About three decades ago, AI theory underwent a sharp turn as a consequence of criticism that pointed out the problem of externalism in the cognitivist position. Hubert Dreyfus, undoubtedly the main exponent of this criticism, opened the possibility of a Heideggerian reading using the frame problem to bring to light obscurities that otherwise would have been very difficult to detect. However, the question still remains of whether or not Heidegger’s philosophy can serve as the source of a positive contribution to (...) AI. In this paper, we argue that in the small measure in which such a task has been attempted, its orientation has been hampered by the omission of what, for Heidegger, was the central issue to be pondered: the question for being and the ontological difference. To propose a possible direction in which AI can be headed as a consequence of this novel perspective, we undertake a brief and schematic review of two published projects suggesting that they both manage to avoid the frame problem and also bear this Heideggerian outlook. (shrink)

Game theory has proven useful in clarifying Hobbes’s argument that the state of nature will inevitably devolve into a state of war. Mathematically-leaning philosophers, however, have paid little attention to Rousseau’s depiction of the state of nature as a peaceful, asocial state of solitary wanderers. This paper articulates Rousseau’s critique of Hobbes in formal terms, which pinpoints two crucial issues in Hobbes’s account: the lack of an exit option and an unrealistic depiction of human nature. Building upon recent game-theoretic treatments (...) of Hobbes, we first construct a model that incorporates Rousseau’s criticisms by permitting an exit option and endogenizing human preferences and capacities. Second, we draw out the implications of Rousseau’s analysis for the question of political authority, which cannot be answered, as Hobbes believed, by invoking a hypothetical state of nature. (shrink)

Several political philosophers have recently pointed out that current electoral democracies fail to facilitate accurate and reliable feedback on the performance of public officials. Rather than rejecting democracy as a hopeless ideal, we defend an institutional reform called Service Responsibility, which introduces a superior incentive structure that better aligns the interests of citizens and public officials. Service Responsibility requires increasing or decreasing the income of public officials insofar as they succeed or fail to achieve democratically chosen goals. Later, we consider (...) an alternative institutional scheme, recently proposed by Claudio López-Guerra: Piloting Responsibility. According to this alternative proposal, public officials must utilize a public provider whenever they seek out a basic service. We show that Piloting Responsibility fails to realize the democratic ideal because it generates a perverse incentive structure for public officials. We conclude that Service Responsibility outperforms both the status quo and Piloting Responsibility as an institutional scheme for ensuring competent governance and public justification. (shrink)

The article describes several representations of Alexander the Great which were current in medieval Arabic learned circles and proposes some ideas on the genesis of these representations in the Greek and Syriac civilizations: 1) Alexander as moralist; 2) Alexander as a mystical philosopher who knew the mysterious links governing the cosmos; 3) Alexander as a monotheist philosopher who was charged with responsibility for the d; 4) Alexander as a cunning politician.

Since the publication of Alexander Weheliye’s Habeas Viscous (2014), a devastating critique of biopolitics from the perspective of Black feminist theory, I have been on the lookout for a critique o...

There is an underlying assumption in the social sciences that consciousness and social life are ultimately classical physical/material phenomena. In this ground-breaking book, Alexander Wendt challenges this assumption by proposing that consciousness is, in fact, a macroscopic quantum mechanical phenomenon. In the first half of the book, Wendt justifies the insertion of quantum theory into social scientific debates, introduces social scientists to quantum theory and the philosophical controversy about its interpretation, and then defends the quantum consciousness hypothesis against the (...) orthodox, classical approach to the mind-body problem. In the second half, he develops the implications of this metaphysical perspective for the nature of language and the agent-structure problem in social ontology. Wendt's argument is a revolutionary development which raises fundamental questions about the nature of social life and the work of those who study it. (shrink)

This Is A New Release Of The Original 1868 Edition.

