Using a framework of Dirac algebra, the Clifford algebra appropriate for Minkowski space-time, the formulation of classical electromagnetism including both electric and magnetic charge is explored. Employing the two-potential approach of Cabibbo and Ferrari, a Lagrangian is obtained that is dyality invariant and from which it is possible to derive by Hamilton's principle both the symmetrized Maxwell's equations and the equations of motion for both electrically and magnetically charged particles. This latter result is achieved by defining the variation of the (...) action associated with the cross terms of the interaction Lagrangian in terms of a surface integral. The surface integral has an equivalent path-integral form, showing that the contribution of the cross terms is local in nature. The form of these cross terms derives in a natural way from a Dirac algebraic formulation, and, in fact, the use of the geometric product of Dirac algebra is an essential aspect of this derivation. No kinematic restrictions are associated with the derivation, and no relationship between magnetic and electric charge evolves from the (classical) formulation. However, it is indicated that in bound states quantum mechanical considerations will lead to a version of Dirac's quantization condition. A discussion of parity violation of the generalized electromagnetic theory is given, and a new approach to the incorporation of this violation into the formalism is suggested. Possibilities for extensions are mentioned. (shrink)

A model for the structure of point-like fermions as tightly bound composite states is described. The model is based upon the premise that electromagnetism is the only fundamental interaction. The fundamental entity of the model is an object called the vorton. Vortons are semiclassical monopole configurations of electromagnetic charge and field, constructed to satisfy Maxwell's equations. Vortons carry topological charge and one unit each of two different kinds of angular momenta, and are placed in magnetically bound pair states having angular (...) momentum l=1/2. The topological charge prevents the mutual annihilation of the vorton pair. The helicity eigenstates of the vortons' intrinsic angular momenta form the basis for a set of internal quantum numbers for the pair which distinguish the different (point-like) pair states. Sixteen fourcomponent spinor states, eight leptonic and eight hadronic, are obtained. Eleven of these are identified with the quantum numbers of the experimentally known particles: e, ve, μ, vμ, τ, vτ; p, n, Λ, Λc, and b. Thus one new heavy lepton with its neutrino and three new quark states are predicted. Some possibilities for the extension of this model are discussed. (shrink)

- Poétique et Études littéraires – GALERIE – Nouvel article.

The authors use empirical research into the environmental practices of 31 manufacturing small and medium-sized enterprises (SMEs) to show that ‚business performance’ and ‚regulation’ considerations drive behaviour. They suggest that this is inevitable, given the market-based decision-making frames that permeate and dominate the industry in which manufacturing SMEs operate. Since the environment is a pillar of corporate social responsibility (CSR), the findings have important implications for CSR policy, which promotes voluntary actions predicated on a business case. It is argued that (...) this approach will not alter the behaviour of manufacturing SMEs significantly because CSR practice will be regarded as an optional and costly ‚extra’ affecting core business activity. Consequently, the use and development of existing regulatory structures, providing minimum standards for many activities covered by CSR, remains the most effective means through which the behaviour of manufacturing SMEs will be changed in the short to medium-term. Another feature of the paper is the distinction made between ‚business performance’ and the ‚business case’ argument. Business performance emphasises cost reductions and efficiency whereas the business case accentuates the benefits to shareholders of good practices as their firms become more attractive to stakeholders and society. Manufacturing SMEs␣try to improve business performance because of the pressures placed on them by market-dominated decision-making frames. These frames do not encourage manufacturing SMEs to undertake voluntary actions for the benefit of wider stakeholders and society. (shrink)

One. Hundred. Years. of. Homosexuality. I. In 1992, when the patriots among us will be celebrating the fivehundredth anniversary of the discovery of America by Christopher Columbus, our cultural historians may wish to mark the centenary of  ...

Philosophy and anthropology need to integrate their accounts of what a morality is. I identify three desiderata that an account of morality should satisfy: (1) it should recognize significant diversity and variation in the major kinds of value, (2) it should specify a set of criteria for what counts as a morality, and (3) it should indicate the basis for distinguishing between more or less justifiable moralities, or true and false moralities. I will discuss why these three desiderata are hard (...) to satisfy at the same time, and why they are controversial. Anthropologists and philosophers will differ on which ones they are inclined to reject. I argue that all three should be accepted and can be satisfied. (shrink)

In the eyes of many “classical” phenomenologists, Kantianism has seemed to invite individuals to leave the rich, complexly motivated environment of lived experience in favor of a shadowy, formal kingdom of abstract duties and rights. Yet there have been notable attempts within the phenomenological tradition to articulate a richer vision of Kantian moral consciousness and to exhibit, from a first-person perspective, the shape of mental life and the standing dispositions that befit membership in a Kantian kingdom of ends. Here I (...) offer two such competing paradigms of Kantian moral consciousness: on the one hand, the responsive, situational Kantian moral consciousness that recent commentators have reconstructed from Martin Heidegger’s work, and on the other hand, the very different, explicitly cosmopolitan Kantian moral consciousness traced in Hannah Arendt’s conception of an “enlarged mentality.” While each is arguably a legitimately Kantian view, these alternative models of moral consciousness offer considerably different spirits of Kantianism with different benefits and detriments, and each places very different cognitive and moral burdens on agents. (shrink)

David Wiggins; II*—Deliberation and Practical Reason, Proceedings of the Aristotelian Society, Volume 76, Issue 1, 1 June 1976, Pages 29–52, https://doi.org/10.

