This paper is about a special version of PDL, proposed by Marcus Kracht, for reasoning about sibling ordered trees. It has four basic programs corresponding to the child, parent, left- and right-sibling relations in such trees. The original motivation for this language is rooted in the field of model-theoretic syntax. Motivated by recent developments in the area of semi-structured data, and, especially, in the field of query languages for XML (eXtensible Markup Language) documents, we revisit the language. This renewed interest (...) comes with a special focus on complexity and expressivity aspects of the language, aspects that have so far largely been ignored. We survey and derive complexity results, and spend most of the paper on the most important open question concerning the language: what is its expressive power? We approach this question from two angles: Which first-order properties can be expressed? And which second-order properties? While we are still some way from definitive answers to these questions, we discuss two first-order fragments of the PDL language for ordered trees, and show how the language can be used to express some typical (second-order) problems, like the boolean circuit and the frontier problem. (shrink)

Bertrand Russell was one of the greatest logicians since Aristotle, and one of the most important philosophers of the past two hundred years. As we approach the 125th anniversary of the Nobel laureate's birth, his works continue to spark debate, resounding with unmatched timeliness and power. The Problems of Philosophy, one of the most popular works in Russell's prolific collection of writings, has become core reading in philosophy. Clear and accessible, this little book is an intelligible and stimulating guide (...) to those problems of philosophy which often mistakenly lead to its status as too lofty and abstruse for the lay mind. Focusing on problems he believes will provoke positive and constructive discussion, Russell concentrates on knowledge rather than metaphysics, steering the reader through his famous 1910 distinction between "knowledge by acquaintance and knowledge by description," and introducing important theories of Descartes, Kant, Hegel, Hume, Locke, Plato, and others to lay the foundation for philosophical inquiry by general readers and scholars alike.With a new introduction by John Perry, this valuable work is a perfect introduction to the field and will continue to stimulate philosophical discussion as it has done for nearly forty years. (shrink)

By a `denoting phrase' I mean a phrase such as any one of the following: a man, some man, any man, every man, all men, the present King of England, the present King of France, the center of mass of the solar system at the first instant of the twentieth century, the revolution of the earth round the sun, the revolution of the sun round the earth. Thus a phrase is denoting solely in virtue of its form. We may distinguish (...) three cases: (1) A phrase may be denoting, and yet not denote anything; e.g., `the present King of France'. (2) A phrase may denote one definite object; e.g., `the present King of England' denotes a certain man. (3) A phrase may denote ambiguously; e.g. `a man' denotes not many men, but an ambiguous man. The interpretation of such phrases is a matter of considerably difficulty; indeed, it is very hard to frame any theory not susceptible of formal refutation. All the difficulties with which I am acquainted are met, so far as I can discover, by the theory which I am about to explain. (shrink)

This brilliant and controversial work investigates the relationship between 'individual' and 'scientific' knowledge.

Published in 1903, this book was the first comprehensive treatise on the logical foundations of mathematics written in English. It sets forth, as far as possible without mathematical and logical symbolism, the grounds in favour of the view that mathematics and logic are identical. It proposes simply that what is commonly called mathematics are merely later deductions from logical premises. It provided the thesis for which _Principia Mathematica_ provided the detailed proof, and introduced the work of Frege to a wider (...) audience. In addition to the new introduction by John Slater, this edition contains Russell's introduction to the 1937 edition in which he defends his position against his formalist and intuitionist critics. (shrink)

This anthology is a thorough introduction to classic literature for those who have not yet experienced these literary masterworks. For those who have known and loved these works in the past, this is an invitation to reunite with old friends in a fresh new format. From Shakespeare's finesse to Oscar Wilde's wit, this unique collection brings together works as diverse and influential as The Pilgrim's Progress and Othello. As an anthology that invites readers to immerse themselves in the masterpieces of (...) the literary giants, it is must-have addition to any library. (shrink)

First published in 1903, _Principles of Mathematics_ was Bertrand Russell’s first major work in print. It was this title which saw him begin his ascent towards eminence. In this groundbreaking and important work, Bertrand Russell argues that mathematics and logic are, in fact, identical and what is commonly called mathematics is simply later deductions from logical premises. Highly influential and engaging, this important work led to Russell’s dominance of analytical logic on western philosophy in the twentieth century.

Immensely intelligible, thought-provoking guide by Nobel prize-winner considers such topics as the distinction between appearance and reality, the existence and nature of matter, idealism, inductive logic, intuitive knowledge, many other subjects. For students and general readers, there is no finer introduction to philosophy than this informative, affordable and highly readable edition that is "concise, free from technical terms, and perfectly clear to the general reader with no prior knowledge of the subject."—The Booklist of the American Library Association.

