We investigate the notion of relevance as it pertains to ‘commonsense’, subjunctive conditionals. Relevance is taken here as a relation between a property (such as having a broken wing) and a conditional (such as birds typically fly). Specifically, we explore a notion of ‘causative’ relevance, distinct from ‘evidential’ relevance found, for example, in probabilistic approaches. A series of postulates characterising a minimal, parsimonious concept of relevance is developed. Along the way we argue that no purely logical account of relevance (even (...) at the metalevel) is possible. Finally, and with minimal restrictions, an explicit definition that agrees with the postulates is given. (shrink)

This paper describes an approach for reasoning in a dynamic domain with nondeterministic actions in which an agent’s beliefs correspond to the simplest, or most plausible, course of events consistent with the agent’s observations and beliefs. The account is based on an epistemic extension of the situation calculus, a first-order theory of reasoning about action that accommodates sensing actions. In particular, the account is based on a qualitative theory of nondeterminism. Our position is that for commonsense reasoning, the world is (...) most usefully regarded as deterministic, and that nondeterminism is an epistemic phenomenon, arising from an agent’s limited awareness and perception. The account offers several advantages: an agent has a set of categorical beliefs, yet can deal with equally-likely outcomes or with outcomes of differing plausibility. The agent maintains as its set of contingent beliefs the most plausible, or simplest, picture of the world, consistent with its beliefs and actions it believes it executed; yet it may modify these in light of later information. (shrink)

In this paper we explore a class of belief update operators, in which the definition of the operator is compositional with respect to the sentence to be added. The goal is to provide an update operator that is intuitive, in that its definition is based on a recursive decomposition of the update sentence’s structure, and that may be reasonably implemented. In addressing update, we first provide a definition phrased in terms of the models of a knowledge base. While this operator (...) satisfies a core group of the benchmark Katsuno Mendelzon update postulates, not all of the postulates are satisfied. Other Katsuno Mendelzon postulates can be obtained by suitably restricting the syntactic form of the sentence for update, as we show. In restricting the syntactic form of the sentence for update, we also obtain a hierarchy of update operators with Winslett’s standard semantics as the most basic interesting approach captured. We subsequently give an algorithm which captures this approach; in the general case the algorithm is exponential, but with some not unreasonable assumptions we obtain an algorithm that is linear in the size of the knowledge base. Hence the resulting approach has much better complexity characteristics than other operators in some situations. We also explore other compositional belief change operators: erasure is developed as a dual operator to update; we show that a forget operator is definable in terms of update; and we give a definition of the compositional revision operator. We obtain that compositional revision, under the most natural definition, yields the Satoh revision operator. (shrink)

One of the standard principles of rationality guiding traditional accounts of belief change is the principle of minimal change: a reasoner's belief corpus should be modified in a minimal fashion when assimilating new information. This rationality principle has stood belief change in good stead. However, it does not deal properly with all belief change scenarios. We introduce a novel account of belief change motivated by one of Grice's maxims of conversational implicature: the reasoner's belief corpus is modified in a minimal (...) fashion to assimilate exactly the new information. In this form of belief change, when the reasoner revises by new information p ∨ q their belief corpus is modified so that p∨q is believed but stronger propositions like p∧q are not, no matter what beliefs are in the reasoner's initial corpus. We term this conservative belief change since the revised belief corpus is a conservative extension of the original belief corpus given the new information. (shrink)

This special issue presents a selection of papers in Knowledge Representation in Artificial Intelligence , intended to illustrate the depth and breadth of current research in the area. It comes just over 25 years since a similar special issue of the Journal of Philosophical Logic appeared on the topic Philosophical Logic and Artificial Intelligence [15]. This latter special issue covered work addressing the use of logic, in one form or another, for representing and reasoning with knowledge. The papers of the (...) 1988 special issue give a good indication of major themes of research at the time: reasoning about belief and knowledge [5], tractable logical reasoning [10], nonmonotonicity [11], and reasoning about action [13]. These topics can be considered to be centrally in KR; the current issue then also serves to indicate how the field has broadened and evolved over the last 25 years.Traditionally the area of Knowledge Representation has been seen as “the field of study concerned w .. (shrink)

Consistency-based approaches in nonmonotonic reasoning may be expected to yield multiple sets of default conclusions for a given default theory. Reasoning about such extensions is carried out at the meta-level. In this paper, we show how such reasoning may be carried out at the object level for a large class of default theories. Essentially we show how one can translate a default theory Δ, obtaining a second Δ', such that Δ has a single extension that encodes every extension of _. (...) Moreover, our translated theory is only a constant factor larger than the original. We prove that our translation behaves correctly. In the approach we can now encode the notion of extension from within the framework of standard default logic. Hence one can encode notions such as skeptical and credulous conclusions, and can reason about such conclusions within a single extension. This result has some theoretical interest, in that it shows how multiple extensions of semi-monotonic default theories are encodable with manageable overhead in a single extension. (shrink)

