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)

In this work we propose an encoding of Reiter’s Situation Calculus solution to the frame problem into the framework of a simple multimodal logic of actions. In particular we present the modal counterpart of the regression technique. This gives us a theorem proving method for a relevant fragment of our modal logic.

Traditionally, consistency is the only criterion for the quality of a theory in logic-based approaches to reasoning about actions. This work goes beyond that and contributes to the metatheory of actions by investigating what other properties a good domain description should have. We state some metatheoretical postulates concerning this sore spot. When all postulates are satisfied we call the action theory modular. Besides being easier to understand and more elaboration tolerant in McCarthy’s sense, modular theories have interesting properties. We point (...) out the problems that arise when the postulates about modularity are violated, and propose algorithmic checks that can help the designer of an action theory to overcome them. (shrink)

We investigate an aspect of defeasibility that has somewhat been overlooked by the non-monotonic reasoning community, namely that of defeasible modes of reasoning. These aim to formalise defeasibility of the traditional notion of necessity in modal logic, in particular of its different readings as action, knowledge and others in specific contexts, rather than defeasibility of conditional forms. Building on an extension of the preferential approach to modal logics, we introduce new modal osperators with which to formalise the notion of defeasible (...) necessity and distinct possibility, and that can be used to represent expected effects, refutable knowledge, and so on. We show how KLM-style conditionals can smoothly be integrated with our richer language. We also propose a tableau calculus which is sound and complete with respect to our modal preferential semantics, and of which the computational complexity remains in the same class as that of the underlying classical modal logic. (shrink)

Modal accounts of normality in non-monotonic reasoning traditionally have an underlying semantics based on a notion of preference amongst worlds. In this paper, we motivate and investigate an alternative semantics, based on ordered accessibility relations in Kripke frames. The underlying intuition is that some world tuples may be seen as more normal, while others may be seen as more exceptional. We show that this delivers an elegant and intuitive semantic construction, which gives a new perspective on defeasible necessity. Technically, the (...) revisited logic does not change the expressive power of our previously defined preferential modalities. This conclusion follows from an analysis of both semantic constructions via a generalisation of bisimulations to the preferential case. Reasoners based on the previous semantics therefore also suffice for reasoning over the new semantics. We complete the picture by investigating different notions of defeasible conditionals in modal logic that can also be captured within our framework. (shrink)

There are various contexts in which it is not pertinent to generate and attend to all the classical consequences of a given premiss—or to trace all the premisses which classically entail a given consequence. Such contexts may involve limited resources of an agent or inferential engine, contextual relevance or irrelevance of certain consequences or premisses, modelling everyday human reasoning, the search for plausible abduced hypotheses or potential causes, etc. In this paper we propose and explicate one formal framework for a (...) whole spectrum of consequence relations, flexible enough to be tailored for choices from a variety of contexts. We do so by investigating semantic constraints on classical entailment which give rise to a family of infra-classical logics with appealing properties. More specifically, our infra-classical reasoning demands (beyond ${\alpha\models\beta}$ ) that Mod(β) does not run wild, but lies within the scope (whatever that may mean in some specific context) of Mod(α), and which can be described by a sentence ${\bullet\alpha}$ with ${\beta\models\bullet\alpha}$ . Besides being infra-classical, the resulting logic is also non-monotonic and allows for non-trivial reasoning in the presence of inconsistencies. (shrink)

In this research, a sliding mode regulator with sine mapping is suggested for the stabilization of electricity generators being affected by magnet interaction nonlinearities and generator nonlinearities. To reach this goal, our suggested regulator has the following contributions: it starts from the sliding mode regulator with the modifications that the saturation mapping is used to reach a smoother performance instead of the signum mapping, and the sine mapping is applied to reach an upper bound in the proportional gain error, it (...) is used to reach some chosen constant behaviors for the angle position, angle speed, and current in the electricity generators, and its stabilization is ensured based on the Lyapunov approach. We show the simulation of the suggested regulator in two electricity generators. (shrink)