An unabridged edition with updated footnotes and layout, to include: Recent Criticisms of "Consciousness" - Instinct and Habit - Desire and Feeling - Influence of Past History on Present Occurrences in Living Organisms - Psychological and Physical Causal Laws - Introspection - The Definition of Perception - Sensations and Images - Memory - Words and Meaning - General Ideas and Thought - Belief - Truth and Falsehood - Emotions and Will - Characteristics of Mental Phenomena.

The Problems of Philosophy is a 1912 book by Bertrand Russell, in which Russell attempts to create a brief and accessible guide to the problems of philosophy. Focusing on problems he believes will provoke positive and constructive discussion, Russell concentrates on knowledge rather than metaphysics: If it is uncertain that external objects exist, how can we then have knowledge of them but by probability. There is no reason to doubt the existence of external objects simply because of sense data. (...) Russell guides the reader through his famous 1910 distinction between knowledge by acquaintance and knowledge by description and introduces important theories of Plato, Aristotle, René Descartes, David Hume, John Locke, Immanuel Kant, Georg Wilhelm Friedrich Hegel and others to lay the foundation for philosophical inquiry by general readers and scholars alike. "In the following pages I have confined myself in the main to those problems of philosophy in regard to which I thought it possible to say something positive and constructive, since merely negative criticism seemed out of place. For this reason, theory of knowledge occupies a larger space than metaphysics in the present volume, and some topics much discussed by philosophers are treated very briefly, if at all. (shrink)

The titile essay of this collection suggests that Bertrand Russell's lifelong preoccupation: the disentanglement, with ever-increasing precision, of what is subjective or intellectualy cloudy from what is objective or capable of logical demonstration. The first five essays he calls 'entirely popular': they include two on the revolutionary changes in mathematics in the last hundred years, and one on the value of science in human culture. The last five, 'somewhat more technical', are concerned with particular problems of philosophy: the ultimate (...) nature of matter, the connection between the sense-data and physics, the problem of casuality and different ways of knowing. In these one can see the Russell method in operation, intellectual analysis dissecting the problem to its bare bones. (shrink)

Ten brilliant essays on logic appear in this collection, the work of one of the world’s best-known authorities on logic. In these thought-provoking arguments and meditations, Nobel Prize winner Bertrand Russell challenges the romantic mysticism of the 19th century, positing instead his theory of logical atomism. These essays are categorized by Russell as "entirely popular" and "somewhat more technical." The former include the well-known title essay plus "A Free Man’s Worship" and "The Place of Science in a Liberal Education"; (...) the latter comprise "On the Notion of Cause" and "Knowledge by Acquaintance and Knowledge by Description," along with other essays written in the cogent and witty style for which their author is justly renowned. (shrink)

By what process of development he came to this opinion, though in itself an important and interesting question, is logically irrelevant to the inquiry how far the opinion itself is correct ; and among his opinions, when these have been ascertained, it becomes desirable to prune away such as seem inconsistent with his main doctrines, before those doctrines themselves are subjected to a critical scrutiny. Philosophic truth and falsehood, in short, rather than historical fact, are what primarily demand our attention (...) in this inquiry. (shrink)

This volume of Bertrand Russell's Collected Papers finds Russell focused on writing Principia Mathematica during 1905–08. Eight previously unpublished papers shed light on his different versions of a substitutional theory of logic, with its elimination of classes and relations, during 1905-06. A recurring issue for him was whether a type hierarchy had to be part of a substitutional theory. In mid-1907 he began writing up the final version of Principia , now using a ramified theory of types, and eleven (...) unpublished drafts from 1907-08 deal with this. Numerous letters show his thoughts on the process. The volume's 80-page introduction covers the evolution of his logic from 1896 until 1909, when volume I of Principia went to the printer. (shrink)

One of Russell's most important and interesting books which reconciles the materialistic tendency of psychology with the anti-materialistic tendency of physics.

El autor intenta mostrar que el concepto de ley es totalmente innecesario y que solo sirve para crear confusiones y generar falacias. Para ello muestra que la supuesta “ley de la causalidad” es inconsistente y que la ciencia no requiere de ella más que en una primera fase. Las ciencias maduras usan relaciones, en concreto, relaciones mediante ecuaciones diferenciales para desempe\ nar el papel que se le quiere otorgar a la ley de la causalidad. Despues de hacer esto, el autor (...) presenta varias confusiones relacionadas con el concepto de causa, y su solución si se asume lo anteriormente dicho. (shrink)

Philosophy, from the earliest times, has made greater claims, and achieved fewer results, than any other branch of learning. In Our Knowledge of the External World , Bertrand Russell illustrates instances where the claims of philosophers have been excessive, and examines why their achievements have not been greater.