The contributions to the Special Issue on Multiple Belief Change, Iterated Belief Change and Preference Aggregation are divided into three parts. Four contributions are grouped under the heading "multiple belief change" (Part I, with authors M. Falappa, E. Fermé, G. Kern-Isberner, P. Peppas, M. Reis, and G. Simari), five contributions under the heading "iterated belief change" (Part II, with authors G. Bonanno, S.O. Hansson, A. Nayak, M. Orgun, R. Ramachandran, H. Rott, and E. Weydert). These papers do not only pick (...) up the particular questions raised, but also extend and modify the framework of Alchourrón, Gärdenfors and Makinson. Part III deals with preference aggregation and consists of one contribution (by F. Herzberg and D. Eckert). (shrink)

Abstract.The paper outlines the approach to the analysis of deontic conditionals taken in earlier work by Jones and Pörn, compares it very briefly with two main trends within dyadic deontic logic, and then discusses problems associated with the augmentation principle and the factual detachment principle. The author then modifies Jones and Pörn's previous system, using a classical but not normal (in the sense of Chellas) deontic modality to provide the basis for an alternative analysis of deontic conditionals. This new analysis (...) validates neither the factual detachment nor the augmentation principles. However, influenced by the approach of James Delgrande to default reasoning, the author tries to show how a restricted form of factual detachment may be accommodated within the revised system. (shrink)

The Gifford Lectures were established in 1885 at the universities of St Andrews, Glasgow, Aberdeen and Edinburgh to promote the discussion of 'Natural Theology in the widest sense of the term - in other words, the knowledge of God', and some of the world's most influential thinkers have delivered them. The 1901–2 lectures given in Edinburgh by American philosopher William James are considered by many to be the greatest in the series. The lectures were published in book form in (...) 1902 and have been reprinted many times. James, who was educated in the United States and Europe, and spent much of his career teaching philosophy at Harvard, was very influential in the development of modern psychology, and in these twenty lectures he explores the personal experience of religion. Some of the topics include religion and neurology, 'the sick soul', saintliness, and mysticism. (shrink)

The past few decades have seen an explosion of research on causal reasoning in philosophy, computer science, and statistics, as well as descriptive work in psychology. In Causation with a Human Face, James Woodward integrates these lines of research and argues for an understanding of how each can inform the other: normative ideas can suggest interesting experiments, while descriptive results can suggest important normative concepts. Woodward's overall framework builds on the interventionist treatment of causation that he developed in Making (...) Things Happen. Normative ideas discussed include proposals about the role of invariant or stable relationships in successful causal reasoning and the notion of proportionality. He argues that these normative ideas are reflected in the causal judgments that people actually make as a descriptive matter. Woodward also discusses the common philosophical practice-particularly salient in philosophical accounts of causation--of appealing to intuitions or judgments about cases in support of philosophical theses. He explores how, properly understood, such appeals are not different in principle from appeals to results from empirical research, and demonstrates how they may serve as a useful source of information about causal cognition. (shrink)

Constitutionalism in an Age of Diversity James Tully. these ambassadors from Haida Gwaii conciliate the goods which appear irreconcilable to us? To discover the answer, and learn our way around on this strange common ground, we need to ...

Is there a world beyond the senses? Can we perceive future events before they occur? Is it possible to communicate with others without need of our complex sensory-perceptual apparatus that has evolved over hundreds of millions of years? Can our minds/souls/personalities leave our bodies and operate with all the knowledge and information-processing ability that is normally dependent upon the physical brain? Do our personalities survive physical death?

Few can imagine a world without telephones or televisions; many depend on computers and the Internet as part of daily life. Without scientific theory, these developments would not have been possible. In this exceptionally clear and engaging introduction to philosophy of science, James Ladyman explores the philosophical questions that arise when we reflect on the nature of the scientific method and the knowledge it produces. He discusses whether fundamental philosophical questions about knowledge and reality might be answered by science, (...) and considers in detail the debate between realists and antirealists about the extent of scientific knowledge. Along the way, central topics in philosophy of science, such as the demarcation of science from non-science, induction, confirmation and falsification, the relationship between theory and observation and relativism are all addressed. Important and complex current debates over underdetermination, inference to the best explaination and the implications of radical theory change are clarified and clearly explained for those new to the subject. (shrink)

James Van Cleve examines the main topics from Kant's Critique of Pure Reason, such as transcendental idealism, necessity and analyticity, space and time, substance and cause, noumena and things-in-themselves, problems of the self, and rational theology. He also discusses the relationship between Kant's thought and that of modern anti-realists, such as Putnam and Dummett. Because Van Cleve focuses upon specific problems rather than upon entire passages or sections of the Critique, he makes Kant's work more accessible to the serious (...) student and scholar. (shrink)