After the seminal work of Kraus, Lehmann and Magidor (formally known as the KLM approach) on conditionals and preferential models, many aspects of defeasibility in more complex formalisms have been studied in recent years. Examples of these aspects are the notion of typicality in description logic and defeasible necessity in modal logic. We discuss a new aspect of defeasibility that can be expressed in the case of temporal logic, which is the normality in an execution. In this contribution, we take (...) Linear Temporal Logic (LTL) as case study for this defeasible aspect. LTL has found extensive applications in Computer Science and Artificial Intelligence, notably as a formal framework for representing and verifying computer systems that vary over time. However, some systems may presents exceptions at some innocuous time points where they can be tolerated, or conversely, exceptions at other crucial time points where they need to be addressed. In order to ensure the reliability of such systems, we study a preferential extension of LTL, called defeasible linear temporal logic (LTL ~ ). In the first part of this paper, we show how semantics of KLM's preferential models can be integrated with LTL. We also discuss the addition of non-monotonic temporal operators as a way to formalise defeasible properties of these systems. The second part of this paper is a study of the satisfiability problem of LTL ~ sentences. Based on Sistla and Clarke's work on the complexity of the classical LTL language, we show the bounded-model property of two fragments of LTL ~ language. Moreover, we provide a procedure to check the satisfiability of sentences in both of these fragments. (shrink)

El objetivo de este trabajo es analizar la distribución espacial de población indígena a nivel metropolitano, identificando posibles patrones espaciales de segregación, para lo cual se utilizan el Índice de Segregación Areal (ISEA) y el Índice de Moran Local. Lo anterior se realiza primero mediante una aproximación y análisis de variables censales que miden el uso de la lengua y la pertenencia a hogares indígenas. Los principales resultados indican que sí existen espacios urbanos con población indígena segregada, aunque con distintos (...) escenarios y características espaciales de distribución, algunos más centralizados, otros en intersticios y con dispersión en las periferias. (shrink)

IntroductionThe aim of the present study is to carry out a multidimensional analysis on the relation between satisfaction with social support received, resilience and optimism in cancer patients and their quality of life.Materials and MethodsData were gathered through questionnaires fulfilled by 142 cancer patients. Data relate to sociodemographic, health, quality of life, social support, resilience and optimism.ResultsSatisfaction with the sources and types of support, resilience and optimism relates positively with quality of life. Predictive models show that informational support from friends (...) is the variable that most increases patients’ general health, while emotional support from the partner is the one that best improves how patients cope with the disease. In the same line, emotional support from the partner, together with informational support from family are the ones that most contribute to reduce patients’ symptoms. Resilience improves general health and functioning, and reduces symptoms. Patients’ optimism and resilience also reduce symptoms. Gender differences were found, with females showing lower quality of life than males, mainly in how they cope with cancer. Patients in the stage of treatment showed lower quality of life and higher symptoms. Such increase was observed in patients who received hormonotherapy or chemotherapy.DiscussionImportant practical implications can be drawn from results, which could help improve cancer patients’ quality of life through intervention strategies aimed at increasing their resilience, optimism and the social support provided by their closer sources. (shrink)

Jose Marti contributed greatly to Cuba's struggle for independence from Spain with words as well as revolutionary action. Although he died before the formation of an independent republic, he has since been hailed as a heroic martyr inspiring Cuban republican traditions.

