The justification of Bayes' rule by cognitive rationality principles is undertaken by extending the propositional axiom systems usually proposed in two contexts of belief change: revising and updating. Probabilistic belief change axioms are introduced, either by direct transcription of the set-theoretic ones, or in a stronger way but nevertheless in the spirit of the underlying propositional principles. Weak revising axioms are shown to be satisfied by a General Conditioning rule, extending Bayes' rule but also compatible with others, and weak updating (...) axioms by a General Imaging rule, extending Lewis' rule. Strong axioms (equivalent to the Miller–Popper axiom system) are necessary to justify Bayes' rule in a revising context, and justify in fact an extended Bayes' rule which applies, even if the message has zero probability. (shrink)

The justification of Bayes' rule by cognitive rationality principles is undertaken by extending the propositional axiom systems usually proposed in two contexts of belief change: revising and updating. Probabilistic belief change axioms are introduced, either by direct transcription of the set-theoretic ones, or in a stronger way but nevertheless in the spirit of the underlying propositional principles. Weak revising axioms are shown to be satisfied by a General Conditioning rule, extending Bayes' rule but also compatible with others, and weak updating (...) axioms by a General Imaging rule, extending Lewis' rule. Strong axioms (equivalent to the Miller–Popper axiom system) are necessary to justify Bayes' rule in a revising context, and justify in fact an extended Bayes' rule which applies, even if the message has zero probability. (shrink)

Despite its importance in various fields, analogical reasoning has not yet received a unified formal representation. Our contribution proposes a general scheme of inference that is compatible with different types of logic (deductive, probabilistic, non-monotonic). Firstly, analogical assessment precisely defines the similarity of two objects according to their properties, in a relative rather than absolute way. Secondly, analogical inference transfers a new property from one object to a similar one, thanks to an over-hypothesis linking two sets of properties. The belief (...) strength in the conclusion is then directly related to the belief strength in this meta-hypothesis. (shrink)

Abduction was first introduced in the epistemological context of scientific discovery. It was more recently analyzed in artificial intelligence, especially with respect to diagnosis analysis or ordinary reasoning. These two fields share a common view of abduction as a general process of hypotheses formation. More precisely, abduction is conceived as a kind of reverse explanation where a hypothesis H can be abduced from events E if H is a good explanation of E. The paper surveys four known schemes for abduction (...) that can be used in both fields. Its first contribution is a taxonomy of these schemes according to a common semantic framework based on belief revision. Its second contribution is to produce, for each non-trivial scheme, a representation theorem linking its semantic framework to a set of postulates. Its third contribution is to present semantic and axiomatic arguments in favor of one of these schemes, ordered abduction, which has never been vindicated in the literature. (shrink)

Two main schemes explain how a system adapts to its environment. Evolutionary models are grounded on three usual processes (variation, transmission, selection) acting at the population level. Learning models are concerned with the endogenous search for a better performance at the individual level. The first ones were initially favored by biology and the second well illustrated by game theory. The article examines first how game theory went to evolution and how biology later considered learning. It shows some examples of a (...) hybrid use of models of each type. It finally proposes a common framework for both types of models. (shrink)

The Sleeping Beauty problem is presented in a formalized framework which summarizes the underlying probability structure. The two rival solutions proposed by Elga and Lewis differ by a single parameter concerning her prior probability. They can be supported by considering, respectively, that Sleeping Beauty is “fuzzy-minded” and “blank-minded”, the first interpretation being more natural than the second. The traditional absent -minded driver problem is reinterpreted in this framework and sustains Elga’s solution.

L’article propose d’abord une version simplifiée d’une ontologie universelle, conçue comme un cadre général de description du monde matériel et mental. Il examine les notions d’entité, de propriété, de relation et de temporalité et leurs développements conjoints en termes de rapport entre les parties et le tout ou encore d’émergence d’une entité nouvelle. Il illustre ensuite les principes précédents en ce qui concerne la science économique, dont les entités de base sont les agents, les biens et les institutions. Il insiste (...) sur le couplage que cette dernière réalise entre leurs propriétés physiques ou psychologiques et le raisonnement qu’elle propose en termes d’équilibre et plus récemment d’apprentissage. Classification JEL : A12. (shrink)

