This article shows a clear sense in which general relativity allows for a type of ‘machine’ that can bring about a spacetime structure suitable for the implementation of ‘supertasks’. 1Introduction2Preliminaries3Malament–Hogarth Spacetimes4Machines5Malament–Hogarth Machines6Conclusion.

I analyze a number of the quantum no-signalling proofs (Ghirardi et al. 1980, Bussey 1982, Jordan 1983, Shimony 1985, Redhead 1987, Eberhard and Ross 1989, Sherer and Busch 1993). These purport to show that the EPR correlations cannot be exploited for transmitting signals, i.e., are not causal. First, I show that these proofs can be mathematically unified; they are disguised versions of a single theorem. Second, I argue that these proofs are circular. The essential theorem relies upon the tensor product (...) representation for combined systems, which has no physical basis in the von Neumann axioms. Historically, the construction of this representation scheme by von Neumann and Weyl built no-signalling assumptions into the quantum theory. Signalling between the wings of the EPR-Bell experiments is unlikely but is not ruled out empirically by the class of proofs considered. (shrink)

We show a sense in which the spacetime property of effective completeness—a type of “local hole-freeness” or “local inextendibility”—is not stable.

This introduction to one of the liveliest and most popular fields in philosophy is written specifically for a beginning readership with no background in philosophy or science. Step-by-step analyses of the key arguments are provided and the philosophical heart of the issues is revealed without recourse to jargon, maths, or logical formulas. The book introduces Einstein's revolutionary ideas in a clear and simple way, along with the concepts and arguments of philosophers, both ancient and modern that have proved of lasting (...) value. Specifically, the theories of the ancient Greek philosophers, Zeno, Euclid and Parmenides are considered alongside the ideas of Newton, Leibniz and Kant as well as the giants of twentieth-century physics, Einstein and Lorentz. The problems at the heart of the philosophy of space and time, such as change, motion, infinity, shape, and inflation, are examined and the seismic impact made by relativity theory and quantum theory is assessed in the light of the latest research. The writing is lucid and entertaining, allowing a beginning readership to grasp some difficult concepts while offering the more experienced reader a succinct and illuminating presentation of the state of the debate. "Space, Time and Einstein" shows the reader the excitement of scientific discovery and the beauty of theory in the search for answers to these fundamental questions. (shrink)

We present six significant open problems in Pure Inductive Logic, together with their background and current status, with the intention of raising awareness and leading ultimately to their resolution.

Shortly before his death in 1934, the British historian of chemistry, A. N. Meldrum, published two lengthy articles on Lavoisier's early career in science. After a careful investigation of the collection of manuscripts at the Académie des Sciences in Paris and in light of a detailed and penetrating analysis of Lavoisier's published work, Meldrum concluded that as a youth, Lavoisier was concerned with chemistry only to the extent that he found it useful for his mineralogical and geological researches. Lavoisier began (...) his career as a mineralogist; he became a chemist only in 1772, the “crucial year” when he turned his attention to chemical theory for its own sake and started his famous course of experiments on the nature of combustion and fixed air. Although some details—notably concerning Lavoisier's early education and geological work—have been added to this account since Meldrum's time, the broad conclusions of Meldrum's study are still generally accepted by historians of the chemical revolution. (shrink)

Biologists have as yet taken but little cognizance of the revolution in human thought which has been inaugurated by physicists in the last five years, and philosophers have stressed its negative rather than its positive side.