The so-called uncontrolled donation after circulatory determination of death (uDCDD) have been implemented in several countries, including Spain and France, to increase the availability of organs for transplantation. These protocols allow obtaining kidneys, livers and lungs of patients who do not survive cardio-pulmonary resuscitation performed in out-of-hospital settings. Simultaneously with the development and recent proliferation of these protocols, some emergency teams have begun to employ unconventional methods of CPR, with still uncertain but promising results. The coexistence of these two possibilities (...) raises some questions: At what point should attempts to save a patient with circulatory arrest be abandoned so that this individual can begin to be considered as a potential organ donor? How to manage potential conflicts of loyalties that may arise within emergency and procurement teams? How should the information to the families of those patients and potential organ donors be managed? This article gathers the conclusions of a workshop in which an interdisciplinary working group addressed these and other questions related to DCDD and non-conventional CPR. (shrink)

IntroductionThe present study aims at analysing how social support received and provided by parents of children, adolescents and young adults (AYA) diagnosed with cancer, as well as their sociodemographic and clinical variables, affect those parents’ stress levels and life and family satisfaction.Materials and MethodsA total of 112 parents of children and AYAs who had been diagnosed with cancer and who received treatment in Malaga participated in the study. In the study, participated all parents who voluntarily agreed to fulfil the questionnaire. (...) The main inclusion criterion was that their child had cancer. Instruments used were Questionnaire on the Frequency of and Satisfaction with Social Support (QFSSS), Paediatric Inventory for Parents (PIP), Life Satisfaction Scale and Family Satisfaction Scale.ResultsIn the mean difference analyses, male parents showed 3.38 (SD = 0.56) in social support received and female parents showedM = 3.08 (SD = 0.72). Conversely, in social support provided, female parents showed 3.22 and male parents showedM = 3.55 (p = 0.020). Significant differences were also found in family satisfaction, where female parents (M = 3.64) feel more satisfied than male parents (M = 3.06;p = 0.027). Parents of children aged between 0 and 14 years (M = 3.06) feel more stress than those parents of children aged 15–21 (M = 2.61;p = 0.021). The correlation analysis shows that there is a negative and significant relation between stress levels experienced by parents when facing different situations related to the child’s disease and both types of support, receivedr = −0.411,p < 0.001 and providedr = −0.282,p < 0.01. There is also a positive and significant relation between life satisfaction and social support receivedr = 0.292,p < 0.01, and social support providedr = 0.409,p < 0.001. There is a positive and significant relation between family satisfaction and social support receivedr = 0.330,p < 0.01, in the same way as with social support providedr = 0.222,p < 0.05. The regression analysis related to stress levels of parents indicates that social support received predicts levels of stress significantlyp < 0.001, with the variable of number of children being the one that showed to be significantp < 0.05. Social support provided showed the most significant resultsp = 0.001, meaning that social support provided increased life satisfaction. Social support received explains family satisfaction (p = 0.50), as it increases the family satisfaction of parents of children with cancer.DiscussionAnalysing social support received and provided, as well as sociodemographic and clinical variables, allowed us to broaden the knowledge on the effect social support has on stress levels, life satisfaction and family satisfaction in parents of children and AYAs diagnosed with cancer. This may have relevant practical implications for the design of interventions that would improve parents’ lives. (shrink)

Assessing physical fitness has emerged as a proxy of the health status of children and adolescents and therefore as relevant from a public health point of view. DAFIS is a project included in Plan Galicia Saudable of the regional government of Galicia. DAFIS consists of an on-line software devoted to record the results of a standard physical fitness protocol carried out as a part of the physical education curriculum. The aims of this study were: to obtain normative values of physical (...) fitness of the Galician school population evaluated in the DAFIS project, and to identify a reduced number of components and tests able to capture a significant amount of the variability in the physical fitness of children and adolescents. From an initial sample of 27784 records, 15287 cases were considered after filtering. Generalized Additive Models for Location, Scale and Shape were used for obtaining percentile curves and tables for each sex. Furthermore, a principal components analysis was performed, selecting the number of components by applying the Kaiser’s rule and selecting a subset of variables considering the correlation between each variable and the components. Percentile curves and normative values are reported for each test and sex. Physical fitness was better in boys than in girls throughout age groups, except for flexibility that was consistently higher in girls. Two main components were detected throughout age groups: the first one representing body composition and partially cardiorespiratory fitness and the second one muscular fitness. For boys and girls, waist to height ratio had the highest correlations with the first component in four out of six age groups. The highest correlation with the second component, was most frequently observed for the handgrip test both in boys and girls. This study provides evidence about the utility of school community actions like DAFIS aimed to track the health-related fitness of children and adolescents. The results suggest that fat mass distribution and muscular performance concentrate a high proportion physical fitness variance. (shrink)