RésuméEn dépit de son importance dans divers domaines, le raisonnement analogique n'a pas encore reçu de représentation formelle unifiée. Notre contribution propose un schéma d'inférence général, compatible avec différentes logiques (déductive, probabiliste, non monotone). Premièrement, un énoncé analogique définit précisément la similarité entre deux objets en fonction de leurs propriétés, de façon relative et non absolue. Deuxièmement, une inférence analogique transfère une propriété nouvelle d'un objet à un objet similaire, grâce à une hypothèse d'arrière-plan qui relie deux ensembles de propriétés. (...) Le degré de croyance dans la conclusion est alors directement relié au degré de croyance dans cette méta-hypothèse. (shrink)

The paper studies a specific adaptive learning rule when each player faces a unidimensional strategy set. The rule states that a player keeps on incrementing her strategy in the same direction if her utility increased and reverses direction if it decreased. The paper concentrates on games on the square [0,1]×[0,1]\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$[0,1]\times [0,1]$$\end{document} as mixed extensions of 2×2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$2\times 2$$\end{document} games. We study in general the (...) behavior of the system in the interior as well as on the borders of the strategy space. We then describe the system asymptotic behavior for symmetric, zero-sum, and twin games. Original patterns emerge. For instance, for the “prisoner’s dilemma” with symmetric initial conditions, the system goes directly to the symmetric Pareto optimum. For “matching pennies,” the system follows slowly expanding cycles around the mixed strategy equilibrium. (shrink)

In the mid twentieth century the philosopher Ludwig Wittgenstein famously asserted that games are indefinable; there are no common threads that link them all. "Nonsense," says the sensible Bernard Suits: "playing a game is a voluntary attempt to overcome unnecessary obstacles." The short book Suits wrote demonstrating precisely that is as playful as it is insightful, as stimulating as it is delightful. Suits not only argues that games can be meaningfully defined; he also suggests that playing games is a (...) central part of the ideal of human existence, so games belong at the heart of any vision of Utopia. Originally published in 1978, The Grasshopper is now re-issued with a new introduction by Thomas Hurka and with additional material (much of it previously unpublished) by the author, in which he expands on the ideas put forward in The Grasshopper and answers some questions that have been raised by critics. (shrink)

How I became a philosopher -- To love, to love me, to love us.

This paper explores a remarkable convergence of ideas and evidence, previously presented in separate places by its authors. That convergence has now become so persuasive that we believe we are working within substantially the same broad framework. Taylor's mathematical papers on neuronal systems involved in consciousness dovetail well with work by Newman and Baars on the thalamocortical system, suggesting a brain mechanism much like the global workspace architecture developed by Baars (see references below). This architecture is relational, in the sense (...) that it continuously mediates the interaction of input with memory. While our approaches overlap in a number of ways, each of us tends to focus on different areas of detail. What is most striking, and we believe significant, is the extent of consensus, which we believe to be consistent with other contemporary approaches by Weiskrantz, Gray, Crick and Koch, Edelman, Gazzaniga, Newell and colleagues, Posner, Baddeley, and a number of others. We suggest that cognitive neuroscience is moving toward a shared understanding of consciousness in the brain. (shrink)

Conscious experience is one of the most difficult and thorny problems in psychological science. Its study has been neglected for many years, either because it was thought to be too difficult, or because the relevant evidence was thought to be poor. Bernard Baars suggests a way to specify empirical constraints on a theory of consciousness by contrasting well-established conscious phenomena - such as stimulus representations known to be attended, perceptual, and informative - with closely comparable unconscious ones - such (...) as stimulus representations known to be preperceptual, unattended, or habituated. Adducing data to show that consciousness is associated with a kind of global workplace in the nervous system, and that several brain structures are known to behave in accordance with his theory, Baars helps to clarify many difficult problems. (shrink)

An updated and expanded successor to Culver and Gert's Philosophy in Medicine, this book integrates moral philosophy with clinical medicine to present a comprehensive summary of the theory, concepts, and lines of reasoning underlying the ...

