In vertebrates the antero‐posterior organization of the embryonic body axis is thought to result from the activity of two separate centers, the head organizer and the trunk organizer, as operationally defined by Spemann in the 1920s. Current molecular studies have supported the existence of a trunk organizer activity while the presence of a distinct head inducing center has remained elusive. Mainly based on analyses of headless mutants in mice, it has been proposed that the anterior axial mesoderm plays a determining (...) role in head induction. Recent gain‐ and loss‐of‐function studies in various organisms, however, provide compelling evidence that a largely ignored region, the anterior primitive endoderm, specifies rostral identity. In this review we discuss the emerging concept that the anterior primitive endoderm, rather than the prechordal plate mesoderm, induces head development in the vertebrate embryo. (shrink)

"Les uns avec les autres" : ni les “uns”, ni les “autres” ne sont premiers, mais seulement l’“avec” par lequel il y a des “uns” et des “autres”. L’“avec” est une détermination fondamentale de l’“être”. L’existence est essentiellement co-existence. Non seulement co-existence de “nous” (les hommes), mais de tous les étants (il faut de tout faire un “monde”). Être-avec, ou s’exposer les uns aux autres, les uns par les autres : rien à voir avec une “société du spectacle”, mais rien (...) à voir non plus avec une inexposable “authenticité". Nous? mais c'est nous-mêmes que nous attendons sans savoir si nous nous reconnaîtrons. (shrink)

LA QUESTION DE L'IMAGINAIRE SOCIAL ET POLITIQUE.

The obsession is pursued of a word, a sign, a thought that is identical with the thing it signifies, where there is no space between the two. And the nightmare is entertained that, if such an identity is not attained, then intellectual work in general is worth nothing and should be destroyed.

Présentation du Prix d’excellence de l’édition 2019 des Ateliers d’été du Fonds Ricœur.

La solution de Thomas d’Aquin au problème de l’intensification des qualités souffre d’une certaine instabilité et, dans la génération suivante, a été disloquée par les différentes contraintes qu’elle tentait de concilier. Cet article explore les réponses apportées par Gilles de Rome, Godefroid de Fontaines, Pierre d’Auvergne et Thomas de Sutton. Introduite par Godefroid, mais développée par Sutton, la notion de mode va jouer un rôle très important. La solution de Sutton, particulièrement, invite à une comparaison avec la théorie des modes (...) intrinsèques chez Duns Scot. (shrink)

Il ne faut pas confondre ce que nous voyons et ce qui apparaît. Ce que nous voyons se construit à partir de notre point de vue, et donc reste notre objet, que nous tenons sous la garde du regard, que nous tenons littéralement à l’oeil. Ce qui apparaît vient de lui-même, de son fonds d’invu, et s’impose sur la scène sans que nous l’ayons, nous, mis en scène de notre point de vue. Il ne se soumet plus à notre regard, (...) à nos perspectives et dimensions, mais s’en libère et parfois les contredit même. Passer de l’un à l’autre impose sans doute à notre vision l’une des plus radicales transformations, métamorphoses, bref modifi cation de la fi gure qui se puisse concevoir, ou justement qui ne se peut pas concevoir. (shrink)

« L’existence a-t-elle un sens quelconque? – cette question aura besoin de quelques siècles pour seulement être entendue de façon complète et dans toute sa profondeur. » Nietzsche « Parce que la philosophie s’adresse à l’homme dans sa totalité et dans ce qu’il a de plus élevé, il faut que la finitude s’indique dans la philosophie d’une manière tout à fait radicale. » Heidegger.

Pierre Bayle shows that, in order to avoid devastating objections, materialism should postulate that the property of thinking does not emerge from certain material combinations but is present in matter from the start and everywhere—a hypothesis recently revived and labelled “panpsychism”. There are reasons for entertaining the idea that Bayle actually considers this enhanced materialism to be tenable, as it might use the same line of defence that Bayle outlined for Stratonism. However, this would lead to a view similar to (...) Locke’s superaddition theory, and I contend that such cannot be Bayle’s position because he embraces the Cartesian principle that each substance has only one principal attribute. This makes untenable, in his eyes, any system that conjoins thought with matter in the same simple substance. By contrast, this makes clear which kinds of metaphysics and epistemology panpsychists need to adopt to defend their view. (shrink)

Among the many difficulties, or even paradoxes, that phenomenology has imposed upon us by positing itself as a doctrine, or at least as a radical foundation for philosophy, one must first and foremost consider the operation typically referred to as the reduction. The reasons for detecting difficulties therein are many, but they take on even greater significance since Husserl proclaimed the reduction to be fundamental to any philosophy that wished to establish itself as a phenomenology. The history of phenomenology, then, (...) would appear not only as the history of all the difficulties encountered in the reduction, but principally as the history of Husserl’s own self-elucidation of his entire project. This brings us to the point of reformulating Ricoeur’s claim—that phenomenology is the sum of misinterpretations of Husserl’s doctrine—with this new contention: that phenomenology consists in the sum of discussions and disagreements about the doctrine and practice of the reduction. (shrink)