A 20 años de su publicación, el libro de José Casanova Public Religions in the Modern World ya es uno de los clásicos de la sociología de la religión y uno de los trabajos que mayores aportes ha hecho a la discusión sobre la secularización, la modernización, el pluralismo y las religiones públicas. Con el título Genealogías de la secularización, se publicó la recopilación del profesor Josetxo Beriain de 14 trabajos del profesor de Georgetown University aparecidos en los últimos (...) años en revistas especializadas y volúmenes colectivos, dejándonos a sus lectores la tarea de releerlos y encontrar tópicos que permitan sistematizarlos. (shrink)

Se hace una reseña del libro de Iván Almeida: La ilustre incertidumbre. Ensayos sobre Borges y la filosofía. Pittsburgh: Centro Borges-Universidad de Pittsburgh, 341 páginas.

Nesse artigo temos como objetivo analisar a representação do conceito de liberdade na primeira temporada da série “Merli”, veiculada no canal de streaming Netflix. Nela, pretendemos verificar como o professor de Filosofia Merli Bergeron trabalha conceitos libertários e suscita reflexões críticas em seus alunos sobre os padrões de convívio socialmente impostos pelas instituições primárias e secundárias. Ao mesmo tempo, pretendemos abordar a personalidade do professor, discutindo sobre o convívio que ele mantém com os colegas de trabalho e seus alunos, assim (...) como em sua vida particular, para visualizarmos se, de fato, ele pratica aquilo que discursa aos estudantes durante suas aulas. Haverá um foco maior na relação dele com o aluno Ivan Basco, que sofre com agorafobia e recebe aulas particulares de Merli para superar sua situação de isolamento. Em um primeiro momento, com caráter introdutório, iremos discutir sobre a importância da discussão de liberdade na contemporaneidade. A seguir, exporemos conceitos formulados por diversos pensadores acerca do que é a liberdade e sua importância para a emancipação humana. A partir disso, serão abordadas informações básicas sobre a produção da série, como os diretores, veiculadores e atores envolvidos para, por fim, executarmos a análise dos capítulos do seriado e apresentarmos nossas considerações finais. Diversos teóricos pertinentes a esse trabalho serão utilizados na revisão bibliográfica. Como metodologias de análise fílmica usaremos, para verificação estrutural do filme, a metodologia de análise fílmica de Manuela Penafria e, para visualização das formas simbólicas, a Hermenêutica de Profundidade, proposta por John Thompson em “Ideologia e Cultura Moderna”. (shrink)