Predictivists use the no miracle argument to argue that “novel” predictions are decisive evidence for theories, while mere accommodation of “old” data cannot confirm to a significant degree. But deductivists claim that since confirmation is a logical theory-data relationship, predicted data cannot confirm more than merely deduced data, and cite historical cases in which known data confirmed theories quite strongly. On the other hand, the advantage of prediction over accommodation is needed by scientific realists to resist Laudan’s criticisms of the (...) no miracle argument. So, if the deductivists are right, the most powerful argument for realism collapses. There seems to be an inescapable contradiction between these prima facie plausible arguments of predictivists and deductivists; but this puzzle can be solved by understanding what exactly counts as novelty, if novel predictions must support the no miracle argument, i.e., if they must be explainable only by the truth of theories. Taking my cues from the use-novelty tradition, I argue that (1) the predicted data must not be used essentially in building the theory or choosing the auxiliary assumptions. This is possible if the theory and its auxiliary assumptions are plausible independently of the predicted data, and I analyze the consequences of this requirement in terms of best explanation of diverse bodies of data. Moreover, the predicted data must be (2) a priori improbable, and (3) heterogeneous to the essentially used data. My proposed notion of novelty, therefore, is not historical, but functional. Hence, deductivists are right that confirmation is independent of time and of historical contingencies such as if the theorist knew a datum, used it, or intended to accommodate it. Predictivists, however, are right that not all consequences confirm equally, and confirmation is not purely a logical theory-data relation, as it crucially involves background epistemic conditions and the notion of best explanation. Conditions (1)–(3) make the difference between prediction and accommodation, and account for the confirming power of theoretical virtues such as non ad-hocness, non-fudging, non-overfitting, independence and consilience. I thus show that functional novelty (a) avoids the deductivist objections to predictivism, (b) is a gradual notion, in accordance with the common intuition that confirmation comes in degrees, and (c) supports the no miracle argument, so vindicating scientific realism. (shrink)

There are two possible realist defense strategies against the pessimistic meta-induction and Laudan’s meta-modus tollens: the selective strategy, claiming that discarded theories are partially true, and the discontinuity strategy, denying that pessimism about past theories can be extended to current ones. A radical version of discontinuity realism is proposed by Gerald Doppelt: rather than discriminating between true and false components within theories, he holds that superseded theories cannot be shown to be even partially true, while present best theories are demonstrably (...) completely true. I argue that this position, running counter both the cumulativity of science and fallibilism, is untenable; it cannot account for the success of past theories, nor for the failures of current theories, and rather than shutting the door to the pessimistic historical objections it opens it wide. The best strategy, instead, joins the selective idea there was both some truth and some falsity in discarded theories, like in current ones, with the moderate discontinuity idea that the truth rate in present best theories is much greater than in past ones. (shrink)

What is honor? Has its meaning changed since ancient times? Is it an outmoded notion? Does it still have the power to direct our behavior? In this provocative book Alexander Welsh considers the history and meaning of honor and dismisses the idea that we live in a post-honor culture. He notes that we have words other than _honor_, such as _respect_, _self-respect_, and personal _identity_, that show we do indeed care deeply about honor. Honor, he argues, is a continuing (...) process of respect that motivates or constrains members of a peer group. Honor’s dictates function as moral imperatives. Surprisingly, little systematic study of the history of honor in Western culture has been attempted. Offering a welcome remedy, Welsh provides a genealogy of approaches to the subject, mining some of the most influential texts of the Western tradition. He rereads with fascinating results the works of Aristotle, Cicero, Shakespeare, Mandeville, Montesquieu, Rousseau, Kant, Adam Smith, and others. With a sharp focus on the intersection of honor and ethics in both literature and philosophy, Welsh invites new and constructive debate on a topic of vital interest. (shrink)

Much has been written on whether practical knowledge (knowledge-how) reduces to propositional knowledge (knowledge-that). Less attention has been paid to what we call deliberative knowledge (knowledge-to), i.e., knowledge ascriptions embedding other infinitival questions, like _where to meet_, _when to leave_, and _what to bring_. We offer an analysis of knowledge-to and argue on its basis that, regardless of whether knowledge-how reduces to knowledge-that, no such reduction of knowledge-to is forthcoming. Knowledge-to, unlike knowledge-that and knowledge-how, requires the agent to have formed (...) certain conditional intentions. We discuss the philosophical implications for knowledge-how, deliberative questions, and virtue. (shrink)

