Quantum field theories containing massless particles are divergent not just in the ultraviolet but also in the infrared. Infrared divergences are typically regarded as less conceptually problematic than ultraviolet divergences because there is a cancellation mechanism that renders measurable physical observables such as decay rates and cross-sections infrared finite. In this article, I scrutinize the restriction to measurable physical observables that is required to arrive at infrared finite results. I argue that the restriction does not necessitate a retreat to operationalism (...) about the meaning of the theory, but it does call attention to underappreciated features of the infrared regime. (shrink)

Haag’s theorem has been interpreted as establishing that quantum field theory cannot consistently represent interacting fields. Earman and Fraser have clarified how it is possible to give mathematically consistent calculations in scattering theory despite the theorem. However, their analysis does not fully address the worry raised by the result. In particular, I argue that their approach fails to be a complete explanation of why Haag’s theorem does not undermine claims about the empirical adequacy of particular quantum field theories. I then (...) show that such empirical adequacy claims are protected from Haag’s result by the techniques that are required to obtain theoretical predictions for realistic experimental observables. I conclude by showing how Haag’s theorem is illustrative of a general tension between the foundational significance of results that can be obtained in perturbation theory and non-perturbative characterizations of the content of quantum field theory. 1 Introduction2 Haag’s Theorem and the Interaction Picture3 Earman and Fraser on the Success of Scattering Theory4 Haag’s Theorem and Empirical Adequacy5 Conclusion. (shrink)

Physical theories often characterize their observables with real number precision. Many non-fundamental theories do so needlessly: they are more precise than they need to be to capture the physical matters of fact about their observables. A natural expectation is that a truly fundamental theory will require its full precision in order to exhaustively capture all of the fundamental physical matters of fact. I argue against this expectation and I show that we do not have good reason to expect that the (...) standard of precision set by successful theories, or even by a truly fundamental theory, will match the granularity of the physical facts. (shrink)

This paper places Julian Schwinger's development of the Euclidean Green's function formalism for quantum field theory in historical context. It traces the techniques employed in the formalism back to Schwinger's work on waveguides during World War II, and his subsequent formulation of the Minkowski space Green's function formalism for quantum field theory in 1951. Particular attention is dedicated to understanding Schwinger's physical motivation for pursuing the Euclidean extension of this formalism in 1958.

Haag's theorem has been interpreted as establishing that quantum field theory cannot consistently represent interacting fields. Earman and Fraser have clarified how it is possible to give mathematically consistent calculations in scattering theory despite the theorem. However, their analysis does not fully address the worry raised by the result. In particular, I argue that their approach fails to be a complete explanation of why Haag's theorem does not undermine claims about the empirical adequacy of particular quantum field theories. I then (...) show that such empirical adequacy claims are protected from Haag's result by the techniques that are required to obtain theoretical predictions for realistic experimental observables. I conclude by showing how Haag's theorem is illustrative of a general tension between the foundational significance of results that can be obtained in perturbation theory and non-perturbative characterizations of the content of quantum field theory. (shrink)

Approaches to the interpretation of physical theories provide accounts of how physical meaning accrues to the mathematical structure of a theory. According to many standard approaches to interpretation, meaning relations are captured by maps from the mathematical structure of the theory to statements expressing its empirical content. In this article I argue that while such accounts adequately address meaning relations when exact models are available or perturbation theory converges, they do not fare as well for models that give rise to (...) divergent perturbative expansions. Since truncations of divergent perturbative expansions often play a critical role in establishing the empirical adequacy of a theory, this is a serious deficiency. I show how to augment state-space semantics, a view developed by Beth and van Fraassen, to capture perturbatively evaluated observables even in cases where perturbation theory is divergent. This new semantics establishes a sense in which the calculations that underwrite the empirical adequacy of a theory are both meaningful and true, but requires departure from the assumption that physical meaning is captured entirely by the exact models of a theory. (shrink)

