Quantum entanglement has been focus of fundamental debate since the original paper of Einstein, Podolsky and Rosen [1] and the work of Bell [2], discussing its implications on fundamental issues related to the concepts of physical reality and locality. It has only been during the last few years when it has been recognized that this feature of Quantum Mechanics may also have important applications in the fields of communication and computation. In particular, it has been shown that using entanglement would (...) allow to perform certain computational tasks, such as factoring, much faster. On the other hand, it provides the basis for provably secure secret communication and cryptography. (shrink)

John Bell showed that a big class of local hidden-variable models stands in conflict with quantum mechanics and experiment. Recently, there were suggestions that empirically adequate hidden-variable models might exist which presuppose a weaker notion of local causality. We will show that a Bell-type inequality can be derived also from these weaker assumptions. IntroductionThe EPR-Bohm experimentLocal causalityBell's inequality from separate common causes4.1 A weak screening-off principle4.2 Perfect correlation and ‘determinism’4.3 A minimal theory for spins4.4 No conspiracyDiscussion.

In _Violence and Civility_, Étienne Balibar boldly confronts the insidious causes of violence, racism, nationalism, and ethnic cleansing worldwide, as well as mass poverty and dispossession. Through a novel synthesis of theory and empirical studies of contemporary violence, the acclaimed thinker pushes past the limits of political philosophy to reconceive war, revolution, sovereignty, and class. Through the pathbreaking thought of Derrida, Balibar builds a topography of cruelty converted into extremism by ideology, juxtaposing its subjective forms and its objective manifestations. Engaging (...) with Marx, Hegel, Hobbes, Clausewitz, Schmitt, and Luxemburg, Balibar introduces a new, productive understanding of politics as antiviolence and a fresh approach to achieving and sustaining civility. Rooted in the principles of transformation and empowerment, this theory brings hope to a world increasingly divided even as it draws closer together. (shrink)

Reproductive tourism is the travelling by candidate service recipients from one institution, jurisdiction, or country where treatment is not available to another institution, jurisdiction, or country where they can obtain the kind of medically assisted reproduction they desire. The more widespread this phenomenon, the louder the call for international measures to stop these movements. Three possible solutions are discussed: internal moral pluralism, coerced conformity, and international harmonisation. The position is defended that allowing reproductive tourism is a form of tolerance that (...) prevents the frontal clash between the majority who imposes its view and the minority who claim to have a moral right to some medical service. Reproductive tourism is moral pluralism realised by moving across legal borders. As such, this pragmatic solution presupposes legal diversity. (shrink)

The dictum ‘“ought” implies “can”’ has a status in moral philosophy in some respects like that of ‘a good player needs good co-ordination’ in talk about ball-games. Clearly, you say something important but not conclusive about proficiency in playing a ball-game when you say that it requires good co-ordination: similarly, you say something important but not conclusive about obligation when you say that it implies a certain possibility or power or ability. Each dictum is a reminder: the one about such (...) courses of physical instruction, the other about such exhortations to duty, as are worth persevering with. It would be hopeless to keep on teaching a boy the moves and tricks of rugby football if he could never co-ordinate well enough to get his eye in, so to speak. Correspondingly, it would be meaningless to recommend that someone ought to do something the specification of which involved a contradiction, and pointless to suggest that he ought to do something which, for quite general reasons, was not, and was certain to remain not, within his power. So each dictum expresses a bluff, no-nonsense wisdom which we should count on before involving ourselves in certain more detailed commitments. But probably this is as far as the comparison between the two sayings can well be taken. (shrink)

In contrast to symbolic or associationist representations, I advocate a third form of representing information that employs geometrical structures. I argue that this form is appropriate for modelling concept learning. By using the geometrical structures of what I call conceptual spaces, I define properties and concepts. A learning model that shows how properties and concepts can be learned in a simple but naturalistic way is then presented. I also discuss the advantages of the geometric approach over the symbolic and associationist (...) traditions. (shrink)

This paper argues that the choice of backing to certify the authority of a warrant requires a legitimation inference. When brought into question, such an inference becomes a claim defended by showing sound reasons for the selection of backing pertinent to a shared context. Legitimation controversies ensue when an attributed consensus meets objection. It is argued that attention to legitimation controversies renders the Toulmin model a more useful critical paradigm for investigating the development and risks of communicative reasoning in a (...) public forum. The nomination of John Tower as Secretary of Defense is employed to illustrate how critical analysis of legitimation controversies reflexively expands the domain of inquiry for informal reasoning. (shrink)

Blood banks all over the world attempt to cover the demand for blood by donations from voluntary non-remunerated donors. The discussion regarding the acceptability of blood donations by haemochromatosis patients focuses on the question of whether health benefits violate the rule of the altruistic donor. Utilitarian and deontological arguments for and against the policy of accepting blood donors who need to let blood regularly in order to stay healthy are considered by this article. A closer look at the procedure reveals (...) that the confusion is due to the conflation of, on the one hand the phlebotomy, and on the other hand, the decision about the destination of the blood afterwards. The health benefits are connected to the phlebotomy and not to the donation. The morally relevant point in the decision as to whether the candidate is a truly altruistic donor is whether he donates without asking for a benefit in return. It is concluded that haemochromatosis patients can be free, voluntary, and altruistic blood donors. (shrink)

Extreme rates of premature death prior to the advent of modern medicine, very low rates of premature death in First World nations with low rates of prayer, and the least flawed of a large series of clinical trials indicate that remote prayer is not efficacious in treating illness. Mass contamination of sample cohorts renders such clinical studies inherently ineffectual. The required supernatural and paranormal mechanisms render them implausible. The possibility that the latter are not benign, and the potentially adverse psychological (...) impact of certain protocols, renders these medical trials unethical. Resources should no longer be wasted on medical efforts to detect the supernatural and paranormal. (shrink)