In light of the problem of logical omniscience, some scholars have argued that belief is question-sensitive: agents don't simply believe propositions but rather believe answers to questions. Hoek (2022) has recently developed a version of this approach on which a belief state is a "web" of questions and answers. Here, we present several challenges to Hoek's question-sensitive account of belief. First, Hoek's account is prone to very similar logical omniscience problems as those he claims to address. Second, the link between (...) belief and action he proposes is too rigid. We close by sketching a generalization of the account that can meet these challenges. (shrink)

Achieving space domain awareness requires the identification, characterization, and tracking of space objects. Storing and leveraging associated space object data for purposes such as hostile threat assessment, object identification, and collision prediction and avoidance present further challenges. Space objects are characterized according to a variety of parameters including their identifiers, design specifications, components, subsystems, capabilities, vulnerabilities, origins, missions, orbital elements, patterns of life, processes, operational statuses, and associated persons, organizations, or nations. The Space Object Ontology provides a consensus-based realist framework (...) for formulating such characterizations in a computable fashion. Space object data are aligned with classes and relations in the Space Object Ontology and stored in a dynamically updated Resource Description Framework triple store, which can be queried to support space domain awareness and the needs of spacecraft operators. This paper presents the core of the Space Object Ontology, discusses its advantages over other approaches to space object classification, and demonstrates its ability to combine diverse sets of data from multiple sources within an expandable framework. Finally, we show how the ontology provides benefits for enhancing and maintaining longterm space domain awareness. (shrink)

Achieving space situational awareness requires, at a minimum, the identification, characterization, and tracking of space objects. Leveraging the resultant space object data for purposes such as hostile threat assessment, object identification, and conjunction assessment presents major challenges. This is in part because in characterizing space objects we reference a variety of identifiers, components, subsystems, capabilities, vulnerabilities, origins, missions, orbital elements, patterns of life, operational processes, operational statuses, and so forth, which tend to be defined in highly heterogeneous and sometimes inconsistent (...) ways. The Space Domain Ontologies are designed to provide a consensus-based realist framework for formulating such characterizations in a way that is both consistent and computable. Space object data are aligned with classes and relations in a suite of ontologies built around the existing Space Object Ontology. They are stored in a dynamically updated Resource Description Framework triple store, which can be queried to support space situational awareness and the needs of spacecraft operators and analysts. This paper provides an overview of the Space Domain Ontologies and their development and use. It presents the motivation for and advantages of the Space Domain Ontologies, including the benefits they provide for enhancing and maintaining long-term space situational awareness. (shrink)

The medial prefrontal cortex (mPFC) has been the subject of intense interest as a locus of cognitive control. Several computational models have been proposed to account for a range of effects, including error detection, conflict monitoring, error likelihood prediction, and numerous other effects observed with single-unit neurophysiology, fMRI, and lesion studies. Here, we review the state of computational models of cognitive control and offer a new theoretical synthesis of the mPFC as signaling response–outcome predictions. This new synthesis has two interacting (...) components. The first component learns to predict the various possible outcomes of a planned action, and the second component detects discrepancies between the actual and intended responses; the detected discrepancies in turn update the outcome predictions. This single construct is consistent with a wide array of performance monitoring effects in mPFC and suggests a unifying account of the cognitive role of medial PFC in performance monitoring. (shrink)

Here we prove the existence of sheaf cohomology theory in arbitrary o-minimal structures.

Criticisms à la Laudan can block the “no miracles” argument for the (approximate) truth of whole theories. Realists have thus retrenched, arguing that at least the individual claims deployed in the derivation of novel predictions should be considered (approximately) true. But for Lyons (2002) there are historical counterexamples even to this weaker “deployment” realism: he lists a number of novel predictions supposedly derived from (radically) false claims. But if so, those successes would seem unexplainable, even by Lyons’ “modest surrealism” or (...) other surrogates to realism. In fact, I argue, some of those predictions were an easy guess, or independently probable in the light of available evidence; hence, they are no counterexamples to deployment realism, for the no miracles argument wouldn’t apply to them. In other instances, pace Lyon, the prediction was actually false, and could be reinterpreted as true only by interpreting as true also the claim from which it was derived; or again, a false claim was employed in the derivation of a true prediction, but inessentially, the essential role being played by a weaker true claim. But as soon as the paradoxical air of such historical cases is explained away in any of these manners, they cease to represent counterexamples to deployment realism. If, as I suggest, all of them can be dealt with by these strategies, a theoretical claim can still be assumed to be true if it is crucial in deriving an improbable novel prediction. (shrink)

Entrevista concedida por Antonio Negri a Homero Santiago e Mario Marino por ocasião do lançamento da segunda edição da tradução brasileira de A anomalia selvagem: poder e potência em Espinosa.