The mechanisms by which most receptor protein‐tyrosine kinases (RTKs) transmit signals are now well established. Binding of ligand results in the dimerization of receptor monomers followed by transphosphorylation of tyrosine residues within the cytoplasmic domains of the receptors. This tidy picture has, however, some strange characters lurking around the edges. Cases have now been identified in which RTKs lack kinase activity, but, despite being “dead” appear to have roles in signal transduction. Even stranger are the cases in which genes encoding (...) RTKs produce protein products consisting of only a portion of the kinase domain. At least one such “fractured” RTK appears to be involved in signal transduction. Here we describe how these strange molecules might function and discuss the questions associated with their evolution. BioEssays 23:69–76, 2001. © 2001 John Wiley & Sons, Inc. (shrink)

Late in 1990, the Center for the Study of Ethics in the Professions at Illinois Institute of Technology (lIT) received a grant of more than $200,000 from the National Science Foundation to try a campus-wide approach to integrating professional ethics into its technical curriculum.! Enough has now been accomplished to draw some tentative conclusions. I am the grant's principal investigator. In this paper, I shall describe what we at lIT did, what we learned, and what others, especially philosophers, can learn (...) from us. We set out to develop an approach that others could profitably adopt. I believe that we succeeded. (shrink)

My topic is authenticity in or perhaps as painting, not the authenticity of paintings; I know next to nothing about the problem of verifying claims of authorship. I am interested in another kind of genuineness and fraudulence, the kind at issue when we say of a person that he or she is false, not genuine, inauthentic, lacks integrity, and, especially when we say he or she is playing to the crowd, playing for effect, or is a poseur. These are not (...) quite moral distinctions (no one has a duty to be authentic), but they are robustly normative appraisals, applicable even when such falseness is not a case of straight hypocrisy but of lack of self-knowledge or of self-deceit. (A person can be quite sincere and not realize the extent of her submission to the other’s expectations and demands.) This sort of appraisal also has a long history in post-Rousseauist reflections on the dangers of uniquely modern forms of social dependence, and they are prominent worries in the modern novel. (shrink)

What determines whether an action is right or wrong? Morality, Rules, and Consequences: A Critical Reader explores for students and researchers the relationship between consequentialist theory and moral rules. Most of the chapters focus on rule consequentialism or on the distinction between act and rule versions of consequentialism. Contributors, among them the leading philosophers in the discipline, suggest ways of assessing whether rule consequentialism could be a satisfactory moral theory. These essays, all of which are previously unpublished, provide students in (...) moral philosophy with essential material and ask key questions on just what the criteria for an adequate moral theory might be. (shrink)

The dual-use dilemma arises in the context of research in the biological and other sciences as a consequence of the fact that one and the same piece of scientific research sometimes has the potential to be used for bad as well as good purposes. It is an ethical dilemma since it is about promoting good in the context of the potential for also causing harm, e.g., the promotion of health in the context of providing the wherewithal for the killing of (...) innocents. It is an ethical dilemma for the researcher because of the potential actions of others, e.g., malevolent non-researchers who might steal dangerous biological agents, or make use of the original researcher’s work. And it is a dilemma for governments concerned with the security of their citizens, as well as their health. In this article we construct a taxonomy of types of “experiments of concern” in the biological sciences, and thereby map the terrain of ethical risk. We then provide a series of analyses of the ethical problems and considerations at issue in the dual-use dilemma, including the impermissibility of certain kinds of research and possible restrictions on dissemination of research results given the risks to health and security. Finally, we explore the main available institutional responses to some of the specific ethical problems posed by the dual-use dilemma in the biological sciences. (shrink)

We apply a cognitive modeling approach to the problem of measuring expertise on rank ordering problems. In these problems, people must order a set of items in terms of a given criterion (e.g., ordering American holidays through the calendar year). Using a cognitive model of behavior on this problem that allows for individual differences in knowledge, we are able to infer people's expertise directly from the rankings they provide. We show that our model-based measure of expertise outperforms self-report measures, taken (...) both before and after completing the ordering of items, in terms of correlation with the actual accuracy of the answers. These results apply to six general knowledge tasks, like ordering American holidays, and two prediction tasks, involving sporting and television competitions. Based on these results, we discuss the potential and limitations of using cognitive models in assessing expertise. (shrink)