I. Réviser pour développer. 1. Du modèle bergsonien à la révision bergsonienne -- 2. De la révision bergsonienne au développement rationnel -- II. La dialectique généralisée. 1. Réflexions sur les synthèses dialectiques fichtéennes -- 2. Réflexions sur Schelling au temps de l'idéalisme transcendantal -- 3. Réflexions sur les dialectiques hégéliennes -- III. Les dialectiques juridiques. 1. L'approbation du contrat social par Kant et Fichte -- 2. Le refus de contrat social par Hegel.

El presente artículo es una aproximación exploratoria a las redes de cuidados que están proliferando entre los vecinos de las grandes ciudades españolas como una reacción de la sociedad civil para acometer la crisis ocasionada por la COVID-19, que afecta actualmente a los hogares estructuralmente más vulnerables. Los efectos de la emergencia alimentaria sobrevenida como consecuencia de la pandemia tienen un fuerte componente socio-espacial, y ponen en cuestión el modelo de bienestar de la ciudad de Madrid, el caso en que (...) se centra el estudio. Examinaremos los orígenes de las redes de cuidados en la ciudad, su vinculación con el movimiento vecinal, y los efectos del cambio en el modelo de ciudad entre gobiernos conservadores y neo municipalistas. Analizaremos la estructura de las redes de cuidados, su actuación, y especialmente el posible papel de sus integrantes como actores políticos en la ciudad neoliberal, desde tres enfoques teóricos distintos: el de los movimientos sociales, el de la innovación social y el de la gobernanza urbana. (shrink)

The basic principles of scientific research from the great French physiologist whose contributions in the 19th century included the discovery of vasomotor nerves; nature of curare and other poisons in human body; more.

Hannah Arendt is famous for her influential and innovative analysis of totalitarianism. However, her thinking on political systems and ideologies is far from limited to this theorization. Arendt also criti-cizes modern liberalism and its ideological framework. Indeed, Arendt’s thought reveals many of the political consequences of world-lessness, the loss of the world in contemporary times, particularly in terms of a sense of disempowerment and the advent of a technical vision of politics. This article looks at the political effects of world-lessness, (...) exploring the emerging opposition between liberal post-politics and conservative hyper-politics. This critique of Arendt’s thought can help us better understand the issues and questions raised by liberalism. (shrink)

Si la raison moderne, declaree en son principe par Descartes comme libre affirmation personnelle de l'universel, generalise son application avec le projet rousseauiste d'une politique de la liberte, c'est dans l'ecartelement reconnu entre le volontarisme moral de celle-ci et le constat de son destin historique negatif. Depuis les deux revolutions marquees par l'heritage de Rousseau, celle, pratique, de 1789, et celle, theorique, de Kant, le developpement de la raison politique moderne est ordonne a la fondation et a la determination nouvelle (...) d'un droit essentiellement republicain. Les etudes composant le present recueil analysent les divers aspects et moments d'une telle raison politique moderne, de leur socle doctrinal a leur insertion historique. On s'est interroge notamment sur la signification concrete revetue par eux dans le contexte essentiellement francais, mais egalement europeen et mondial. (shrink)

Part I. Phenomenology -- Phenomenology and the return to beginnings -- Delimitations: phenomenology and the end of metaphysics -- Part II. Sallis's Plato interpretation -- Being and logos: reading the Platonic dialogues -- Chorology: on beginning in Plato's Timaeus -- Platonic legacies -- Part III. Art/Sallis -- Stone -- Shades-of painting at the limit -- Topographies -- Part IV. Sallis and other thinkers -- The gathering of reason -- Spacings-of reason and imagination in texts of Kant, Fichte, Hegel -- Echoes: (...) after Heidegger -- Crossings: Nietzsche and the space of tragedy -- Part V. Sallis speaks directly -- Double truth -- Force of imagination: the sense of the elemental -- On translation -- The Sallis/Derrida dialogue -- Derrida's "Tense" and Sallis's The verge of philosophy. (shrink)