To understand the future of informed consent, we should pay attention to two ethical-legal sources in addition to the revised Common Rule. Physicians acting as investigators and patients serving as research subjects bring to that relationship a long history regarding consent to treatment, and everyone dealing with research ethics needs to be aware of the Nuremberg Code and other human-rights documents. These three streams make separate and distinctly different contributions to informed consent doctrine.

Gerald Doppelt claims that Deployment Realism cannot withstand the antirealist objections based on the “pessimistic meta-induction” and Laudan’s historical counterexamples. Moreover it is incomplete, as it purports to explain the predictive success of theories, but overlooks the necessity to explain also their explanatory success. Accordingly, he proposes a new version of realism, presented as the best explanation of both predictive and explanatory success, and committed only to the truth of best current theories, not of the discarded ones. Elsewhere I criticized (...) his new brand of realism. Here instead I argue that Doppelt has not shown that Deployment Realism cannot solve the problems raised by the history of science, explaining explanatory success does not add much to explaining novel predictive success, and Doppelt is right that truth is not a sufficient explanans, but for different reasons, and this does not refute Deployment Realism, but helps to detail it better. In a more explicit formulation, the realist IBE concludes not only to the truth of theories, but also to the reliability of scientists and scientific method, the order and simplicity of nature, and the approximate truth of background theories. (shrink)

El propósito de este artículo consiste en mostrar el carácter social del contractualismo de Fichte. Para realizar ese propósito se comienza examinando la conexión entre trabajo y ciudadanía como una condición de la legitimidad política. Luego se presenta esa conexión en el marco del siempre posible desarrollo histórico de la naturaleza humana. Por último, se indican las razones de la recepción de Fichte como un precursor del socialismo germánico.

Alexander's views on universals are, it seems, quite important in the history of western philosophy. When Boethius gives in his second commentary on Porphyry's Isagoge his solution to the problem of universals as he conceived it, he claims to be adopting Alexander's approach. If true, this means that the locus classicus for all western medieval thinkers on this topic is really a rendering of Alexander's teaching. Alexander commented Aristotle’s statement in his On the Soul “The universal (...) animal either is nothing at all or is posterior if it exists”, and this commentary has been translated into Arabic several times in the classical period. In this study the anonymous Arabic translations of Alexander’s commentary has been translated into English. (shrink)

Many formulations of scientific realism (SR) include some commitment to metaphysical realism (MR). On the other hand, authors like Schlick, Carnap and Putnam held forms of scientific realism coupled with metaphysical antirealism (and this has analogies in Kant). So we might ask: do scientific realists really need MR? or is MR already implied by SR, so that SR is actually incompatible with metaphysical antirealism? And if MR must really be added to SR, why is that so? And which additional arguments (...) scientific realists need to support it? After reviewing and classifying a number of different kinds of realisms, metaphysical and not, I answer that SR and MR are logically independent of each other, so that there is no logical inconsistency in holding SR while rejecting MR. However, I argue that the “no miracle” argument (NMA) not only is the “ultimate” argument for SR, but by the same token it also supports MR. Therefore one cannot effectively defend SR without also subscribing to MR, but this can be done at no additional argumentative cost. I show this by discussing not only the standard version of the NMA, but also three more versions which are not usually considered as such in the literature. (shrink)

We present a novel semantic and conversational framework for a class of gradable-like constructions. These include metalinguistic comparatives, like "Ann is more a linguist than a philosopher", as well as metalinguistic equatives, degree modifications, and conditionals. To the extent previous literature discusses such metalinguistic gradability, the focus has been on comparatives. We extend our account of metalinguistic comparatives (Rudolph & Kocurek 2020) to cover a broader range of metalinguistic gradable constructions. On our semantic expressivist view, these all serve in various (...) ways to express speakers' relative commitments to different linguistic interpretations. (shrink)