Rule consequentialism holds that an action's moral standing depends on its relation to the moral code whose general adoption would have the best consequences. Heretofore rule consequentialists have understood the notion of a code's being generally adopted in terms of its being generally obeyed or, more commonly, its being generally accepted. I argue that these ways of understanding general adoption lead to unacceptable formulations of the theory. For instance, Brad Hooker, Michael Ridge, and Holly Smith have recently offered different (...) answers to the question of what ‘acceptance rate’ we should build into our formulation of rule consequentialism, and all are unsatisfactory. I argue instead for a novel approach to formulating rule consequentialism, ‘uniform-moral-education’ rule consequentialism, on which what it means for a moral code to be generally adopted is not for it to be generally followed or generally accepted, but instead for it to be generally taught. (shrink)

The question of whether chemical structure is reducible to Everettian Quantum Mechanics (EQM) should be of interest to philosophers of chemistry and philosophers of physics alike. Among the three realist interpretations of quantum mechanics, EQM resolves the measurement problem by claiming that measurements (now interpreted as instances of decoherence) have indeterminate outcomes absolutely speaking, but determinate outcomes relative to emergent worlds (Maudlin, 1995). Philosophers who wish to be sensitive to the practice of quantum chemistry (e.g. Scerri, 2016) should be interested (...) in EQM because Franklin and Seifert (2020) claim that resolving the measurement problem also resolves the reducibility of chemical structure, and EQM is the interpretation which involves no mathematical structure beyond that used by practicing scientists. Philosophers interested in the quantum interpretation debate should be interested in the reducibility of chemistry because chemical structure is precisely the kind of determinate three-dimensional fact which EQM should be able to ground if it is to be empirically coherent (see Allori, 2023). The prospects for reduction of chemical structure are poor if it cannot succeed in EQM; the prospects for EQM as a guide to ontology are poor if it cannot reduce chemical structure. -/- Unfortunately for proponents of chemical reduction and EQM, there are three serious barriers to the reduction of chemistry to EQM. The first concern is that quantum treatments of chemical structure rely on the Born-Oppenheimer approximation, which holds nuclear locations fixed while minimizing the energy of the electronic configuration (Hendry, 2022), but this approximation is not licensed by EQM. The Born-Oppenheimer approximation relies on nuclei and molecular orbitals being simultaneously present, but in the three-dimensional ontology following from the Everett interpretation these only emerge at different energy scales and are not simultaneously present (Miller, 2023). The second concern is that the emergent worlds of EQM are supposed to be decoherent at the macro-scale (A. Wilson, 2020), but the recent development of superchemistry suggests that chemical reactions can occur in coherent states (Zhang et al., 2023). The third concern is that emergent worlds are only pragmatic pseudo-processes (Wallace, 2012b), but this means EQM trades realist physics for mere instrumentalism about chemistry. Absent a commitment to chemical realism, reduction is an empty promise. The prospects for reduction of chemical structure to EQM are therefore poor. (shrink)

