Collinearity or correspondence between the contours of the inducing figure to allow `contour continuation' or `figure completion' were, according to G. Kanizsa, the necessary conditions for producing anomalous surfaces or contours. Since Kanizsa's early work various hypotheses have been advanced to explain the phenomenon, but very few examples of anomalous contours that do not satisfy the above conditions have been reported. When two small white discs (1 cm in diameter) are set on a larger black disc in slow rotation, the (...) two discs, after some observation time, will appear as the extremities of a rigid cylinder displaced in depth. The surface of the cylinder, under dim illumination, appears as a whitish transparent surface. However, when the two discs are substituted by a circle and a semicircle of the same size, a clear anomalous contour appears to form the cylinder, even under clear light conditions and when the colours are reversed; i.e., black circles on white disc. The anomalous contours are not apparent when the configuration is stationary. I will demonstrate how the anomalous contours of a stereokinetic cylinder can be obtained even without the “interruption” of the lines in the semicircle. (shrink)

Let M be an o-minimal expansion of a real closed field. Let G be a definably compact definably connected abelian n-dimensional group definable in M. We show the following: the o-minimal fundamental group of G is isomorphic to ℤn; for each k>0, the k-torsion subgroup of G is isomorphic to n, and the o-minimal cohomology algebra over ℚ of G is isomorphic to the exterior algebra over ℚ with n generators of degree one.

Este artículo utiliza las intuiciones de Carole Pateman, en su libro El contrato sexual, para criticar la manera en que las instituciones cuya racionalidad y legitimidad emergen del contractualismo moderno no consideran en igualdad de condiciones a las personas con discapacidad. Esto, a consecuencia de que el contrato social presupone ideas unívocas de racionalidad y cooperación que se definen a partir de los parámetros de las personas sin discapacidad. Así, el paradigma del capacitismo, que identifica a la ciudadanía con la (...) posesión de capacidades regulares, genera un contrato funcional que invisibiliza y naturaliza la discriminación fundada en la discapacidad. (shrink)

Mit der Digitalisierung geht ein fundamentaler, herausfordernder Wandel einher. Durch eine Begriffsbestimmung und Operationalisierung wird in diesem Beitrag der digitale Wandel aus wirtschaftsphilosophischer Sicht vorgestellt. Zunächst werden wirtschaftsphilosophische Grundlagen der Digitalisierung wie die Informationsethik erläutert, gefolgt von einer Diskussion der digitalen Wertschöpfung, die auf Überwachung aufbaut und von einer Überwachungskultur gespeist wird. Schließlich werden Zukunftsperspektiven zum Internet der Dinge, Pricing, Privatheit und der Digitalen Demokratie skizziert.

L’idea di una comunità politica fondata sulla giustizia rappresenta in Pla¬tone una doppia terapia: quella della malattia della città, che è conflittuale perché divisa in centri privati di interessi e di affetti, e dell’anima, scissa in centri motivazionali opposti che rendono difficile il comando della razionalità. La comunità politica non è un dato naturale o storico, ma un progetto, un costrutto artificiale, cioè il compito di una élite intellettuale . Ma questa comunità si realizza intanto nella pratica discorsiva e nella (...) decisione morale di quanti ne fanno il proprio orizzonte etico-politico.The idea of a political community founded on justice represents in Plato a therapy both for the illness of the city , and of the soul . The just political community is not for Plato a natural or historical fact, rather a project, an artificial construct, that is the task of an intellectual élite . But meanwhile such community exists in the dialogical practice and in the moral decision of those accepting it as their own ethical and political horizon. (shrink)

This essay focuses on the impossibility of considering food as ‘a thing.’ It addresses the legal profiles of food from an interdisciplinary perspective by treating the production, signification and consumption of food as semio-spatial categories. The argument starts from the foundational premise that the dynamics of food, as a magmatic flow, comprehensively connect and transform all human activities and ecological aspects of life. Like a stream of radial projections in a mass of fluid, food functions as a semiotic membrane, embodying (...) the fundamental relationality of each human body to the whole globe. The main implication subsequently drawn from this view of ‘food’ is that to eat is always and everywhere to incorporate the entire world. Since food is the epitome of the space and time proactively and enactively involved in its production, in terms of both human activities and natural resources, by the mere fact of eating no human being can avoid recognizing themselves as a space–time cannibal. The consequences of this conclusion for food justice and its spatial dynamics are enormous, and even more so in light of the current ecological crisis. The essay thus critiques many categories related to the food politics of the ecological footprint, including sustainability, bio-diversity, food systems, and the circularity of food and resources. One proposed alternative offered is a chorological reading of human rights and their possible use as semantic-spatial transducers of the activities and phenomena inherent in the ‘food-as-omnilateral-relationship.’ The dynamic and transformative relationship between space, human rights and ecological change emerges clearly. Human action, and thus law are, then, constitutive ‘ingredients’ of food, which comes to the fore as a ubiquitous icon of the interpenetrative relationship between humanity and the becoming of the Earth; being and becoming blur. In the same vein, spaces and actions, facts and values are transformed into moving elements of an overall evolving situation that makes each a means of the other and thereby a generative factor of its significance. (shrink)

Resumen: Este texto consiste básicamente en una presentación general de la corriente filosófica del nuevo realismo surgida en 2007 y en la que participan autores europeos y norteamericanos. Un punto en común de las diversas posiciones dentro de esta corriente es el deslinde crítico frente a la filosofía posmoderna y a la filosofía moderna en general. Explico esta crítica y sus implicaciones para la posibilidad de un restablecimiento en la filosofía contemporánea del pensamiento metafísico.: This text is basically an overview (...) of philosophical new realism which emerged in 2007 and involves European and American authors. A common point to the various positions within this current is a critical detachment from postmodern philosophy and modern philosophy in general. i explain this criticism and its implications for the possibility of a restoration in contemporary philosophy of metaphysical thought. (shrink)

This collection of essays, written on four continents by scientists, philosophers and humanists, was initially presented to Karl R. Popper on his sixtieth birthday as a token of critical admiration and in recognition of his work. But the volume also stands on its own as a remarkable series of statements utilizing Popper's critical vision in the study of philosophy proper, logic, mathematics, science as method and theory, and finally to the study of society and history. What is remarkable is that (...) Popper worked in all of these areas, not in a cursory or discursive way, but with the utmost clarity and rigor.. The core position of this volume and its contributors is that the progress of knowledge is not a linear accumulation of definitive acquisitions but a zigzagging process in which counterexamples and unfavorable evidence ruin generalizations and prompt the invention of more comprehensive and sometimes deeper generalizations, to be criticized in their turn. A critical approach to problems, procedures, and results in every field of inquiry is therefore a necessary condition for the continuance of progress. The title of this volume then is, in a sense, an homage to Popper's critical rationalism and critical empiricism. The essays are a tribute to his unceasing and uncompromising quest, not for final certainty, but for closer truth and increased clarity. Among the contributors are outstanding figures in philosophy and the exact sciences in their own right, including Herbert Feigl, R. M. Hare, J.O. Wisdom, Nicholas Rescher, David Bohm, Paul K. Feyerabend, F. A. Hayek, and Adolf Grunbaum. Social science contributions include Hans Albert on social science and moral philosophy, W. B. Gallie, on the critical philosophy of history, Pieter Geyl on The Open Society and its Enemies, and George H. Nadel on the philosophy of History. (shrink)