We tend to suppose that the ancient Greeks had primitive ideas of the self, of responsibility, freedom, and shame, and that now humanity has advanced from these to a more refined moral consciousness. Bernard Williams's original and radical book questions this picture of Western history. While we are in many ways different from the Greeks, Williams claims that the differences are not to be traced to a shift in these basic conceptions of ethical life. We are more like the (...) ancients than we are prepared to acknowledge, and only when this is understood can we properly grasp our most important differences from them, such as our rejection of slavery. The author is a philosopher, but much of his book is directed to writers such as Homer and the tragedians, whom he discusses as poets and not just as materials for philosophy. At the center of his study is the question of how we can understand Greek tragedy at all, when its world is so far from ours. Williams explains how it is that when the ancients speak, they do not merely tell us about themselves, but about ourselves. _Shame and Necessity_ gives a new account of our relations to the Greeks, and helps us to see what ethical ideas we need in order to live in the modern world. (shrink)

This book contributes to current bioethical debates by providing a critical analysis of the philosophy of human death. Bernard N. Schumacher discusses contemporary philosophical perspectives on death, creating a dialogue between phenomenology, existentialism, and analytic philosophy. He also examines the ancient philosophies that have shaped our current ideas about death. His analysis focuses on three fundamental problems: (1) the definition of human death, (2) the knowledge of mortality and of human death as such, and (3) the question of whether (...) death is nothing to us or, on the contrary, whether it can be regarded as an absolute or relative evil. Drawing on scholarship published in four languages and from three distinct currents of thought, this volume represents a comprehensive and systematic study of the philosophy of death, one that provides a provocative basis for discussions of the bioethics of human mortality. (shrink)

A bold new interpretation of Aristotelian thought is central to Bernard Yack's provocative new book. He shows that for Aristotle, community is a conflict-ridden fact of everyday life, as well as an ideal of social harmony and integration. From political justice and the rule of law to class struggle and moral conflict, Yack maintains that Aristotle intended to explain the conditions of everyday political life, not just, as most commentators assume, to represent the hypothetical achievements of an idealistic "best (...) regime." By showing how Aristotelian ideas can provide new insight into our own political life, Yack makes a valuable contribution to contemporary discourse and debate. His work will excite interest among a wide range of social, moral, and political theorists. (shrink)

This book offers the fullest and most sophisticated account of Gert's influential moral theory, a model first articulated in the classic work The Moral Rules: A New Rational Foundation for Morality, published in 1970. In this final revision, Gert makes clear that the moral rules are only one part of an informal system that does not provide unique answers to every moral question but does always provide a range of morally acceptable options. A new chapter on reasons includes an account (...) of what makes one reason better than another and a second new chapter is devoted to the question of justifying violations of the rules. Moral impartiality, the moral ideals, and virtue and vice, are all treated in greater detail. Throughout, Gert attempts to answer all of the challenges that his work has provoked. (shrink)

Die "Paradoxien des Unendlichen" sind ein Klassiker der Philosophie der Mathematik und zugleich eine gute Einführung in das Denken des "Urgroßvaters" der analytischen Philosophie. Das Unendliche - seit jeher ein Faszinosum für die philosophische Reflexion - wurde in der Zeit nach der Grundlegung der Analysis durch Leibniz und Newton in der Mathematik zunächst als Problem betrachtet, das sich nicht vollkommen widerspruchsfrei behandeln lässt. Bernard Bolzano, der heute als "Urgroßvater der analytischen Philosophie" (Michael Dummett) gilt, zeigt in diesem klassisch gewordenen (...) Text jedoch, dass es beim Nachdenken über das Unendliche, sofern man begrifflich differenziert argumentiert und klare Definitionen zugrunde legt, keine echten Widersprüche gibt und sich die "Paradoxien des Unendlichen" auflösen lassen. Bolzano setzt sich zunächst mit den Unendlichkeitsbegriffen der Mathematik und der (idealistisch geprägten) Philosophie seiner Zeit auseinander, bevor er sich Schritt für Schritt die analytischen Grundlagen einer konsistenten Theorie des Unendlichen erarbeitet. Bereits einige Jahrzehnte vor Georg Cantors bis heute maßgeblicher mathematischer Unendlichkeitsdefinition gelingt Bolzano mit diesem Werk, dessen logische Klarheit und dessen Grad an philosophischer Durchdachtheit bis heute Beispielcharakter haben, die Rehabilitation des Unendlichen für die Philosophie der Mathematik. Die "Paradoxien des Unendlichen" wurden zuerst 1851 aus dem Nachlass herausgegeben. Diese Neuausgabe beruht auf dem der Erstausgabe zugrundeliegenden Manuskript. (shrink)