Individuals differ greatly in their ability to learn and navigate through environments. One potential source of this variation is “directional sense” or the ability to identify, maintain, and compare allocentric headings. Allocentric headings are facing directions that are fixed to the external environment, such as cardinal directions. Measures of the ability to identify and compare allocentric headings, using photographs of familiar environments, have shown significant individual and strategy differences; however, the neural basis of these differences is unclear. Forty-five college students, (...) who were highly familiar with a campus environment and ranged in self-reported sense-of-direction, underwent fMRI scans while they completed the Relative Heading task, in which they had to indicate the direction of a series of photographs of recognizable campus buildings (i.e., “target headings”) with respect to initial “orienting headings”. Large individual differences were found in accuracy and correct decision latencies, with gender, self-reported sense-of-direction, and familiarity with campus buildings all predicting task performance. Using linear mixed models, the directional relationships between headings and the experiment location also impacted performance. Structural scans revealed that lateral orbitofrontal and superior parietal volume were related to task accuracy and decision latency, respectively. Bilateral hippocampus and right presubiculum volume were related to self-reported sense-of-direction. Meanwhile, functional results revealed clusters within the superior parietal lobule, supramarginal gyrus, superior frontal gyrus, lateral orbitofrontal cortex, and caudate among others in which the intensity of activation matched the linear magnitude of the difference between the orienting and target headings. While the retrosplenial cortex and hippocampus have previously been implicated in the coding of allocentric headings, this work revealed that comparing those headings additionally involved frontal and parietal regions. These results provide insights into the neural bases of the variation within human orientation abilities, and ultimately, human navigation. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:The Journal of Aesthetic Education 39.3 (2005) 44-57 [Access article in PDF] Literary Biography: The Cinderella of Literary Studies Michael Benton There are no prizes for guessing who are the two ugly sisters: Criticism, the elder one, dominated literary studies for the first half of the twentieth century; theory, her younger sister, flounced to the fore in the second half. Meanwhile, 'Cinders,' who had been doing the chores (...) for centuries, has been magically transformed in recent times, decked out in new clothes by Richard Holmes, Claire Tomalin, Juliet Barker, Peter Ackroyd et al., and, as the millennium approached, celebrated and admired on all sides. At the start of the new century, literary biography remains in vogue. The bibliography that carries it forward is rolling, and there is no sign of it turning into a pumpkin. Why is Cinderella so popular?One obvious if superficial answer might be that literary biography is where literary people go who find the contemporary preoccupation with theory to be personally undernourishing and critically unenlightening; they would rather stay with the literary works themselves and with the lives, the minds, and the times that produced them. Yet it is not only literary biography that is thriving; life writing in general is the fastest-growing area of mainstream publishing, evidence for which can be seen in Waterstone's flagship store in London's Piccadilly, which devotes its prime ground-floor site to thousands of biographies. This commercial high profile is responding to an evident, if unfocused, need to look at other lives and understand them. Individual reasons for the popularity of biography range from prurient interest and hero worship to a, perhaps unrecognized, search for coherence and purpose in an age that is often disinclined either to accept institutional values or to respect traditional authority. The motives for this search usually include the desire for recognizable success, to which end the invention of a convincing identity is essential. Biographies offer models of how others live, face challenges, and cope with change; they are prime sites for studying ourselves. Curiously, this justification for biography as providing [End Page 44] a model for living was felt most strongly when this literary genre first emerged in the eighteenth century. The difference today is that the model has changed: Biography as a moral exemplum based upon Christian principles has been replaced in today's celebrity culture by the demand for models of success provided by public personalities. Nonetheless, whatever the range of satisfactions readers seek in biography, life writing offers, in one form or another, detailed pictures of widely different ways of living and amid these, perhaps, some clues to how an individual sense of identity might be shaped.Literary biographies (i.e., biographies of writers, not biographies with a particular literary quality) are a significant and, in some respects, a unique subgenre since they purport to offer access to the creative imagination. They have a long and distinguished history from Johnson and Boswell to the present day; they are sometimes written by other novelists (Elizabeth Gaskell on Charlotte Bronte, Peter Ackroyd on Dickens); and autobiographical writing may take the form of poetry (Wordsworth) or fiction (Joyce).1 Furthermore recent writing in this field has increasingly introduced elements of metabiography in books by Adam Sisman2 and Lucasta Miller.3 It is evident, therefore, that literary biography offers a rich and varied area of study that raises issues about the relationships among biography, history, fiction, and poetry that are fundamental to aesthetic education.Yet despite this promise, it has become a truism to declare that biography has failed to establish any theoretical foundations upon which to build. Backscheider quotes Ira Nadel's remark on the absence of "a sustained theoretical discussion of biography incorporating some of the more probing and original speculations about language, structure, and discourse that have dominated post-structuralist thought."4 She goes on to lament the poverty of criticism; the absence of a cultivated readership; the failure to engage even with the practical questions of selection, organization, or presentation; and indicates that readers of biography are too easily... (shrink)