We review the major phenomena of skilled typing and propose a model for the control of the hands and fingers during typing. The model is based upon an Activation‐Trigger‐Schema system in which a hierarchical structure of schemata directs the selection of the letters to be typed and, then, controls the hand and finger movements by a cooperative, relaxation algorithm. The interactions of the patterns of activation and inhibition among the schemata determine the temporal ordering for launching the keystrokes. To account (...) for the phenomena of doubling errors, the model has only “type” schemata—no “token” schemata—with only a weak binding between the special schema that signals a doubling, and its argument. The model exists as a working computer simulation and produces an output display of the hands and fingers moving over the keyboard. It reproduces some of the major phenomena of typing, including the interkeystroke interval times, the pattern of transposition errors found in skilled typists, and doubling errors. Although the model is clearly inadequate or wrong in some of its features and assumptions, it serves as a useful first approximation for the understanding of skilled typing. (shrink)

I develop an account of how mathematized theories in physics represent physical systems, in response to the frequent claim that any such account must presuppose a non-mathematized, and usually linguistic, description of the system represented. The account I develop contains a circularity, in that representation is a mathematical relation between the models of a theory and the system as represented by some other model --- but I argue that this circularity is not vicious, in any case refers in linguistic accounts (...) of meaning and representation, and is simply a consequence of the fact that we have no unmediated, representation-independent access to the world. (shrink)

Nothing can kill a promising research program in ethics more quickly than a plausible argument to the effect that it is committed to a morally repellent consequence. It is especially troubling when a theory one favors is jeopardized in this way. I have this worry about Harry Frankfurt's theory of free will, autonomous agency and moral responsibility, for there is a very plausible argument to the effect that aspects of his view commit him to a version of the late Stoic (...) thesis that acting freely is a matter of ‘making do,’ that is, of bringing oneself to be motivated to act in accordance with the feasible, so that personal liberation can be achieved by resigning and adapting oneself to necessity. In this paper I try to determine whether the theory does in fact commit Frankfurt (and adherents like me) to this result and, if so, what can be done to prevent it. (shrink)

In _Thinking After Heidegger_, David Wood takes up the challenge posed by Heidegger - that after the end of philosophy we need to learn to _think_. But what if we read Heidegger with the same respectful irreverence that he brought to reading the Greeks, Kant, Hegel, Husserl and the others? For Wood, it is Derrida's engagements with Heidegger that set the standard here – enacting a repetition through transformation and displacement. But Wood is not content to crown the new (...) king. Instead he sets up a many-sided conversation between Heidegger, Hegel, Adorno, Nietzsche, Blanchot, Kierkegaard, Derrida and others. Derrida and deconstruction are first critically addressed and then drawn into the fundamental project of philosophical renewal, or renewal _as_ philosophy. The book begins by rewriting Heidegger's inaugural lecture, 'What is Metaphysics?' and ends with an extended analysis of the performativity of his extraordinary _Beitrage_. _Thinking after Heidegger_ will be a valuable text for scholars and students of contemporary philosophy, literature and cultural studies. (shrink)

This is the first of David Pears's acclaimed two‐volume work on the development of Wittgenstein's philosophy, covering the pre‐1929 writings. Part I of the first volume consists in a brief but eloquent overview of Wittgenstein's philosophy as a whole; Part II critically examines the earlier system, delineating and evaluating the central ideas (logical atomism, picture theory of meaning, and solipsism) with intellectual rigour and clarity. Pears succeeds in both offering an original realist interpretation of Wittgenstein's earlier thought, one that (...) has found many followers, and in demarcating a structural framework that makes the internal organization of Wittgenstein's philosophy as a whole more accessible. (shrink)

This title was first published in 2003. This book critically examines the moral and political status of the child by a consideration of three interrelated questions: What rights if any does the child have? What rights over and duties in respect of a child do parents have? What rights over and duties in respect of a child does the state have? David Archard adopts three areas for particular discussion on the practical implications of the general theoretical issues: education, child (...) protection policy, and the medical treatment of children. Providing a clear legal context and a sharper, contemporary discussion of the question of rights, this book presents a clear introduction to the key issues in the moral and political status of children. (shrink)