The Prague Philosopher Bernard Bolzano (1781-1848) has long been admired for his groundbreaking work in mathematics: his rigorous proofs of fundamental theorems in analysis, his construction of a continuous, nowhere-differentiable function, his investigations of the infinite, and his anticipations of Cantor's set theory. He made equally outstanding contributions in philosophy, most notably in logic and methodology. One of the greatest mathematician-philosophers since Leibniz, Bolzano is now widely recognised as a major figure of nineteenth-century philosophy. Praised by Husserl as “one (...) of the greatest logicians of all times,” he has also been recognised by Michael Dummett as one of the first modern analytic philosophers and by Alberto Coffa as the founder of the “semantic tradition.” This volume contains English translations of the essay “On the Mathematical Method,” a concise introduction to Bolzano’s logic and philosophy of mathematics, as well as substantial selections from his correspondence with Franz Exner, Professor of Philosophy at the Charles University in Prague in the 1830s and 40s. It will be of interest to students of Austrian philosophy, the development of analytic philosophy, the philosophy of language, and the history and philosophy of logic and mathematics. (shrink)

The problem of time involves an overlap between physics, philosophy, psychology and neuroscience. My talk will discuss the role of time in physics but also emphasize that physics may need to expand to address issues usually regarded as being in the other domains. I will first review the mainstream physics view of time, as it arises in Newtonian theory, relativity theory and quantum theory. I will then discuss the various arrows of time, the most fundamental of which is the passage (...) of time associated with consciousness. I will argue that this goes beyond both relativity theory and quantum theory, so that one needs some new physical paradigm to accommodate it. A new paradigm is required anyway to describe quantum gravity and this may elucidate the nature of both time and consciousness. (shrink)

?In everday language, the word ?attention? implies control of access to consciousness, and we adopt this usage here. Attention itself can be either voluntary or automatic. This can be readily modeled in the theory. Further, a contrastive analysis of spontaneously self?attributed vs. self?alien experiences suggests that ?self? can be interpreted as the more enduring, higher levels of the dominant context hierarchy, which create continuity over the changing flow of events. Since context is by definition unconscious in GW theory, self in (...) this sense is thought to be inherently unconscious as well. This proposal is consistent with a great deal of objective evidence. However, aspects of self may become known through ?conscious self-monitoring,? a process that ??is useful for self-evaluation and self?control. The results of conscious self-monitoring are combined with self?evaluation criteria, presumably of social origin, to produce a stable ?self?concept?, which functions as a supervisory system within the larger self organization. (shrink)

Can we make progress exploring consciousness? Or is it forever beyond human reach? In science we never know the ultimate outcome of the journey. We can only take whatever steps our current knowledge affords. This paper explores today's evidence from the viewpoint of Global Workspace theory. First, we ask what kind of evidence has the most direct bearing on the question. The answer given here is ‘contrastive analysis’ -- a set of paired comparisons between similar conscious and unconscious processes. This (...) body of evidence is already quite large, and constrains any possible theory . Because it involves both conscious and unconscious events, it deals directly with our own subjective experience, as anyone can tell by trying the demonstrations in this article. (shrink)

A computable structure $\mathcal {A}$ is $\mathbf {x}$-computably categorical for some Turing degree $\mathbf {x}$ if for every computable structure $\mathcal {B}\cong\mathcal {A}$ there is an isomorphism $f:\mathcal {B}\to\mathcal {A}$ with $f\leq_{T}\mathbf {x}$. A degree $\mathbf {x}$ is a degree of categoricity if there is a computable structure $\mathcal {A}$ such that $\mathcal {A}$ is $\mathbf {x}$-computably categorical, and for all $\mathbf {y}$, if $\mathcal {A}$ is $\mathbf {y}$-computably categorical, then $\mathbf {x}\leq_{T}\mathbf {y}$. We construct a $\Sigma^{0}_{2}$ set whose degree (...) is not a degree of categoricity. We also demonstrate a large class of degrees that are not degrees of categoricity by showing that every degree of a set which is 2-generic relative to some perfect tree is not a degree of categoricity. Finally, we prove that every noncomputable hyperimmune-free degree is not a degree of categoricity. (shrink)