The civic republican tradition in political thought includes Niccolo Machiavelli, Jean-Jacques Rousseau, and Alexis de Tocqueville. The belief that it is imperative that citizens participate actively and disinterestedly in public affairs, i.e., that they possess "civic virtue" or "public spirit" is a prominent family resemblance between its members. Civic republican thought has undergone a recent resurgence, and one consequence is that political philosophers and other theorists have begun to ask whether liberals can take civic virtue seriously. Certain critics of liberalism, (...) including Michael Sandel and Charles Taylor, have answered this question in the negative. They give a variety of reasons for this answer, ranging from the inability of the atomistic ontologies underlying many liberal theories to make sense of the existence of a common good to the inability of the liberal state to concern itself with the character of its citizens. ;For the most part, unsurprisingly, these antiliberals direct their arguments at the work of twentieth-century "deontological" liberals such as John Rawls and Ronald Dworkin. While Rawls and Dworkin say relatively little about civic virtue, many earlier liberals believed firmly in its importance. John Stuart Mill's centrality to the liberal tradition and the thoroughgoing nature of his liberalism make him an especially interesting "civic liberal." My central thesis is that the civic and liberal components of his political philosophy combine to form a coherent whole. In my early exegetical chapters I provide the first systematic exposition of the frequently ignored civic component. I then address the work of several of Mill's interpreters who either explicitly or implicitly point to possible problems with his attempt to weave together the civic and liberal strands in his thought, and conclude that these problems are either not real or not insoluble. Finally, I consider whether the arguments which Sandel and Taylor, et. al., have given to show that contemporary liberal theories cannot consistently incorporate the civic republican belief in the importance of active and disinterested civic participation might have force against Mill. I show that they do not, and not simply because On Liberty is not A Theory of Justice but because the many of the objections are poorly reasoned. (shrink)

Books reviewed in this article: The Bible and Postmodern Imagination: Texts Under Negotiation. By Walter Brueggemann. In the Throe of Wonder: Intimations of the Sacred in a Post‐Modern World. By Jerome A. Miller. Interpreting Hebrew Poetry. By David L. Petersen and Kent Harold Richards. Exegetical Dictionary of the New Testament, Volume I: Aαρωυ‐Eυωχ. Edited by Horst Balz and Gerhard Schneiders. The Secretary in the Letters of Paul. By E. Randolph Richards. Revelation. By Wilfrid J. Harrington. Conversion to Christianity: Historical (...) and Anthropological Perspectives on a Great Transformation. Edited by Robert W. Hefner. The Metaphor of God Incarnate. By John Hick. Disputed Questions in Theology and the Philosophy of Religion. By John Hick. The Nature of God. By Gerard J. Hughes. The Animals Issue: Moral Theoy in Practice. By Peter Carruthers. Philosophy and Theology in the Middle Ages. By G. R. Evans. Modalities in Medieval Philosophy. By Simo Knuuttila. Da Descarres a Spinoza: Percorsi della teologia razionale nel seicento. By Maria Emanuela Scribano. Tra Descartes e Bayle: Poiret e la teodicea. By Gianluca Mori. Kierkegaard and the Limits of the Ethical. By Anthony Rudd. Kierkegaard on Art and Communication. Edited by George Pattison. Collected Works of Bernard Lonergan Volume 10: Topics in Education. Edited by Robert M. Doran and Frederick E. Crowe. A Theology of Reconstruction: Nation‐building and Human Rights. By Charles Villa‐Vicencio. Religious Methods and Resources in Bioethics. Edited by Paul F. Camenisch. Theological Developments in Bioethics. Edited by Andrew Lustig et al. Marriage in the Western Church: The Christianization of Marriage During the Patristic and Early Medieval Periods. By Philip L. Reynolds. Marriage in the Early Church. Translated and edited by David G. Hunter. The Clash of Gods: A Reinterpretation of Early Christian Art. By Thomas F. Mathews. A History of Religion in Britain: Practice and Belief from Pre‐Roman Times to the Present. Edited by Sheridan Gilley and W. J. Sheik. The Conversion of Henri IV: Politics, Power and Religious Belief in Early Modern France. By Michael Wolfe. English Polemics at the Spanish Court: Joseph Creswell's ‘Letter to the Ambassador from England’, The English and the Spanish Texts of 1606. Edited by Albert J. Loomie. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:American Journal of Philology 127.2 (2006) 293-303 [Access article in PDF] Some Late Sonnets of Gildersleeve Found at Sewanee Christopher M. McDonough University of the South e-mail: [email protected] Basil Lanneau Gildersleeve, the eminent classicist who founded this journal, is remembered primarily as an authority on matters of grammar and philology; he was in addition something of a poet, although of limited ability, who specialized in sonnets.1 In the archives (...) of the University of the South in Sewanee, Tennessee, I recently found a number of sonnets written by Gildersleeve, all of them apparently from late in his long life.2 As these may be of interest to the readership of this journal, AJP's current editor has graciously allowed these nugae of her distinguished predecessor to be reprinted here.What follows below are seven sonnets written when Gildersleeve was evidently in or nearly in his nineties,3 all of which were copied in longhand by his niece, Mrs. Leon D. (Eleanor) Kirby, a longtime Sewanee resident.4 When and why Mrs. Kirby made these transcriptions is uncertain, [End Page 293] although her reasons appear to have been personal.5 She was not a practiced amanuensis (see below n. 14), and the text of the sonnets is largely as she copied them out, with only minor corrections.6 Because these require in places a little explication, I have supplied a brief commentary as well. From the appearance of his name fairly littering the footnotes, readers will ascertain that Professor Ward Briggs has been tremendously helpful to me in putting together this "Brief Mention."It was in one of his own late "Brief Mentions," in fact, that Gildersleeve outlined his theory that "the modern sonnet [is] an analogon on a large scale" to the elegiac distich (AJP 41.2 [1920]: 200 = Miller 1930, 402). As he continues, "The octave... represents the hexameter, the sextet, the pentameter, and the likeness to the latter is heightened by the use of terza rima."7 He ends his remarks on the matter thus: The Greeks kept prose and poetry steadily apart... but the elegiac distich was open to all; and I may claim Hellenic authority for introducing my sonnets into the company of grave grammarians. If that chiffonier Diogenes Laertius might try his hand on epigram, why not I try mine at sonnets? [End Page 294]In a letter to Paul Shorey, Gildersleeve had assessed his own poetic endeavors as "mere embroideries of more or less familiar texts" that are "at best... bits of versified rhetoric" (Briggs 1987, 346). On the other hand, as Shorey himself had maintained in a long New York Times tribute, "Everything that Gildersleeve did counted" (January 27, 1924, 14). No doubt the sonnets are of greater historical than literary value, although this is a judgment better perhaps left to the individual tastes of AJP's current company of grave grammarians. 1. Callimachus to Heraclitus (The Old Greek Page) They told me Heraclitus, thou wast dead. Death is the common lot, too well I know, Of every thing that lives and moves below The brazen heavens. But Ah! what tears I shed When I recalled how oft the hours sped. Unheeded they would come unheeded go While our discourse kept up its happy flow Until the sun sank to his ocean bed Long since, long since, my Halicarnassian friend [... thou hast returned to dust.] Thy play is over, and thy work is done. The angel Azrael who makes an end Of mortal men, thy tuneful voice hath hushed And yet thy Nightingales live on, sing on. 2. To Joseph Packard They told me Joseph Packard, thou wast dead Death is the common lot, too well I know, Of every thing that lives and moves below The brazen heavens. But Ah! what tears I shed, When I recalled how oft the hours sped. Unheeded they would come, unheeded go While our discourse kept up its happy flow. [Until the sun sank to his ocean bed] And now dear comrade, old Confederate friend Ashes to ashes art thou, dust to dust. The... (shrink)

