand by my interpretation. (shrink)

James L. Anderson analyzed the conceptual novelty of Einstein's theory of gravity as its lack of ``absolute objects.'' Michael Friedman's related concept of absolute objects has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein's theory. Using Nathan Rosen's action principle, I complete Anna Maidens's argument that the Jones-Geroch problem is not solved by requiring that absolute objects not be varied. Recalling Anderson's proscription of (globally) (...) ``irrelevant'' variables that do no work (anywhere in any model), I generalize that proscription to locally irrelevant variables that do no work in some places in some models. This move vindicates Friedman's intuitions and removes the Jones-Geroch counterexample: some regions of some models of gravity with dust are dust-free, and there is no good reason to have a timelike dust 4-velocity vector there. Eliminating the irrelevant timelike vctors keeps the dust 4-velocity from counting as absolute by spoiling its neighborhood-by-neighborhood diffeomorphic equivalence to (1,0,0,0). A more fundamental Gerochian timelike vector field presents itself in gravity with spinors in the standard orthonormal tetrad formalism, though eliminating irrelevant fields might solve this problem as well. (shrink)

This review essay introduces Brian Treanor’s Melancholic Joy in dialogue with themes in Nietzsche’s thought. The book invites this comparison in its penultimate section, which distinguishes briefly its own account from the tenets of Dionysiac pessimism. Finding that section fertile, but tantalizingly short, I parse in greater detail relevant points of convergence and divergence. The first section, “After Nietzsche,” follows Nietzsche’s development out of the first naïveté of ascetic idealism and into the wanderer’s night of biting suspicion. It likens (...) Nietzsche’s leonine eschewal of metaphysics and morals to Treanor’s sober engagement with the fruits of the physics and philosophy that have ripened in between. The second section, “Second Innocence,” contrasts Nietzsche’s vision of childlike innocence after nihilism, a renaissance beyond good and evil, with Treanor’s vital response to an updated nihilism: a love of world that refuses to deny the many realities of evil, and that responds by embracing the many mundane realities of joy. (shrink)

Wittgenstein: Lectures, Cambridge 1930–1933, From the Notes of G. E. Moore, edited by SternDavid G, RogersBrian, and CitronGabriel. Cambridge: Cambridge University Press, 2016. Pp. lxxiv + 420.