The Conquest of Happiness is Bertrand Russell’s recipe for good living. First published in 1930, it pre-dates the current obsession with self-help by decades. Leading the reader step by step through the causes of unhappiness and the personal choices, compromises and sacrifices that lead to the final, affirmative conclusion of ‘The Happy Man’, this is popular philosophy, or even self-help, as it should be written.

First published in 1984. Routledge is an imprint of Taylor & Francis, an informa company.

`Mr Russell's very brilliant criticism of Leibniz ... is a piece of controversial philosophy as well as a contribution to history.' - Bernard Bosanquet.

One of Russell's most important and interesting books which reconciles the materialistic tendency of psychology with the anti-materialistic tendency of physics.

Brieven van de Engelse wijsgeer (1872-1970) uit de periode 1884-1914.

Al Seckel has rescued many of Bertrand Russell's best essays on religion, free thought, and nationalism from their resting places in obscure pamphlets, hard-to-find books, and out-of print periodicals to form a superb compilation.

In Collected Papers 21 Bertrand Russell grapples with the dilemma that confronted all opponents of militarism and war in the 1930s—namely, what was the most politically and morally appropriate response to international aggression. How to Keep the Peace contains some of Russell’s best-known essays, such as the famous Auto-obituary and his treatment of The Superior Virtue of the Oppressed . Like the sixteen previous volumes in Routledge’s critical edition of Russell’s shorter writings, however, Collected Papers 21 also includes a (...) number of unpublished manuscripts from the Bertrand Russell Archives at McMaster University. Moreover, it recovers for Russell scholars and general readers alike a rich vein of material that has previously appeared in print only in obscure or long-defunct newspaper and periodical publications. (shrink)

During the First World War, Bertrand Russell was political commentator for The Tribunal , the official weekly publication of the No-Conscription Fellowship, of which Russell was Action Chairman. This volume contains many short papers from that period, which reflect Russell's immediate reponses to developments in the conflict. These documents bear witness to Russell's growing commitment to pacifism, and reveal the development of the patterns of political argument, rhetoric and activism which were to characterise his work throughout his life.

Détente or Destruction, 1955-57 continues publication of Routledge's multi-volume critical edition of Bertrand Russell's shorter writings. Between September 1955 and November 1957 Russell published some sixty-one articles, reviews, statements, contributions to books and letters to editors, over fifty of which are contained in this volume. The texts, several of them hitherto unpublished, reveal the deepening of Russell's commitment to the anti-nuclear struggle, upon which he embarked in the previous volume of Collected Papers ( Man's Peril, 1954-55 ). Continuing with (...) the theme of nuclear peril, this volume contains discussion of nuclear weapons, world peace, prospects for disarmament and British-Soviet friendship against the backdrop of the Cold War. One of the key papers in this volume is Russell's message to the inaugural conference of the Pugwash movement, which Russell was instrumental in launching and which became an influential, independent forum of East-West scientific cooperation and counsel on issues as an internationally agreed nuclear test-ban. In addition to the issues of war and peace, Russell, now in his eighties, continued to take an interest in a wide variety of themes. Russell not only addresses older controversies over nationalism and empire, religious belief and American civil liberties, he also confronts head-on the new and pressing matters of armed intervention in Hungary and Suez, and of the manufacture and testing of the British hydrogen bomb. This volume includes seven interviews ranging from East-West Relations after the Geneva conference to a Meeting with Russell. (shrink)

This volume collects together Russell's philosophical writings during the period from 1947-68. For about half of this period Russell worked steadily at philosophy but after the publication of My Philosophical Development in 1959 he retired from academic philosophy for the second time. After that date, only the occasional philosophical piece appeared, as he was preoccupied with political writings. In this volume there are a handful of papers dated later than 1959, and all of these were certainly written by Russell himself. (...) This volume contains Russell's writings on diverse philosophical interests, including autobiographical and self-critical papers, critiques of other philosophers and his controversial opinions on Christianity. (shrink)

The Collected Papers 28 signals reinvigoration of Russell the public campaigner. The title of the volume is taken from one of his most famous and eloquent short essays and probably the best known of his many broadcasts for the BBC. Man's Peril, 1954-55 not only captures the essence of Russell's thinking about nuclear weapons and the Cold War in the mid-1950s, its extraordinary impact served to jolt him into political protest once again. The activism of which we glimpse the initial (...) stirrings in this volume continued in various guises more or less without interruption until his death. In the writings assembled in this volume, however, he is looking towards the non-aligned states and world scientific opinion as possible brokers of détente . (The volume includes Russell's famous public statement, the declaration of scientists known as 'The Russell Einstein Manifesto'.) Although Russell was becoming increasingly immersed in work for peace, this was not to the exclusion of all other interests. For example, here we find also him reminiscing about his peace campaigning during the First World War, defending 'History as an Art', and attacking the obscurantism of obscenity legislation and the opponents of birth control. (shrink)

First published in 1985. Routledge is an imprint of Taylor & Francis, an informa company.