These are replies to the discussions by Kirk Ludwig, Elizabeth Pacherie, Björn Petersson, Abraham Roth, and Thomas Smith of Michael E. Bratman, Shared Agency: A Planning Theory of Acting Together (Oxford University Press, 2014).

A précis of Michael E. Bratman, Shared Agency: A Planning Theory of Acting Together (Oxford University Press, 2014).

Recently several philosophers have argued that environmental reform movements cannot halt humankind’s destruction of the biosphere because they still operate within the anthropocentric humanism that forms the root of the ecological crisis. According to “radical” environmentalists, disaster can be averted only if we adopt a nonanthropocentric understanding of reality that teaches us to live harmoniouslyon the Earth. Martin Heidegger agrees that humanism leads human beings beyond their proper limits while forcing other beings beyond their limits as weIl. The doctrine of (...) the “rights of man” justifies human exploitation of nonhuman beings. Paradoxically, however, the doctrine of rights for nonhuman beings does not escape the orbit of humanism. According to Heidegger, a nonanthropocentric conception of humanity and its relation to nature must go beyond the doctrine of rights. We can dweIl harmoniously on Earth only by submitting to our primary obligation: to be open for the Being of beings. We need a new way of understanding Being, a new ethos, that lets beings manifest themselves not merely as objects for human ends, but as intrinsically important. Heidegger calls this ethos the “fourfold” of earth and sky, gods and mortals. Humanists argue that Heidegger is wrong to abandon the principle of human rights in favor of the notion that we are obligated to “let beings be,” while some radical environmentalists accuse hirn of being a humanist because he supposedly overestimates the importance of humankind’s ability to speak. Heidegger insists, however, that language makes possible culture, without which thereis no human experience of nature. An environmentally sound ethos. can arise, according to Heidegger, only from a shift within the cultural heritage of the West. Richard Rorty agrees that we must become open for a new “conversation” with the West, even if this requires abandoning traditionally important fields such as epistemology. The need to develop a new understanding of Being is so great that thinkers from the analytic and continental traditions of philosophy are finally initiating a long-overdue dialogue. (shrink)

