In this work, we propose a meaningful extension of description logics for non-monotonic reasoning. We introduce \, a logic allowing for the representation of and reasoning about both typical class-membership and typical instances of a relation. We propose a preferential semantics for \ in terms of partially-ordered DL interpretations which intuitively captures the notions of typicality we are interested in. We define a tableau-based algorithm for checking \ knowledge-base consistency that always terminates and we show that it is sound and (...) complete w.r.t. our preferential semantics. The general framework we here propose can serve as the foundation for further exploration of non-monotonic reasoning in description logics and similarly structured logics. (shrink)

The philosopher Jorge J. E. Gracia engages fifteen prominent scholars on race, ethnicity, nationality, and Hispanic/Latino identity in the United States. Their discussion joins two distinct traditions: the philosophy of race begun by African Americans in the nineteenth century, and the search for an understanding of identity initiated by Latin American philosophers in the sixteenth century. Participants include Linda M. Alcoff, K. Anthony Appiah, Richard J. Bernstein, Lawrence Blum, Robert Gooding-Williams, Eduardo Mendieta, and Lucius T. Outlaw Jr., and their dialogue (...) reflects the analytic, Aristotelian, Continental, literary, Marxist, and pragmatic schools of thought. These intellectuals start with the philosophy of Hispanics/Latinos in the United States and then move to the philosophy of African Americans and Anglo Americans in the United States and the philosophy of Latin Americans in Latin America. Gracia and his interlocutors debate the nature of race and ethnicity and their relation to nationality, linguistic rights, matters of identity, and Affirmative Action, binding the concepts of race and ethnicity together in ways that open new paths of inquiry. Gracia's Familial-Historical View of ethnic and Hispanic/Latino identity operates at the center of each of these discussions, providing vivid access to the philosopher's provocative arguments while adding unique depth to issues that each of us struggles to understand. (shrink)

Frege's account of indirect proof has been thought to be problematic. This thought seems to rest on the supposition that some notion of logical consequence ? which Frege did not have ? is indispensable for a satisfactory account of indirect proof. It is not so. Frege's account is no less workable than the account predominant today. Indeed, Frege's account may be best understood as a restatement of the latter, although from a higher order point of view. I argue that this (...) ascent is motivated by Frege's conception of logic. (shrink)

I propose that the fundamental challenge Berkeley left realists is to account for experiences’ ability to present items as mind-independent, consistent with the claim that experiences always present themselves among the items of awareness. By exploring two ways of responding to this challenge, and ruling out the second, I hope to show that realists aiming to secure a role for experiences in grounding our grasp of mind-independence need to adopt a specific view of perceptual experience. They must take experiences to (...) have translucent aspects, and accord such aspects an essential role in presenting us with a mind-independent world. (shrink)

Previous research using immersive virtual reality (VR) has shown that after a short period of embodiment of White people in a Black virtual body their implicit racial bias against Black people diminishes. Here we tested the effects of some socio-cognitive variables that could contribute to enhancing or reducing the implicit racial bias. The first aim of the study was to assess the beneficial effects of cooperation within a VR scenario, the second aim was to provide preliminary testing of the hypothesis (...) that empathy and political attitudes could contribute to implicit bias about race, while the third aim was to explore the relationship between political attitudes and empathy. We had (Caucasian) participants embodied in a Black virtual body and engaged either in a cooperative (Coop group) or in a non-cooperative (Neutral group) activity with a confederate experimenter embodying another Black avatar. Before and after VR, we measured participants’ implicit racial bias by means of Implicit Association Test (IAT) and their perceived closeness toward the confederate experimenter. Before VR we also assessed participants’ political attitudes and empathy traits. Results revealed that, as compared to the Neutral group, the Coop group showed lower IAT scores after the social interaction. Interestingly, in the Neutral but not the Coop group the perceived closeness toward the confederate experimenter was associated with the initial racial bias: the more the participants reduced their distance, the more they reduced their IAT score. Moreover, reported traits of empathy and political attitudes significantly explained the variance observed in the initial implicit bias, with perspective-taking, empathic concern, and personal distress being significant predictors of the IAT scores. Finally, there was a relationship between political attitudes and empathy: the more participants considered themselves as left-wing voters, the higher their perspective-taking and empathic concern scores. We discuss these findings within the neuroscientific and social cognition field and encourage scholars from different domains to further explore whether and under which conditions a given manipulation for reducing racial bias could be efficiently transposed in VR. (shrink)