John Locke's theory of property is perhaps the most distinctive and the most influential aspect of his political theory. In this book James Tully uses an hermeneutical and analytical approach to offer a revolutionary revision of early modern theories of property, focusing particularly on that of Locke. Setting his analysis within the intellectual context of the seventeenth century, Professor Tully overturns the standard interpretations of Locke's theory, showing that it is not a justification of private property. Instead he shows (...) it to be a theory of individual use rights within a framework of inclusive claim rights. He links Locke's conception of rights not merely to his ethical theory, but to the central arguments of his epistemology, and illuminates the way in which Locke's theory is tied to his metaphysical views of God and man, his theory of revolution and his account of a legitimate polity. (shrink)

This paper presents a counterfactual account of what a mechanism is. Mechanisms consist of parts, the behavior of which conforms to generalizations that are invariant under interventions, and which are modular in the sense that it is possible in principle to change the behavior of one part independently of the others. Each of these features can be captured by the truth of certain counterfactuals.

This book aims to pinpoint the connection feelings have with behaviour - a connection that, while clear, has never been fully explained. Following William James, Laird argues that feelings are not the cause of behavior but rather its consequences; the same goes for behaviour and motives and behaviour and attitudes. He presents research into feelings across the spectrum, from anger to joy to fear to romantic love, that support this against-the-grain view. Laird discusses the problem of common sense, self-perception (...) theory, the association between feelings and higher cognitive processes, and also the literature on facial expression, posture, and gaze. (shrink)

Following up on his previous book, _Violence and Phenomenology_, James Dodd presents here an expanded and deepened reflection on the problem of violence. The book’s six essays are guided by a skeptical philosophical attitude about the meaning of violence that refuses to conform to the exigencies of essence and the stable patterns of lived experience. Each essay tracks a discoverable, sometimes familiar figure of violence, while at the same time questioning its limits and revealing sites of its resistance to (...) conceptualization. Dodd’s essays are readings as much as they are reflections; attempts at interpretation as much as they are attempts to push concepts of violence to their limits. They draw upon a range of different authors—Sartre, Levinas, Schelling, Scheler, and Husserl—and historical moments, but without any attempt to reduce them into a series of examples elucidating a comprehensive theory. The aim is to follow a path of distinctively episodic and provisional modes of thinking and reflection that offers a potential glimpse at how violence can be understood. (shrink)

One of the most influential men of his time, philosopher, psychologist, educator, and author William James (1842-1910) helped lead the transition from a predominantly European-centered nineteenth-century philosophy to a new "pragmatic" American philosophy. Helping to pave the way was his seminal book Pragmatism (1907), in which he included a chapter on "Truth," an essay which provoked severe criticism. In response, he wrote the present work, an attempt to bring together all he had ever written on the theory of knowledge, (...) including an article on the function of cognition, later polemic and expository contributions, and some replies to previous criticism. The result was a full and definitive expression of the pragmatist "epistemology" from James' point of view. In the book, he urges the reader to "turn away from abstractions, verbal solutions, fixed principles, and pretended absolutes and look for concreteness and facts, action and power," arguing that "the ultimate test for us of what a truth means is the conduct it dictates or inspires." For students, scholars--anyone interested in William James or the history of American philosophical thought--this book offers an in-depth exposition of the influential ideas of one of the greatest American thinkers. Unabridged republication of the edition originally published by Longmans, Green and Co., New York and London, 1909. (shrink)

Designed for use by philosophy students, this 2006 book provides an accessible, yet technically sound treatment of modal logic and its philosophical applications. Every effort has been made to simplify the presentation by using diagrams in place of more complex mathematical apparatus. These and other innovations provide philosophers with easy access to a rich variety of topics in modal logic, including a full coverage of quantified modal logic, non-rigid designators, definite descriptions, and the de-re de-dictio distinction. Discussion of philosophical issues (...) concerning the development of modal logic is woven into the text. The book uses natural deduction systems and also includes a diagram technique that extends the method of truth trees to modal logic. This feature provides a foundation for a novel method for showing completeness, one that is easy to extend to systems that include quantifiers. (shrink)

This article defends the use of interventionist counterfactuals to elucidate causal and explanatory claims against criticisms advanced by James Bogen and Peter Machamer. Against Bogen, I argue that counterfactual claims concerning what would happen under interventions are meaningful and have determinate truth values, even in a deterministic world. I also argue, against both Machamer and Bogen, that we need to appeal to counterfactuals to capture the notions like causal relevance and causal mechanism. Contrary to what both authors suppose, counterfactuals (...) are not "unscientific" - a substantial tradition within statistics and the causal modelling literature makes heavy use of them. (shrink)

