Defeasibility, most generally speaking, means that given some set of conditions A, something else B will hold, unless or until defeating conditions C apply. While the term was introduced into philosophy by legal philosopher H.L.A. Hart in 1949, today, the concept of defeasibility is employed in many different areas of philosophy. This volume for the first time brings together contributions on defeasibility from epistemology (Mikael Janvid, Klemens Kappel, Hannes Ole Matthiessen, Marcus Willaschek, Michael Williams), legal philosophy (Frederick Schauer) and ethics and the philosophy of action (Claudia Blöser, R. Jay Wallace, Michael Quante and Katarzyna Paprzycka). The volume ends with an extensive bibliography (by Michael de Araujo Kurth).

When a legal rule requires us to drive on the right, notarize our wills, or refrain from selling bootleg liquor, how are we to describe and understand that requirement? In particular, how does the logical form of such a requirement relate to the logical form of other requirements, such as moral requirements, or the requirements of logic itself? When a general legal rule is applied or distinguished in a particular case, how can we describe that process in logical form? Such questions have come to preoccupy modern legal philosophy as its methodology, drawing on the philosophy of logic, becomes ever more sophisticated. This collection gathers together some of the most prominent legal philosophers in the Anglo-American and civil law traditions to analyse the logical structure of legal norms. They focus on the issue of defeasibility, which has become a central concern for both logicians and legal philosophers in recent years. The book is divided into four parts. The first section is devoted to unravelling the basic concepts related to legal defeasibility and the logical structure of legal norms, focusing on the idea that law, or its components, are liable to implicit exceptions, which cannot be specified before the law's application to particular cases. Part two aims to disentangle the main relations between the issue of legal defeasibility and the issue of legal interpretation, exploring the topic of defeasibility as a product of certain argumentative techniques in the law. Section 3 of the volume is dedicated to one of the most problematic issues in the history of jurisprudence: the connections between law and morality. Finally, section 4 of the volume is devoted to analysing the relationships between defeasibility and legal adjudication.

Within limits, the law allows for exceptions. Or so we tend to think. In fact, the line between rules and exceptions is harder to draw than it seems. How are we to determine what counts as an exception and what as part of the relevant rule? The distinction has important practical implications. But legal theorists have found the notion of an exception surprisingly difficult to explain. This is the longstanding jurisprudential problem that this book seeks to solve.

These 13 papers collected from several meetings of the Society for Exact Philosophy from 1993-96 take a variety of approaches to the task of integrating normative and defeasible reasoning. While most of the papers propose some version of defeasible deontic logic, a few consider alternatives approaches to solving some of the puzzles of normative reasoning that deontic reasoning has failed to resolve. The authors also describe standard deontic logic. Name index only. Annotation copyrighted by Book News, Inc., Portland, OR

Informatics and the Foundations of Legal Reasoning represents a close collaboration between a wide range of disciplines and countries. Fourteen papers, together with a long analytical introduction by the editors, were selected from the contributions of legal theorists, computer scientists, philosophers and logicians who were members of an International Working Group supported by the European Commission. The Group was mandated to work towards determining how far the law is amenable to formal modeling, and in what ways computers might assist legal thinking and practice. The book is the result of discussions held by the Group over two and half years. It will help students and researchers from different backgrounds to focus on a common set of topics of increasing general interest. It embodies the results of work in progress and suggests many issues for further discussion. A stimulating text for undergraduate and graduate courses in law, philosophy and computer science departments, as well as for those interested in the place of computers in legal practice, especially at the international level.

This book is a revised and extended version of my PhD Thesis 'Logical Tools for Modelling Legal Argument', which I defended on 14 January 1993 at the Free University Amsterdam. The first five chapters of the thesis have remained almost completely unchanged but the other chapters have undergone considerable revision and expansion. Most importantly, I have replaced the formal argument-based system of the old Chapters 6, 7 and 8 with a revised and extended system, whieh I have developed during the last three years in collaboration with Giovanni Sartor. Apart from some technical improvements, the main additions to the old system are the enriehment of its language with a nonprovability operator, and the ability to formalise reasoning about preference criteria. Moreover, the new system has a very intuitive dialectieal form, as opposed to the rather unintuitive fixed-point appearance of the old system. Another important revision is the split of the old Chapter 9 into two new chapters. The old Section 9. 1 on related research has been updated and expanded into a whole chapter, while the rest of the old chapter is now in revised form in Chapter 10. This chapter also contains two new contributions, a detailed discussion of Gordon's Pleadings Game, and a general description of a multi-Iayered overall view on the structure of argu mentation, comprising a logieal, dialectical, procedural and strategie layer. Finally, in the revised conclusion I have paid more attention to the relevance of my investigations for legal philosophy and argumentation theory.

Sebastian Rödl undermines a foundational dogma of contemporary philosophy: that knowledge, in order to be objective, must be knowledge of something that is as it is, independent of being known to be so. This profound work revives the thought that knowledge, precisely on account of being objective, is self-knowledge: knowledge knowing itself.

Duncan Pritchard offers an account of perceptual knowledge, arguing that it is paradigmatically constituted by true belief that enjoys rational support which is reflectively accessible to the agent. This resolves the issue between intermalism and externalism, and poses a radical challenge to contemporary epistemology.

Radical Skepticism and the Shadow of Doubt brings something new to epistemology both in content and style. At the outset we are asked to imagine a person named Vatol who grows up in a world containing numerous people who are brains-in-vats and who hallucinate their entire lives. Would Vatol have reason to doubt whether he himself is in contact with reality? If he does have reason to doubt, would he doubt, or is it impossible for a person to have such doubts? And how do we ourselves compare to Vatol? After reflection, can we plausibly claim that Vatol has reason to doubt, but we don't? These are the questions that provide the novel framework for the debates in this book. Topics that are treated here in significantly new ways include: the view that we ought to doubt only when we philosophize; epistemological “dogmatism”; and connections between radical doubt and “having a self.” The book adopts the innovative form of a “dialogue/play.” The three characters, who are Talmud students as well as philosophers, hardly limit themselves to pure philosophy, but regale each other with Talmudic allusions, reminiscences, jokes, and insults. For them the possibility of doubt emerges as an existential problem with potentially deep emotional significance. Setting complex arguments about radical skepticism within entertaining dialogue, this book can be recommended for both beginners and specialists.

The Oxford Handbook of the Philosophy of Perception is a survey by leading philosophical thinkers of contemporary issues and new thinking in philosophy of perception. It includes sections on the history of the subject, introductions to contemporary issues in the epistemology, ontology and aesthetics of perception, treatments of the individual sense modalities and of the things we perceive by means of them, and a consideration of how perceptual information is integrated and consolidated. New analytic tools and applications to other areas of philosophy are discussed in depth. Each of the forty-five entries is written by a leading expert, some collaborating with younger figures; each seeks to introduce the reader to a broad range of issues. All contain new ideas on the topics covered; together they demonstrate the vigour and innovative zeal of a young field. The book is accessible to anybody who has an intellectual interest in issues concerning perception.