Los autores que dialogan en el número 27 de Ístmica con sus respectivos cuentos; el guatemalteco Francisco Alejandro Méndez y el costarricense Iván Molina Jiménez, han encontrado maneras subrepticias y transtemporales de erizarnos la piel a través de la narrativa que nos ofrecen en esta edición. Méndez (1964), es periodista, crítico literario, catedrático universitario y reconocido escritor del istmo, quien obtuvo el Premio Nacional de Literatura de Guatemala en el 2017. Ha publicado los siguientes libros de novela y cuento: Graga (...) y otros cuentos (Editorial Serviprensa Centroamericana, Guatemala, 1991), Manual para desaparecer (Arco Iris, El Salvador, 1997), Sobrevivir para contarlo (Praxis, México, 1999), Crónicas suburbanas (Editorial X, Guatemala, 2001), Ruleta rusa (Fondo de cultura económico, México-Guatemala, 2001), Completamente Inmaculada (Perro azul, San José de Costa Rica, 2002), Reinventario de ficciones. Catálogo marginal de bestias, crímenes y peatones (La Tatuana, Guatemala, 2006), Les ombres du jaguar et autres nouvelles (Éditions Equilibrio, París, 2009), Juego de muñecas. Un caso más para Wenceslao Pérez Chanán, (Editorial FLACSO, Guatemala, 2012) y Triple Play, (Germinal, Costa Rica, 2013).Como investigador, también ha publicado los siguientes ensayos de crítica literaria: América Central en el ojo de sus críticos (Universidad Rafael Landívar, Guatemala, 2005), Hacia un nuevo canon de la vanguardia en América Central (Ed. Cultura, Guatemala, 2006) y Diccionario de Autores yCríticos de Guatemala (La Tatuana, Guatemala, 2010).Por su parte, Molina (1961), es historiador y escritor de ciencia ficción costarricense, autor, coautor o editor de numerosos estudios sobre historia de CostaRica, en particular, y de Centroamérica, en general. Es catedrático de la Escuela de Historia e investigador del Centro de Investigación en Identidad y CulturaLatinoamericanas (CIICLA) de la Universidad de Costa Rica. Ha obtenido el Premio Nacional de Historia (1991), el Premio de la Academia de Geografía eHistoria (1991), el Premio Áncora del periódico La Nación (1992), el Premio al Investigador en Ciencias Sociales (2015) y el Premio Luis Ferrero de Investigación Cultural (2016). Entre sus investigaciones más recientes figuran: La educación en Costa Rica de la época colonial al presente (EUNA, Costa Rica, 2016) y Príncipes de las remotidades. Carlos Luis Fallas y los escritores proletarios costarricenses (EUNED, Costa Rica, 2016). En el género de la ciencia ficción hapublicado varios libros de cuentos cortos y algunos de sus relatos han sido incluidos en recopilaciones y revistas publicadas en México, Colombia, Perú, España, Argentina, Estados Unidos y Cuba. Su más reciente libro de ciencia ficción es Las fugitivas de Abidos (La Jirafa y Yo, Costa Rica, 2017).En los cuentos de ambos autores que presentamos en esta edición, confluyen la creación de una atmósfera de suspenso, que puede originar desde aparentes alucinaciones hasta revivir temores atávicos. En este encuentro convergen monstruos reales y ficticios -aunque nos cueste diferenciarlos-, así como las neurosis del siglo XXI y las leyendas del siglo XIX, que aliviadas unas por el psicoanálisis y alimentadas otras, por los primeros experimentos de “ingeniería genética”, consiguen sembrarnos una interrogante sobre la (in)distinción de lo real en nuestro entorno. (shrink)

Religión sin dios, obra póstuma de Ronald Dworkin, es una interesante propuesta del filósofo del derecho es-tadounidense sobre las relaciones entre creyentes y ateos. Este corto libro consta de cuatro capítulos: “Ateísmo religio-so”, “El universo”, “Libertad religiosa” y 1Introduje algunos cambios a las citas de la traducción del Fondo de Cultura Económica, para aproximar el texto a la versión publicada en inglés. Agradezco a José Miguel Rueda su ayuda con la traducción.“Muerte e inmortalidad”. Me voy a cen-trar en la (...) discusión acerca del concepto de religión, entendida en el marco de lo que Dworkin llama la independencia ética, es decir, la idea según la cual la religión es solo una convicción como cualquier otra que tienen los individuos. (shrink)