Nietzsche, the Godfather of Fascism? What can Nietzsche have in common with this murderous ideology? Frequently described as the "radical aristocrat" of the spirit, Nietzsche abhorred mass culture and strove to cultivate an Übermensch endowed with exceptional mental qualities. What can such a thinker have in common with the fascistic manipulation of the masses for chauvinistic goals that crushed the autonomy of the individual? The question that lies at the heart of this collection is how Nietzsche came to acquire the (...) deadly "honor" of being considered the philosopher of the Third Reich and whether such claims had any justification. Does it make any sense to hold him in some way responsible for the horrors of Auschwitz? The editors present a range of views that attempt to do justice to the ambiguity and richness of Nietzsche's thought. First-rate contributions by a variety of distinguished philosophers and historians explore in depth Nietzsche's attitudes toward Jews, Judaism, Christianity, anti-Semitism, and National Socialism. They interrogate Nietzsche's writings for fascist and anti-Semitic proclivities and consider how they were read by fascists who claimed Nietzsche as their intellectual godfather. There is much that is disturbingly antiegalitarian and antidemocratic in Nietzsche, and his writings on Jews are open to differing interpretations. Yet his emphasis on individualism and contempt for German nationalism and anti-Semitism put him at stark odds with Nazi ideology. The Nietzsche that emerges here is a tragic prophet of the spiritual vacuum that produced the twentieth century's totalitarian movements, the thinker who best diagnosed the pathologies of fin-de-siècle European culture. Nietzsche dared to look into the abyss of modern nihilism. This book tells us what he found. The contributors are Menahem Brinker, Daniel W. Conway, Stanley Corngold, Kurt Rudolf Fischer, Jacob Golomb, Robert C. Holub, Berel Lang, Wolfgang Müller-Lauter, Alexander Nehamas, David Ohana, Roderick Stackelberg, Mario Sznajder, Geoffrey Waite, Robert S. Wistrich, and Yirmiyahu Yovel. (shrink)

In this paper, we analyze the legal situation regarding physician-assisted suicide in the world. Our hypothesis is that the prohibitive stance on physician-assisted suicide in most societies in the world today seems to be related to our moral attitudes toward suicide. This brings us to a discussion about life itself. We claim that the total lack of legal protection for physician-assisted suicide from international organizations and most countries in the world lies in a philosophical assumption that supports much of our (...) common beliefs about what life really is. This assumption states that life must be thought of as not belonging exclusively to the individual. We argue that this assumption is a misconception that can be heard in the debate on suicide. Consequently we endorse a different conception of life which tends to favor a pro-choice stance towards suicide and assisted death in general. This position takes the patient’s decision about when to die more seriously. We conclude that there is no reason why physician-assisted suicide does not deserve legal protection as an individual right to die under international law. (shrink)

Appeals to human nature are ubiquitous, yet historically many have proven ill-founded. Why? How might frequent errors be remedied towards building a more robust and reliable scientific study of human nature? Our aim is neither to advance specific scientific or philosophical claims about human nature, nor to proscribe or eliminate such claims. Rather, we articulate through examples the types of errors that frequently arise in this field, towards improving the rigor of the scientific and social studies. We seek to analyze (...) such claims rhetorically, cognitively, and epistemically. Namely, how do we think about human nature? Claims about human nature, we show, are susceptible to widely exhibited deficits in cognitive tendencies such as framing, confirmation bias, satisficing, and teleological perspectives, as well as motivated reasoning. Such missteps foster methodological, empirical, and psychological mistakes and biases. Specifically, they promote the naturalizing error, whereby cultural ideology and values are projected onto an apparently objective description of nature. Concrete remedies are offered to aid scientists in conducting and reporting their research goals and findings more responsibly and effectively (relevant also to educators and other communicators who convey these findings publicly). Recommendations include acknowledging that human nature claims are often context-dependent, seeking multiple critical perspectives, and explicitly labeling uncertainties. (shrink)