This book on modal logic is especially designed for philosophy students. It provides an accessible yet technically sound treatment of modal logic and its philosophical applications. Every effort is made to simplify the presentation by using diagrams instead of more complex mathematical apparatus. These and other innovations provide philosophers with easy access to a rich variety of topics in modal logic, including a full coverage of quantified modal logic, non-rigid designators, definite descriptions, and the de-re de-dicto distinction. Discussion of philosophical (...) issues concerning the development of modal logic is woven into the text. The book uses natural deduction systems, which are widely regarded as the easiest to teach and use. It also includes a diagram technique that extends the method of truth trees to modal logic. This provides a foundation for a novel method for showing completeness that is easy to extend to quantifiers. This second edition contains a new chapter on logics of conditionals, an updated and expanded bibliography, and is updated throughout. (shrink)

A prehistory of today's humanities, from ancient Greece to the early twentieth century Many today do not recognize the word, but "philology" was for centuries nearly synonymous with humanistic intellectual life, encompassing not only the study of Greek and Roman literature and the Bible but also all other studies of language and literature, as well as history, culture, art, and more. In short, philology was the queen of the human sciences. How did it become little more than an archaic word? (...) In Philology, the first history of Western humanistic learning as a connected whole ever published in English, James Turner tells the fascinating, forgotten story of how the study of languages and texts led to the modern humanities and the modern university. The humanities today face a crisis of relevance, if not of meaning and purpose. Understanding their common origins—and what they still share—has never been more urgent. (shrink)

Comprehensive Biomedical Research Centre and Centre for Philosophy, Justice and Health, UCL, First Floor, Charles Bell House, 67–73 Riding House Street, London W1W 7EJ, UK. Tel.: +44 (0)20 7679 9417; Fax: +44 (0)20 7679 9426; Email: james-gs.wilson{at}ucl.ac.uk ' + u + '@' + d + ' '//--> . Abstract This paper aims to shed some light on the difficulties we face in constructing a generally acceptable normative framework for thinking about public health. It argues that there are three factors (...) that combine to make theorising about public health difficult, and which when taken together defeat simplistic top-down and bottom-up approaches to the design of public health policies. The first factor is the problem of complex systems, namely that the distribution of health both affects and is affected by the distribution of other goods. The second is the difficulty of defining the goals of public health: we still need to get clear about what we should mean by health in this context, and what the goals of public health should be. The third is that we stand in need of an account of how important health is relative to the importance of other goods that a just society should be trying to secure for its citizens. The paper argues that these problems should lead us to abandon the search for a ‘one-size fits all’ normative framework for thinking about public health. Rather, different approaches will be appropriate at different levels of abstraction. CiteULike Connotea Del.icio.us What's this? (shrink)

Ludwig Wittgenstein's _Tractatus Logico-Philosophicus_ and _Philosophical Investigations_ are among the most influential philosophical books of the twentieth century, and also among the most perplexing. Wittgenstein warned again and again that he was not and would not be understood. Moreover, Wittgenstein's work seems to have little relevance to the way philosophy is done today. In _Wittgenstein in Exile_, James Klagge proposes a new way of looking at Wittgenstein -- as an exile -- that helps make sense of this. Wittgenstein's exile (...) was not, despite his wanderings from Vienna to Cambridge to Norway to Ireland, strictly geographical; rather, Klagge argues, Wittgenstein was never at home in the twentieth century. He was in exile from an earlier era -- Oswald Spengler's culture of the early nineteenth century. Klagge draws on the full range of evidence, including Wittgenstein's published work, the complete Nachlaß, correspondence, lectures, and conversations. He places Wittgenstein's work in a broad context, along a trajectory of thought that includes Job, Goethe, and Dostoyevsky. Yet Klagge also writes from an analytic philosophical perspective, discussing such topics as essentialism, private experience, relativism, causation, and eliminativism. Once we see Wittgenstein's exile, Klagge argues, we will gain a better appreciation of the difficulty of understanding Wittgenstein and his work. (shrink)

This article attempts to make sense of Oakeshott's enigmatic comment in 'On Human Conduct' that it was perhaps injudicious of Hegel to use the word state in the Philosophy of Right for his conception of a bounded association. But the article does not confine itself to making sense of Oakeshott's meaning: it compares Oakeshott's conception of societas to Hegel's conception of der Staat, Oakeshott's conception of philosophy as an unconditional consideration of conditional objects with Hegel's conception of philosophy as a (...) reflexive consideration of the rationality immanent within unconditional objects, and Oakeshott's avoidance of divinity with Hegel's involvement in it. It is part of the purpose of this article to illustrate the suggestion that conceptions of God and conceptions of the state are closely related in the thought of both philosophers -- and possibly in all philosophy: and that the problem of the state is therefore a problem as much religious as secular. (shrink)