« L’époque semble être au ressentiment et à la réactivité dans le domaine de la pensée. On dit qu’il faut sortir d’une “crise” ou d’un égarement des vingt ou trente dernières années. Comme si la recherche, l’expérimentation, l’inventivité étaient maladives. On dit que la philosophie doit retrouver le sens de l’homme, des valeurs, du sujet. Comme si ces significations ne s’étaient pas épuisées avec l’épuisement général de la métaphysique de la signification. Comme s’il ne s’était rien passé, et qu’on puisse (...) oublier sans risque tout le travail de la philosophie dans notre histoire récente et présente. Il faut être sérieux : on ne “retrouve” jamais rien dans l’histoire, et on ne fait “retour” à rien : ni à Dieu, ni à Kant, ni aux Valeurs. Il y a bien une question du sens : mais elle est devant nous, à venir et à penser. ». (shrink)

In many real-life situations, we are interested in the value of a physical quantity y that is difficult or impossible to measure directly. To estimate y, we find some easier-to-measure quantities x1, … , xn which are related to y by a known relation y = f. Measurements are never 100% accurate; hence, the measured values equation image are different from xi, and the resulting estimate equation image is different from the desired value y = f. How different can it (...) be? Traditional engineering approach to error estimation in data processing assumes that we know the probabilities of different measurement errors equation image. In many practical situations, we only know the upper bound Δi for this error; hence, after the measurement, the only information that we have about xi is that it belongs to the interval equation image. In this case, it is important to find the range y of all possible values of y = f when xi ∈ xi. We start the paper with a brief overview of the computational complexity of the corresponding interval computation problems: Most of the related problems turn out to be, in general, at least NP-hard. In this paper, we show how the use of quantum computing can speed up some computations related to interval and probabilistic uncertainty. We end the paper with speculations on whether “hypothetic” physical devices can compute NP-hard problems faster than in exponential time. Most of the paper's results were first presented at NAFIPS'2003 [30]. (shrink)

Some original forms of state emerge from the clan structures in central Africa in the 16th and 17th centuries, beyond the reach of any European influence. The oral epic traditions which echo these events draw from the founts of Bantu mythic thought. The Luba national epic recounts the dramatic origin of its sacred royalty and describes the passage from a primitive culture to a refined civilization, from an uneventful history to one full of movement; but above all it abandons itself (...) to a singular meditation on the ritual usage of fire, on family and death, on time and space, on the rainbow and lightning. If we take the fantastic seriously, symbolic patterns appear which filter the historical tradition and transform it into metaphysics. The reeling King Woot seems to play in reverse the Luba role, on the royal scene of Kuba mythology, where almost Biblical figures could be recognized: the tower of Babel throws its shadow on the adventures of an African Noah who first abandons himself to drunkenness, then to incest, delivering society to the diversity of languages and plunging the universe into primordial chaos. A transition between the myth and the tale, the founding epic of the Lunda state is bathed three times in blood: the blood of the warriors, of the women, and of the beasts who fall prey to a marvelously seductive hunter. Looking closely, we see that this Prince-stranger, initiator of a line of anointed royalty, carries on his shoulders, as does his Luba counterpart, a part of the universe. The cosmogony is veiled in the myth but transparent in the ritual, in the actions and mysterious words of the initiates into mungonge religious society: men with eyes of light are the counterpart of animals with eyes of darkness, as the star of day is opposed to the sinister hyena-moon. The founding epic of the Bemba state tells, like the Kuba myth, of the fascination of the principle of pleasure among a migrating aristocracy, somewhat decadent in comparison with the rude warrior or hunter heroes in the Luba and Lunda epics. But all these narratives, in the final analysis, form one sole myth, which develops its autonomous structures under the turbulence of an historical adventure each time different. More than unfolding the particular story of each kingdom, these legendary chronicles of Zaïre, Zambia and Angola reveal that the powerful political organisations set up by the Bantu to the south of the great forest are not isolated from eacb other: they administrate in common an intellectual patrimony which breaks loose from the ideological role that the kings, whether drunk on palm wine or on military ambition, try to make them play for their own glory: myths and rites obey their own codes, recognize no master but one, which they give themselves in their own kingdom: the Imaginary. The text which follows here is concerned in particular with the epic of the Bemba people, whose dominating aristocracy imposed an anointed royalty on some 100,000 people formerly grouped in matrilinear clans. (shrink)