Although computation and the science of physical systems would appear to be unrelated, there are a number of ways in which computational and physical concepts can be brought together in ways that illuminate both. This volume examines fundamental questions which connect scholars from both disciplines: is the universe a computer? Can a universal computing machine simulate every physical process? What is the source of the computational power of quantum computers? Are computational approaches to solving physical problems and paradoxes always fruitful? (...) Contributors from multiple perspectives reflecting the diversity of thought regarding these interconnections address many of the most important developments and debates within this exciting area of research. Both a reference to the state of the art and a valuable and accessible entry to interdisciplinary work, the volume will interest researchers and students working in physics, computer science, and philosophy of science and mathematics. (shrink)

Mill's discussion of ‘the internal sanction’ in chapter III of Utilitarianism does not do justice to his understanding of internal sanctions; it omits some important points and obscures others. I offer an account of this portion of his moral psychology of motivation which brings out its subtleties and complexities. I show that he recognizes the importance of internal sanctions as sources of motives to develop and perfect our characters, as well as of motives to do our duty, and I examine (...) in some detail the various ways in which these sanctions give rise to motivating desires and aversions. (shrink)

According to the Gottesman–Knill theorem, quantum algorithms that utilize only the operations belonging to a certain restricted set are efficiently simulable classically. Since some of the operations in this set generate entangled states, it is commonly concluded that entanglement is insufficient to enable quantum computers to outperform classical computers. I argue in this article that this conclusion is misleading. First, the statement of the theorem is, on reflection, already evident when we consider Bell’s and related inequalities in the context of (...) a discussion of computational machines. This, in turn, helps us to understand that the appropriate conclusion to draw from the Gottesman–Knill theorem is not that entanglement is insufficient to enable a quantum performance advantage, but rather that if we limit ourselves to the operations referred to in the Gottesman–Knill theorem, we will not have used the resources provided by an entangled quantum system to their full potential. (shrink)

We show that the existence of a recursively enumerable set whose Turing degree is neither low nor complete cannot be proven from the basic axioms of first order arithmetic (P -) together with Σ 2 -collection (BΣ 2 ). In contrast, a high (hence, not low) incomplete recursively enumerable set can be assembled by a standard application of the infinite injury priority method. Similarly, for each n, the existence of an incomplete recursively enumerable set that is neither low n nor (...) high n - 1 , while true, cannot be established in P - + BΣ n + 1 . Consequently, no bounded fragment of first order arithmetic establishes the facts that the high n and low n jump hierarchies are proper on the recursively enumerable degrees. (shrink)

Various promising claims have been made that business can help alleviate poverty, and can do so in ways that add value to the bottom line. This article begins by highlighting that the evidence for such claims is not especially strong, particularly if business is thought of as a development agent, i.e. an organization that consciously and accountably contributes towards pro-poor outcomes. It goes on to ask whether, if we did know more about either the business case or the poverty alleviation (...) case, would this give cause for greater optimism that business could make a significant contribution to development. By exploring the experiences of producers of Fairtrade tea in Kenya, we reveal the complex nature of what constitutes a beneficial outcome for the poor and marginalized, and the gap that can exist between ethical intentions and the experience of their intended beneficiaries. The lessons of these experiences are relevant for Fairtrade and any commercial initiative that seeks to achieve outcomes beneficial and recognizable to the poor, and raise questions about the integration of social and instrumental outcomes that a future generation of ethical entrepreneurship will need to address. (shrink)

This is a reply to discussions by David Copp, Tamar Schapiro, and Sergio Tenenbaum of Michael E. Bratman, Shared Agency: A Planning Theory of Acting Together.