How could perceptual experiences reveal matters of essentiality? Answering this question is crucial for vindicating a thesis about the epistemic import of experience, commonly known as Revelation. The thesis comes in a weak and a strong version. Only on the strong one could it make up an authoritative piece of common sense. But this version also seems to demand too much of our experiences, namely that they can reveal essentiality. However, the impression that our experiences are not suited for this (...) turns out to be due to a non-mandatory assumption about how the revelation of essentiality would work. (shrink)

Contrairement à la philosophie théorique, où la raison vise à la contemplation désintéressée, la philosophie pratique vise à l'action bonne ; et celle-ci est éthique ou politique, selon qu'elle a pour objet le bien de l'individu ou le bien de la cité. Les deux traités classiques qui, dans ce double domaine pratique, livrent la pensée définitive d'Aristote, sont l'Ethique nicomachéenne et la Politique. Ils font ici l'objet d'une étude historique et analytique. Mais il paraît indispensable aussi de soumettre à un (...) examen les trois autres traités d'Aristote qui ont préparé l'Ethique nicomachéenne : la Grande éthique, l'Ethique eudémienne et la Rhétorique. En particulier, le premier d'entre eux, qui a été systématiquement rejeté ou négligé par les spécialistes, a de bonnes chances d'être d'Aristote lui-même et ne peut être sous-estimé dans un travail consacré à la genèse et à l'épanouissement de sa philosophie pratique. (shrink)

Allosteric and transmembrane signaling are among the major questions of structural biology. Here, we review and discuss signal transduction in four-helical TM bundles, focusing on histidine kinases and chemoreceptors found in two-component systems. Previously, piston, scissors, and helical rotation have been proposed as the mechanisms of TM signaling. We discuss theoretically possible conformational changes and examine the available experimental data, including the recent crystallographic structures of nitrate/nitrite sensor histidine kinase NarQ and phototaxis system NpSRII:NpHtrII. We show that TM helices can (...) flex at multiple points and argue that the various conformational changes are not mutually exclusive, and often are observed concomitantly, throughout the TM domain or in its part. The piston and scissoring motions are the most prominent motions in the structures, but more research is needed for definitive conclusions. Models of allosteric transmembrane signaling in microbial sensor histidine kinases and chemoreceptors are discussed in light of recent crystallographic structures. It is shown that the TM α-helices are flexible and various conformational changes are often observed concomitantly. The piston and scissoring motions are the most prominent in the structures. (shrink)

El texto explora el papel que juegan los argumentos de naturaleza filosófica y religiosa en la razón pública, trayendo a colación el debate acerca del aborto, tema en el que John Rawls pone a prueba su propuesta. La tesis es que en el liberalismo rawlsiano, los argumentos filosóficos y religiosos juegan un papel semi-público, es decir, están referidos básicamente a la razón social, la cual se encuadra en la sociedad civil.

A renewed search for legal certainty is a reaction to the preponderance of judge made law, which has been in turn prompted by the democratic deficit of the EU and the impact of Anglo-American law. The problem is that the search is oblivious to both systematic interpretation and the need of re-systematization of law. The paper defines systematic interpretation, relates the definition to standard French and German conceptions, indicates the room for systematic interpretation in Anglo-American laws, and states prima facie (...) reasons for a re-systematization of law as a prerequisite of systematic interpretation. The problem cannot be appreciated outside its proper context. It is a disregard for causation and evaluation. Hence the paper outlines Aristotle’s understanding of causation and evaluation in his presentation of phronesis, reconsiders continental European legal thought in the light of Aristotle’s presentation, and offers policy-oriented jurisprudence as a remedy to the deficit of evaluation and causation in European legal thought. A solution to the problem offers a typology of criteria and clarifies positive and fundamental legal concepts, positive and fundamental criteria of systematization, and the place of criteria in knowledge of law. The usefulness of the criteria is demonstrated by a common approach to the systematization of law and an alternative diagnosis of a defect of systematization diagnosed by an authority in history and philosophy of law rather than legal theory. (shrink)