In “How Facts Make Law” and other recent work, Mark Greenberg argues that legal positivists cannot develop a viable constitutive account of law that meets what he calls the “the rational-relation requirement.” He argues that this gives us reason to reject positivism in favor of antipositivism. In this paper, I argue that Greenberg is wrong: positivists can in fact develop a viable constitutive account of law that meets the rational-relation requirement. I make this argument in two stages. First, I offer (...) an account of the rational-relation requirement. Second, I put forward a viable positivist account of law that I argue meets this requirement. The account that I propose is a version of Scott Shapiro’s Planning Theory of Law. The version of Shapiro’s account that I propose combines (1) the account of concepts and conceptual analysis put forward by David Chalmers and Frank Jackson with (2) the account of the concept LEGAL INSTITUTION (and its conceptual connections to the concept LEGAL NORM) that we get from a certain reading of Shapiro’s Planning Theory. In addition to providing a compelling response to Greenberg’s argument in “How Facts Make Law,” I argue that the explanation for why my response to Greenberg works underscores one of the central problems facing legal antipositivism: namely, its lack of a convincing account of the nature of legal institutions. (shrink)

There are many people who think that deconstruction has run its course, has had its day, and that it is now time to return to the important business of philosophy, or perhaps to serious ethical, social and political questions. Derrida's work, it is said, leads nowhere but a sterile philosophy of difference that in its de-politicized, de-historicized abstractness is a form of conservatism little better than the kinds of identity thinking to which it seems to be so radically opposed. In (...) short, we must go ‘beyond’ deconstruction. (shrink)

According to a widespread contention, individuals are among the basic building blocks of the world. The contention, however, raises a perennial problem. If individuals are basic, they cannot be fully accounted for in terms of their empirically detectable qualities. But then, how can we detect, or know, or identify, individuals? Shamik Dasgupta has influentially argued that considerations along these lines, together with a lesson from the history of physics, should make us reject any picture on which individuals are basic constituents (...) of reality. In this paper, I defend such a picture against Dasgupta’s argument. (shrink)

In the 1990s, Russia and Argentina both tied their currencies to the dollar to combat inflation. They later devalued under pressure, but only after an extremely costly delay, and only after an explosive spread of monetary surrogates substituting for official currency. This article explains these puzzling developments using an institutional-sociological approach to money, which relates exchange-rate preferences to financial context rather than sectoral position, as is common. It proposes a “lock-in” mechanism explaining delayed devaluation in both cases, as well as (...) Argentina’s greater delay, and explores the linkages between exchange-rate policy and the origins of monetary surrogates. (shrink)

In some logics, anything whatsoever follows from a contradiction; call these logics explosive. Paraconsistent logics are logics that are not explosive. Paraconsistent logics have a long and fruitful history, and no doubt a long and fruitful future. To give some sense of the situation, I’ll spend Section 1 exploring exactly what it takes for a logic to be paraconsistent. It will emerge that there is considerable open texture to the idea. In Section 2, I’ll give some examples of techniques for (...) developing paraconsistent logics. In Section 3, I’ll discuss what seem to me to be some promising applications of certain paraconsistent logics. In fact, however, I don’t think there’s all that much to the concept ‘paraconsistent’ itself; the collection of paraconsistent logics is far too heterogenous to be very productively dealt with under a single label. Perhaps that will emerge as we go. (shrink)

According to a certain conception of language, any sentence can, when used on an occasion, have any of indefinitely many truth-conditions. Such a conception of language gives us reason to think that the question of whether the notion of truth has a distinctive content cannot be settled by looking solely at the predication of truth. By focusing on the predicate ‘true’ when trying to determine the significance of the notion of truth, we may have been looking in the wrong place.

In its many interwoven traditions, continental philosophy has a distinctive focus on what escapes the concept—experience, change, agency, responsibility, the future, the Other. The challenges that face us in the future are many: reaffirming and renewing what has already been thought and needs repeating, responding to emergent questions. None could be more urgent than the question of the animal and the fate of the planet. Addressing each of these requires that we suspend our normal conceptual assurances and think anew.

A real but typical case of identity fraud is used to open up the complex web of identification systems in Brazil. It is argued that identification has two poles related to the nature of citizenship—repression and inclusion—and that reactions from citizens to new identification schemes can be attributed to how they view the purpose of the cards in these terms. In Brazil, a sense of inclusion and citizenship based on a fear of anonymity and exclusion predominates leading to widespread support (...) amongst even critics of state activities. However, this may be undermined by the lack of state preparation for an information society, particularly the absence of meaningful data protection laws. (shrink)

Acidophilic autotrophic thiobacilli, which are able to oxidize metal and solubilize sulphide ores, are used industrially to leach metals from mineral ores. Genetic manipulation of the thiobacilli has the potential for the production of leaching bacteria with desirable characteristics for industry. In this review we examine the development of genetic systems in the thiobacilli and the present status of molecular genetics in the group.