Here we discuss the challenge posed by self-organization to the Darwinian conception of evolution. As we point out, natural selection can only be the major creative agency in evolution if all or most of the adaptive complexity manifest in living organisms is built up over many generations by the cumulative selection of naturally occurring small, random mutations or variants, i.e., additive, incremental steps over an extended period of time. Biological self-organization—witnessed classically in the folding of a protein, or in the (...) formation of the cell membrane—is a fundamentally different means of generating complexity. We agree that self-organizing systems may be fine-tuned by selection and that self-organization may be therefore considered a complementary mechanism to natural selection as a causal agency in the evolution of life. But we argue that if self-organization proves to be a common mechanism for the generation of adaptive order from the molecular to the organismic level, then this will greatly undermine the Darwinian claim that natural selection is the major creative agency in evolution. We also point out that although complex self-organizing systems are easy to create in the electronic realm of cellular automata, to date translating in silico simulations into real material structures that self-organize into complex forms from local interactions between their constituents has not proved easy. This suggests that self-organizing systems analogous to those utilized by biological systems are at least rare and may indeed represent, as pre-Darwinists believed, a unique ascending hierarchy of natural forms. Such a unique adaptive hierarchy would pose another major challenge to the current Darwinian view of evolution, as it would mean the basic forms of life are necessary features of the order of nature and that the major pathways of evolution are determined by physical law, or more specifically by the self-organizing properties of biomatter, rather than natural selection. (shrink)

If one takes a course in philosophy to-day at a British university, a discreet silence is usually observed about existentialism. Often the professors understand little of its methods or its doctrine. If their excuse in part is the inaccessibility in English of standard existentialist texts, it is true also that philosophers trained in the “critical philosophy” now in vogue feel a certain aversion to existentialism or, at all events, to the notion they have formed of it. If Christianity was a (...) scandal to the Greeks and remains a scandal, as Dr. Brunner has recently told us, to contemporary humanists, existentialism is a scandal to the positivists. The latter are aware that the existentialists habitually trespass in the fields of religion, ethics, aesthetics and psychology, fields which, on the positivist view, should be reserved to other disciplines than philosophy, which has its own distinctive subject-matter and approach. They know that certain existentialists, notably Heidegger, provide a happy hunting ground for examples of “metaphysics.” They have heard that existentialism has sought to turn the tables on positivism by accusing it, if not of metaphysics, at all events of a barrenness of significant content, of a preoccupation with mere logistics which removes philosophy completely from men's business and bosoms. If the positivist accuses the existentialist of perpetrating “nonsense” in a technical sense, the latter retorts by accusing the positivist of reducing philosophy to nonsense in a pragmatic sense. (shrink)

Alexandre Koyre was one of the most prominent historians of science of the twentieth century. The standard interpretation of Koyre is that he falls squarely within the internalist camp of historians of science-that he focuses on the history of the ideas themselves, eschewing cultural and sociological interpretations regarding the influence of ideologies and institutions on the development of science. When we read what Koyre has to say about his historical studies (and most of what others have said about them), we (...) find him embracing and championing this Platonic view of his work. Ultimately I think this interpretation of Koyre's history of science is lopsided and in need of correction. I claim, rather, that a careful reading of Koyre's work suggests that a tension exists between internal and external methodological considerations. The external considerations stem from Koyre's commitment to the unity of human thought and the influence he admits that the 'transscientifiques' (philosophy, metaphysics, religion) have on the development of science. I suggest in conclusion then, that if we are to put a philosophical label on his work, rather than 'Platonist', as has been the custom, 'Hegelian' makes a better fit. (shrink)

What obligations do global actors have to prevent terrorism? Is consent required to create an international obligation, or does the correctness of its goals ground its legitimacy? In this paper, I consider these questions with respect to a subset of international law often overlooked: anti-money laundering and combating the financing of terrorism . AML/CFT comprises peaceful response to violence and terrorism, making it a significant component of international justice and diplomacy. First, I present the current legal framework for AML/CFT institutions (...) and identify two conflicting sources of justification: objective value and consent. The fix for this problem, I argue, does not come from either component alone. Objective value cannot provide the sole source of justification because it cannot settle the choice between multiple competing norms that would achieve the same objective goods were we to follow them . Consent cannot provide the sole source of justification (‘the const.. (shrink)

It is proposed that symmetry of stone tools may derive from perceptual similarity rather than from cognitively more complex awareness of symmetry. Although encodement of shapes necessarily involves symmetry (as evidenced by the confusability of enantiomorphs), it does not imply awareness of symmetry. Responses of relatively simple organisms, such as bees, support the notion that the processes involved are likely to be perceptual.