Epistemologists have debated at length whether scientific discovery is a rational and logical process. If it is, according to the Artificial Intelligence hypothesis, it should be possible to write computer programs able to discover laws or theories; and if such programs were written, this would definitely prove the existence of a logic of discovery. Attempts in this direction, however, have been unsuccessful: the programs written by Simon's group, indeed, infer famous laws of physics and chemistry; but having found no new (...) law, they cannot properly be considered discovery machines. The programs written in the Turing tradition, instead, produced new and useful empirical generalization, but no theoretical discovery, thus failing to prove the logical character of the most significant kind of discoveries. A new cognitivist and connectionist approach by Holland, Holyoak, Nisbett and Thagard, looks more promising. Reflection on their proposals helps to understand the complex character of discovery processes, the abandonment of belief in the logic of discovery by logical positivists, and the necessity of a realist interpretation of scientific research. (shrink)

We have begun work on two separate but related ontologies for the study of neurological diseases. The first, the Neurological Disease Ontology (ND), is intended to provide a set of controlled, logically connected classes to describe the range of neurological diseases and their associated signs and symptoms, assessments, diagnoses, and interventions that are encountered in the course of clinical practice. ND is built as an extension of the Ontology for General Medical Sciences — a high-level candidate OBO Foundry ontology that (...) provides a set of general classes that can be used to describe general aspects of medical science. ND is being built with classes utilizing both textual and axiomatized definitions that describe and formalize the relations between instances of other classes within the ontology itself as well as to external ontologies such as the Gene Ontology, Cell Ontology, Protein Ontology, and Chemical Entities of Biological Interest. In addition, references to similar or associated terms in external ontologies, vocabularies and terminologies are included when possible. Initial work on ND is focused on the areas of Alzheimer’s and other diseases associated with dementia, multiple sclerosis, and stroke and cerebrovascular disease. Extensions to additional groups of neurological diseases are planned. The second ontology, the Neuro-Psychological Testing Ontology (NPT), is intended to provide a set of classes for the annotation of neuropsychological testing data. The intention of this ontology is to allow for the integration of results from a variety of neuropsychological tests that assay similar measures of cognitive functioning. Neuro-psychological testing is an important component in developing the clinical picture used in the diagnosis of patients with a range of neurological diseases, such as Alzheimer’s disease and multiple sclerosis, and following stroke or traumatic brain injury. NPT is being developed as an extension to the Ontology for Biomedical Investigations. (shrink)

[Alan Weir] This paper addresses the problem of how to account for objective content-for the distinction between how we actually apply terms and the conditions in which we ought to apply them-from within a naturalistic framework. Though behaviourist or dispositionalist approaches are generally held to be unsuccessful in naturalising objective content or 'normativity', I attempt to restore the credibility of such approaches by sketching a behaviouristic programme for explicating objective content. /// [Alexander Miller] Paul Boghossian (1989, 1990) has argued, (...) on grounds concerning the holistic nature of belief fixation, that there are principled reasons for thinking that 'optimal conditions' versions of reductive dispositionalism about content cannot hope to satisfy a condition of extensional accuracy. I discern three separable strands of argument in Boghossian's work-the circularity objection, the open-endedness objection, and the certification objection-and argue that each of these objections fails. My conclusion is that for all that Boghossian has shown, 'optimal conditions' versions of reductive dispositionalism have to be assessed on a case-by-case basis. (shrink)

This paper assesses the novelty of NSMs - or better, of any social and political movement in contemporary Western societies - in the light of their capacity to develop systems of relationships which cut across established social and political cleavages. It illustrates first the relational bases of Rokkan's concept of cleavage, and its contribution to the understanding of social movements; it then shows how Simmel's concept of the intersection of social circles and his distinction between concentric and crosscutting circles may (...) be fruitfully applied to the analysis of political cleavages and their changing forms. In the conclusions, the elements of an approach to the study of the newness of social movements, based on the integration of Rokkan's and Simmel's principles, are introduced. (shrink)