_The Conquest of Happiness_ is Bertrand Russell’s recipe for good living. First published in 1930, it pre-dates the current obsession with self-help by decades. Leading the reader step by step through the causes of unhappiness and the personal choices, compromises and sacrifices that lead to the final, affirmative conclusion of ‘The Happy Man’, this is popular philosophy, or even self-help, as it should be written.

Russell on Religion presents a comprehensive and accessible selection of Bertrand Russell's writing on religion and related topics from the turn of the century to the end of his life. The influence of religion pervades almost all Bertrand Russell's writings from his mathematical treatises to his early fiction. This comprehensive selection of writings offers a clear overview of the development of his thinking about religion. Russell contends with religion as a philosopher, historian, social critic and private individual. The (...) selections papers are arranged chronologically, and span Russell's thinking with his personal statements, and his views on religion and philosophy, religion and science, religion and morality and religion and history. This collection shows the development and diversity of Russell's thinking on religion and exposes the reader to all aspects of his work on this subject. (shrink)

_The Conquest of Happiness_ is Bertrand Russell’s recipe for good living. First published in 1930, it pre-dates the current obsession with self-help by decades. Leading the reader step by step through the causes of unhappiness and the personal choices, compromises and sacrifices that lead to the final, affirmative conclusion of ‘The Happy Man’, this is popular philosophy, or even self-help, as it should be written.

In this volume of essays Russell is concerned to combat, in one way or another, the growth of dogmatism, whether of the Left or of the Right, which has hitherto ...

'These propositions may seem mild, yet, if accepted, they would absolutely revolutionize human life.' With these words Bertrand Russell introduces what is indeed a revolutionary book. Taking as his starting-point the irrationality of the world, he offers by contrast something 'wildly paradoxical and subversive' Sceptical Essays has never been out of print since its first publication in 1928. Today, besieged as we are by the numbing onslaught of twenty-first-century capitalism, Russell's defense of scepticism and independence of mind is as (...) timely as ever. In clear, engaging prose, he guides us through the key philosophical issues that affect our daily life. (shrink)

" The supreme principle, both in politics and in private life, should be to promote all that is creative, and so to diminish the impulses and desires that center round possession." This book, originally entitled Why Men Fight, is generally seen as the fullest expression of Bertrand Russell's political philosophy. Russell argues that after the experience of the Great War the individualistic approach of traditional liberalism had reached its limits. Political theory must be based on the motivated forces of (...) creativity and impulse rather than on competition. The ideas expressed in Principles of Social Reconstruction have greatly contributed to Russell's fame as a social critic and anti-war activist. The introduction by Richard Rempel locates them in the context of Russell's other writings and show that neither his ideas nor his language have lost their force and topicality over the years. (shrink)

Les mots nous manquent pour dire le plus banal des paysages. Vite à court de phrases, nous sommes incapables de faire le portrait d'une orée. Un pré, déjà, nous met à la peine, que grêlent l'aigremoine, le cirse et l'ancolie. Il n'en a pourtant pas toujours été ainsi. Au temps de Goethe et de Humboldt, le rêve d'une " histoire naturelle " attentive à tous les êtres, sans restriction ni distinction aucune, s'autorisait des forces combinées de la science et de (...) la littérature pour élever la " peinture de paysage " au rang d'un savoir crucial. La galaxie et le lichen, l'enfant et le papillon voisinaient alors en paix dans un même récit. Ce n'est pas que l'homme comptait peu : c'est que tout comptait infiniment. Des croquis d'Alfred Wallace aux " proêmes " de Francis Ponge, des bestiaires de William Swainson aux sonnets de Rainer Maria Rilke, ce livre donne à entendre le chant, aussi tenace que ténu, d'un très ancien savoir sur le monde - un savoir qui répertorie les êtres par concordances de teintes et de textures, compose avec leurs lueurs des dictionnaires éphémères, s'abîme et s'apaise dans le spectacle de leurs métamorphoses. (shrink)

Even children have asked: Who am I? How should I live? What does life mean? Almost everyone seeks the answer to these questions at one time or another. This rewarding series for young adults presents four well-known thinkers and their ideas on these profound issues.