The widespread abandonment of frozen embryos by the gamete providers or intentional parents urgently demands a solution. Most centres react by requiring patients to enter a prior agreement governing the future disposition of their embryos in all foreseeable circumstances. These dispositional directives are inappropriate and self defeating in the event of contingencies in which the patients remain competent to execute an updated directive. Internal and external changes may invalidate the prior directive by altering the situation as represented by the couple (...) at the initiation of treatment to such an extent that it no longer corresponds with the actual situation at the time of the execution of the disposition. The prior agreement should only be considered binding if the agreement among the partners on a specific option was a material condition for one of the partners to start treatment. (shrink)

The word “beautiful” plays a surprisingly unimportant part in the language of sophisticated artistic appreciation; I mean in the informed criticism and comparison of specific works of art. Though in ordinary conversation it can be used naturally and easily, it does not serve readily as a technical term in expert writing or discussion. To become a technical term of this kind it would have to be definable, and definable in terms which commanded sufficient agreement: but attempts to define “beauty” and (...) “beautiful” may well have become restrained by the popularity of philosophical discussion about the significance of these words. No philosophical question is discussed more commonly or from more firmly held opposite positions than the question whether beauty is “objective” or not. Discussion of this and related topics, however, not being the monopoly of professed philosophers but being familiar amongst artists and art critics themselves, tends to remove all shadow of technicality from the crucial terms discussed. Other terms come to serve for the “objective” features of works of art, and others again for the impressions which works of art may make upon us: “beauty” and “beautiful” tend to fall away between these two classes. (shrink)

I want to explore the possibility of an a posteriori approach to the elucidation of certain moral notions. These are: (a) the notion of a duty, some specific thing which it is incumbent on me to do, and (b) the notion of something that is a good thing for me to do. I want to consider these notions, so far as I can, independently of rules. There is a certain sense in which having a duty to do this or that (...) is a function of circumstances, and in which this or that's being a good thing to do is likewise a function of circumstances. I shall suggest specific examples in which this is a conspicuous feature of ‘my duty’ or of what I can, beneficially, do. In these examples what I ought to do, and what it is good to do, can be represented as special ways in which what I am to do presents itself. (shrink)

In the course of his life a man surrounds himself with questions, much as he surrounds himself with furniture, books or pictures. Personality is expressed not only by the selection of a Chippendale chair, the amassing of early colour-plate books, or the purchase of a Renoir, but also by the kind of questions which a man “collects”-raises, without necessarily solving. Some questions, like some books, are to be brooded over and studied; some are introduced only to be contemplated from time (...) to time, like fine bindings; and some occur so casually as hardly to rouse any attention at all. There is an obvious difference between a man who bids carefully at a book auction or forces himself on to his knees to identify a dust-covered quarto in a slum bookshop, and a man whose library is inherited from parents or grandparents; acceptances and not choices will distinguish the casual possessor from the bookman. Similarly, there are many questions which sit lightly on a man's mind, which are as little the object of sustained wondering or bafflement as his ancestors” well bound volumes of theology or game-shooting are the reflection of his own tastes or interests. These may be questions of any sort: they may be factual questions, important or trivial, or they may be theoretical questions, philosophical perhaps, or religious or scientific. A student of literature, for instance, has been known to congratulate himself on his ignorance of modern science, ignorance so deliberate that any scientific question raised in his presence fails even to make him wonder. For any person, however, there are ranges of questions which barely touch his mind: he may be aware that he does not know how to derive answers to them for himself, but his inability will not cause him concern. The memory, the practical or the reasoning skill of the kind that would be required are perhaps so much out of proportion to what he possesses that to bemoan the lack of them is unrealistic -as it is often idle and merely conventional for one who is tone-deaf to say how much he wishes he could sing an aria . Other questions altogether, important or trivial, he takes seriously and troubles to answer, because they touch his own special interests directly: he may pride himself on never neglecting a newspaper problem in bridge or chess, or he may never fail to answer correctly a question about the construction of some instrument or machine. The same person, however, will also get the length of raising many questions which remain mere questions. He may be troubled and puzzled about certain political or social question which circumstances do not compel him to answer: but he will not be hypocritical in professing an interest in them. Some of these questions, of course, may become solved after a fashion, if he listens to the voice of politician, statistician, priest or psychologist and is lucky enough to get an answer which satisfies him. But many will survive with just enough recurrences of wondering about them to make them, as you might say, chronic. This is the intermediate class of questions. (shrink)

This paper and its predecessor () are about the question: 'Are the events in the entire universe encoded in and predictable from any of its parts?' To approach a positive answer in classical physics, the following result is proved and commented on: in Newton's theory of gravitation, the entire trajectory of a particle can be predicted given any segment of it, regardless of how the other particles are moving-provided that there is only a finite number of particles and that their (...) speeds remain bounded. (It is this condition, together with a set of parameters characterising the motion of the other particles, which enables us to estimate the effect of the other particles on the trajectory of the given particle.) The extension of this result to other theories, in particular to special relativity, is discussed. (shrink)

A critical theory of controversy would require the integration ofthe normative study of argumentation with critical studies of practices. Jiirgen Habermas has made a substantial contribution to such a project by embedding argumentation in a theory of communication, while critically engaging academic and public debates. This essay explicates core concepts in Habermas's theory of argumentation, including his distinction between theory and practice, the different validity requirements for argumentation in general, the norms of moral and ethical-political argumentation and of bargaining. Argument (...) predicaments are posited as ways to discover and assess different types of validity claims competing as "the force ofthe better argument". Habermas's criticism of "administrative power" and "communicative power" illustrates a potential yield of critical inquiry into social controversy. (shrink)