On the basis of Levin’s claim that truth is not a scientific explanatory factor, Michel Ghins argues that the “no miracle” argument (NMA) is not scientific, therefore scientific realism is not a scientific hypothesis, and naturalism is wrong. I argue that there are genuine senses of ‘scientific’ and ‘explanation’ in which truth can yield scientific explanations. Hence, the NMA can be considered scientific in the sense that it hinges on a scientific explanation, it follows a typically scientific inferential pattern (IBE), (...) and it is based on an empirical fact (the success of science). Scientific realism, in turn, is scientific in the sense that it is supported both by a meta-level scientific argument (the NMA), and by first level scientific arguments through semantic ascent and generalization. However, both the NMA and scientific realism are not purely scientific, since they go beyond properly scientific concerns, and require additional philosophical reasoning. In turn, naturalism is correct in the sense that philosophy is continuous with science, partly based on it, and potentially equally well warranted. Beside denying the scientific nature of the NMA, Ghins raises some objections to its cogency , to which I reply in the final section. (shrink)

El presente artículo es una breve aproximación al contexto legal y político de las comunidades judías catalanas entre 1240 y 1391. A través del uso combinado de fuentes hebreas y cristianas, se ofrecerá una síntesis de la compleja red de factores, reglas y teorías que moldearon el ecosistema social de las comunidades hebreas en Cataluña. En este sentido, el autogobierno comunal era el resultado de la convergencia entre la legislación real y la producción normativa y teórica de las comunidades. Nuestro (...) objetivo es presentar el carácter poliédrico de esta realidad a través de los privilegios concedidos por los monarcas aragoneses a sus súbditos judíos, los modelos políticos desarrollados por los intelectuales hebreos, la legislación interna de las comunidades y el conjunto de factores sociales e históricos que impulsaron la evolución del sistema comunal. (shrink)

This paper studies the notion of virtuality in the Bohr-Kramers-Slater theory of 1924. We situate the virtual entities of BKS within the tradition of the correspondence principle and the radiation theory of the Bohr model. We show how, in this context, virtual oscillators emerged as classical substitute radiators and were used to describe the otherwise elusive quantum transitions. They played an effective role in the quantum theory of radiation while remaining categorically distinct and ontologically separated from the quantum world of (...) the Bohr model. The notion of virtuality thus differs markedly from its counterpart in quantum mechanics or QFT. (shrink)

In this paper, it is presented a historical account of the formulation of the quantum relativistic wave equation of an electron – the Dirac equation, issues regarding its interpretation that arose from the very beginning, and the later formulation of this equation in relation to a quantized electron-positron field, which implies a new interpretation. The way in which solutions obtained under each interpretation of the equation relate to one another is also considered for the simple case of hydrogen-like problems.

Among the influential contributions of Alfred Tarski to logic and philosophy, and close in importance to his widely applied and discussed definition of truth, one finds his definition of logical consequence for formal languages. Like his definition of truth, Tarski's definition of logical consequence has been widely and fruitfully applied. Unlike the definition of truth, that of logical consequence has been rarely discussed philosophically. The main aim of this dissertation is to offer a thorough discussion of some philosophical issues arising (...) from the neglected definition. ;The point of departure is an interpretative reading of the relevant writings by Tarski. This reading yields historically interesting data that refute other recent readings. It also provides philosophical illumination, by clarifying how Tarski thought that his definition satisfied some pretheoretic desiderata. ;Next it is discussed whether Tarski's definition satisfies other pretheoretic desiderata, not stated by Tarski and in some cases not endorsed by him, but which are desiderata nonetheless from reasonable standpoints. These include the desiderata that all instances of logical consequence in Tarski's defined sense be instances of analytical implication, and that they be instances of valid implication. The conclusion of this part of the dissertation is that, under reasonable assumptions regarding the field of applicability of the definition and the concepts used in it, there are reasons to believe that these desiderata are met, and none to believe they are not. ;Finally, the problem of logical constants is examined. The concept of a "logical constant" is the only concept not taken from logic and mathematics that appears in Tarski's definition. The problem of logical constants is that of replacing the primitive 'logical constant' with a defined, better understood concept, and in a such a way that the resulting defined concept of logical consequence meets the previously discussed desiderata. The main conclusion of this part is that some attempts to do this replace the obscure with the more obscure, while other attempts that seem to be in the right spirit have shortcomings of their own. (shrink)