Groff's argument runs counter to the familiar anti-metaphysical habit. Social and political philosophy, she maintains, is not as metaphysically neutral as it may seem. Even the most deontological of theories connects up with an attendant set of philosophical commitments regarding what kinds of things exist, as a fundamental ontological matter, and what they are like. These are topics of interest not just to social and political philosophers, but to social scientists and to philosophers of social science as well. "Ruth Groff has broken new ground in demonstrating the connection between social and political thought and the ontology of causal powers. Her account of the structure of Humean thinking about agency is excellent. Especially significant is the role that she assigns to Kantianism in the analysis that she develops. She moves effortlessly between contemporary metaphysics, political theory, critical social theory, and the history of modern philosophy, offering trenchant insights along the way into the work of thinkers ranging from Hume himself to Mill, Adorno, and Martha Nussbaum, and into debates over agent causation and emergence. There is even a discussion, in the final chapter, of Spinoza. This is big-picture philosophy at its best: rigorous and exacting at the level of detail; original, compelling and systematic in the whole." - Stephen Mumford, Professor of Metaphysics and Dean of the Faculty of Arts, University of Nottingham

Groff's argument runs counter to the familiar anti-metaphysical habit. Social and political philosophy, she maintains, is not as metaphysically neutral as it may seem. Even the most deontological of theories connects up with an attendant set of philosophical commitments regarding what kinds of things exist, as a fundamental ontological matter, and what they are like. These are topics of interest not just to social and political philosophers, but to social scientists and to philosophers of social science as well. "Ruth Groff has broken new ground in demonstrating the connection between social and political thought and the ontology of causal powers. Her account of the structure of Humean thinking about agency is excellent. Especially significant is the role that she assigns to Kantianism in the analysis that she develops. She moves effortlessly between contemporary metaphysics, political theory, critical social theory, and the history of modern philosophy, offering trenchant insights along the way into the work of thinkers ranging from Hume himself to Mill, Adorno, and Martha Nussbaum, and into debates over agent causation and emergence. There is even a discussion, in the final chapter, of Spinoza. This is big-picture philosophy at its best: rigorous and exacting at the level of detail; original, compelling and systematic in the whole." - Stephen Mumford, Professor of Metaphysics and Dean of the Faculty of Arts, University of Nottingham

Ontological commitment implies that each theory is supposed to specify the type of entities that form its components. Representatives of a theory share an ontological commitment in relation to the objects they refer to. There are theories that admit the existence of universals while others do not. As there are different ways of speaking about universals it is necessary to decide what a universal term corresponds to. It is essential to have a criterion that enables us to decide which kinds of objects are allowed as references for the terms used. In this volume two different approaches are discussed: first, in cases where only extensional languages are accepted; second, when intensional elements are required to determine the meaning such terms as "Sachverhalt", intentional statements or representations. The ontological commitment associated with extensional theories exclusively admits the existence of physical objects, whereas intensional theses additionally include universal and abstract entities. The study of ontological commitment enables us to measure the ontological economy of theories. This serves as a basis for the choice of theory. The authors of this volume discuss relevant issues of both models and provide new solutions.

What is the nature of the material world? And how are its fundamental constituents to be described? These questions are of central concern to contemporary philosophers, and in their attempt to answer them, they have begun reconsidering traditional views about metaphysical structure, including the Aristotelian view that material objects are best described as 'hylomorphic compounds'--that is, objects composed of both matter (hyle) and form (morphe). In this major new study, Jeffrey E. Brower presents and explains the hylomorphic conception of the material world developed by Thomas Aquinas, the most influential Aristotelian of the Middle Ages. According to Brower, the key to understanding Aquinas's conception lies in his distinctive account of intrinsic change. Beginning with a novel analysis of this account, Brower systematically introduces all the elements of Aquinas's hylomorphism, showing how they apply to material objects in general and human beings in particular. The resulting picture not only sheds new light on Aquinas's ontology as a whole, but provides a wholesale alternative to the standard contemporary accounts of material objects. In addition to presenting and explaining Aquinas's views, Brower seeks wherever possible to bring them into dialogue with the best recent literature on related topics. Along the way, he highlights the contribution that Aquinas's views make to a host of contemporary metaphysical debates, including the nature of change, composition, material constitution, the ontology of stuff vs. things, the proper analysis of ordinary objects, the truthmakers for essential vs. accidental predication, and the metaphysics of property possession.

E. J. Lowe sets out and defends his theory of what there is. His four-category ontology is a metaphysical system that recognizes two fundamental categorial distinctions which cut across each other to generate four fundamental ontological categories. The distinctions are between the particular and the universal and between the substantial and the non-substantial. The four categories thus generated are substantial particulars, non-substantial particulars, substantial universals andnon-substantial universals. Non-substantial universals include properties and relations, conceived as universals. Non-substantial particulars include property-instances and relation-instances, otherwise known as non-relational and relational tropes or modes. Substantial particulars include propertiedindividuals, the paradigm examples of which are persisting, concrete objects. Substantial universals are otherwise known as substantial kinds and include as paradigm examples natural kinds of persisting objects.This ontology has a lengthy pedigree, many commentators attributing it to Aristotle on the basis of certain passages in his apparently early work, the Categories. At various times during the history of Western philosophy, it has been revived or rediscovered, but it has never found universal favour, perhaps on account of its apparent lack of parsimony as well as its commitment to universals. In pursuit of ontological economy, metaphysicians have generally preferred to recognize fewerthan four fundamental ontological categories. However, Occam's razor stipulates only that we should not multiply entities beyond necessity; Lowe argues that the four-category ontology has an explanatory power unrivalled by more parsimonious systems, and that this counts decisively in its favour. He shows thatit provides a powerful explanatory framework for a unified account of causation, dispositions, natural laws, natural necessity and many other related matters, such as the semantics of counterfactual conditionals and the character of the truthmaking relation. As such, it constitutes a thoroughgoing metaphysical foundation for natural science.

“A marvelously entertaining, historical romp through the unexpected connections between mathematics and mysticism” (Paul Hoffman, Discover). From the mysterious cult of Pythagoras to the awesome mechanics of Stonehenge to digitally generated “gargoyles” and fractals, mathematics has always been a powerful, even divine force in the world. In a lively, intelligent synthesis of math, mysticism, and science fiction, Clifford Pickover explains the eternal magic of numbers. Taking a uniquely humorous approach, he appoints readers “Chief Historian” of an intergalactic museum and sends them, along with a quirky cast of characters, hurtling through the ages to explore how individuals used numbers for such purposes as predicting the end of the world, finding love, and winning wars.

The burgeoning field of youth studies encompasses multiple viewpoints, presenting a confusing picture to novices and experts alike. This insightful text goes to the heart of the fundamental issues and debates that characterize this developing field, giving readers a clearer understanding of its current progress and future prospects. James Côté's lively, debate-focused overview of the underlying paradigms and theories in youth studies - drawn from the overlapping disciplines of sociology, psychology and cultural studies – functions both as an introduction to the area and as an exercise in critical thinking, putting its readers on the cutting-edge of the field. The chapters move from identifying the key 'threshold meta-concepts' that influence research, to showing readers how to critically evaluate key debates in areas that are central to students' lives, including education, work, family, technologies, youth culture, identity and politics. Youth Studies is the ideal companion to youth-related degree programmes and to youth modules in sociology, social work, social policy, psychology and other related disciplines.