The Common that is Least Common. It is not a mere accident if the notion of The Common designates both what is shared by several and something which is banal or trivial. Nothing is more shared than that which is most ordinary. The consequence is that the representations of a « Communism » -even if we leave aside the reference to the various regimes which appropriated the idea of « communism »- are so easily charged with the mistrust which is (...) addressed to the idea of levelling, and with the accusation of seeking to liquidate distinction and superiority. What is collective is accused of stifling originality. « Real » communisms did nothing to try to project a different image. However the communist idea need involve nothing that is « common ». On the contrary. It should open upon the denunciation of the vulgarity of individualism. (shrink)

Painting, according to Jean-Luc Marion, is a central topic of concern for philosophy, particularly phenomenology. For the question of painting is, at its heart, a question of visibility—of appearance. As such, the painting is a privileged case of the phenomenon; the painting becomes an index for investigating the conditions of appearance—or what Marion describes as “phenomenality” in general. In The Crossing of the Visible, Marion takes up just such a project. The natural outgrowth of his earlier reflections on icons, these (...) four studies carefully consider the history of painting—from classical to contemporary—as a fund for phenomenological reflection on the conditions of (in)visibility. Ranging across artists from Raphael to Rothko, Caravaggio to Pollock, The Crossing of the Visible offers both a critique of contemporary accounts of the visual and a constructive alternative. According to Marion, the proper response to the “nihilism” of postmodernity is not iconoclasm, but rather a radically iconic account of the visual and the arts that opens them to the invisible. (shrink)

Ce texte de Jean-Luc Nancy est une « divagation » pensante sur ce qu’évoquent les iris, ces fleurs dont le nom fait penser à celui d’un auteur qui a sans cesse joué avec ce type de consonances et de résonnances, entre les mots, les choses et les idées. Iris est une déesse qui importe à la philosophie : elle est la messagère des dieux, et comme un arc-en-ciel qui ne cesse de susciter l’étonnement. Nous sommes invités à emprunter quelques-unes de (...) ces infinies bifurcations. (shrink)

This book, formed as a series of essays in honour of Professor Carl Baudenbacher, addresses the very art of judicial reasoning, and features contributions from many of the foremost current or former national, supranational, or international judges. This unique volume is intended first and foremost for legal scholars, but its approachable style makes it readily accessible for students and for those with a general interest in the application of the law and justice in today's multi-layered world. The collection of essays (...) is rather more philosophical and reflective as opposed to doctrinal. Each contribution focuses on the nature and operation of justice, the independence of the judiciary, and on judicial style primarily from the perspective of the judges themselves. The book provides perspectives on what it means to be accountable and independent as a judge, the role of language and languages in the quest for justice, while other contributions acquaint readers with the some of the structures of courts themselves, or indeed question for whom judgments are written. Each chapter has been written by a presiding judge, or head of an institution and the book is divided into three parts: - Part I Art and Method - Part II Justice and the Judiciary - Part III Reasoning and Language(s). (shrink)

Now in paperback, Jean-Luc Marion's groundbreaking philosophy of human uncertainty. In Negative Certainties, renowned philosopher Jean-Luc Marion challenges some of the most fundamental assumptions we have developed about knowledge: that it is categorical, predicative, and positive. Following Descartes, Kant, and Heidegger, he looks toward our finitude and the limits of our reason. He asks an astonishingly simple—but profoundly provocative—question in order to open up an entirely new way of thinking about knowledge: Isn’t our uncertainty, our finitude, and rational limitations, one (...) of the few things we can be certain about? Marion shows how the assumption of knowledge as positive demands a reductive epistemology that disregards immeasurable or disorderly phenomena. He shows that we have experiences every day that have no identifiable causes or predictable reasons and that these constitute a very real knowledge—a knowledge of the limits of what can be known. Establishing this “negative certainty,” Marion applies it to four aporias, or issues of certain uncertainty: the definition of man; the nature of God; the unconditionality of the gift; and the unpredictability of events. Translated for the first time into English, Negative Certainties is an invigorating work of epistemological inquiry that will take a central place in Marion’s oeuvre. (shrink)

Les lettres présentent, par rapport au reste de l'œuvre de Platon, un double intérêt : là seulement le philosophe parle à la première personne, là seulement il se décrit en action. Les Lettres nous présentent un autre Platon que celui des dialogues, celui qui, tout jeune homme, veut jouer un rôle politique à Athènes et qui, plus tard, cherche à réaliser à Syracuse les projets politiques qu'on trouve exposés d'abord dans la République, puis dans le Politique et dans les Lois. (...) Par là, Platon ouvre une tradition qui se maintiendra après lui, comme en font foi, entre autres, les exemples de Descartes auprès de Christine de Suède, de Voltaire auprès de Frédéric II de Prusse ou de Diderot auprès de Catherine II de Russie : celui du philosophe conseiller du chef d'Etat. (shrink)