El éxodo de más de 5,6 millones de venezolanos representa un fenómeno migratorio con múltiples facetas, cada una merecedora de atento análisis y profundización. Ante la dimensión del movimiento de millones de seres humanos, se corre el riesgo de subestimar tragedias que ocurren dentro del drama migratorio. Una de ellas, es el exilio de científicos y académicos. Bajo esta perspectiva, la investigación tiene como objetivo general mostrar la banalización frente al riesgo de pérdida de talento y avance científico de países (...) en vías de desarrollo. Tomamos como objeto de estudio el caso de la Diáspora Científica Venezolana. Se abordan de forma multidisciplinar tres ejes temáticos: 1) Causas y consecuencias de la Ciencia en Riesgo, 2) Instrumentalización de la Ciencia en Riesgo y 3) Efectividad de programas dirigidos a científicos en riesgo. El primer eje temático, está fundamentado en analizar las causas y consecuencias de la Diáspora científica venezolana, centrándonos en los estudios realizados, desde el ámbito sociológico, de Iván de la Vega, Francisco Kerdel-Vegas y Tomás Páez. El segundo eje establece, desde el marco filosófico habermasiano-marcusiano, la conveniente preservación del statu quo de la Ciencia en riesgo, a través de instrumentalización y unidimensionalidad del quehacer científico en países en vías de desarrollo por parte de programas internacionales financiados por organismos privados y gubernamentales. El tercer y último enfoque tiene como punto de partida la situación actual de la diáspora científica y la exposición de soluciones eficaces que rompan la inercia presente, enmarcando las ideas dentro de la actual crisis de la posmodernidad. Palabras Claves: diáspora venezolana, instrumentalización, ciencia, riesgo. (shrink)

This book explores the epistemic side of racial and sexual oppression. It elucidates how social insensitivities and imposed silences prevent members of different groups from listening to each other.

In this article, we examine the political and educational relevance of Hannah Arendt’s account of friendship. Drawing from Arendt’s central works on friendship, we offer a novel interpretation of the concept by connecting the notion with the idea of educational ‘love for the world’, amor mundi. With this interpretation, we seek to demonstrate that the concept of friendship has both direct educational and indirect political significance. Thereby, we distinguish our interpretation from two previous understandings of the educational relevance of the (...) Arendtian notion of friendship—those by (1) Aaron Schutz and Marie G. Sandy, and (2) Morten T. Korsgaard—in which friendship is either assigned a specifically political role (as in (1)) or its significance to education is narrowly understood (as in (2)). We argue our interpretation of friendship offers both a new contribution to the understanding of the relationship between education and politics in the context of Arendt scholarship, and a novel way of thinking about the educational significance of friendship in the context of contemporary democratic politics, especially the prevailing political polarization. (shrink)

Introduction 'Indoctrination' belongs to a family of concepts which includes ' teaching', 'education', 'instruction', and 'learning'. ...

"The medical establishment has become a major threat to health. The disabling impact of professional control over medicine has reached the proportions of an epidemic. Iatrogenesis, the name for this new epidemic, comes from iatros, the Greek word for physician, and genesis, meaning origin. Discussion of the disease of medical progress has moved up on the agendas of medical conferences, researchers concentrate on the sick-making powers of diagnosis and therapy, and reports on paradoxical damage caused by cures for sickness take (...) up increasing space in medical dope-sheets [...] The public has been alerted to the perplexity and uncertainty of the best among its hygienic caretakers [...] This book argues that panic is out of place. Thoughtful public discussion of the iatrogenic pandemic, beginning with an insistence upon demystification of all medical matters, will not be dangerous to the commonweal."-- from Introduction. (shrink)

Lackey’s (2007) class of “selfless assertions” is controversial in at least two respects: it allows propositions that express Moorean absurdity to be asserted warrantedly, and it challenges the orthodox view that the speaker’s belief is a necessary condition for warranted assertibility. With regard to the former point, I critically examine Lackey’s broadly Gricean treatment of Moorean absurdity and McKinnon’s (2015) epistemic approach. With regard to the latter point, I defend the received view by supporting the knowledge account, on which knowledge (...) is the necessary condition for warranted assertion. After examining two defenses of KA, by Montminy and Turri, I propose two alternative approaches. Although I remain neutral between them, I develop in more detail the view which classifies “selfless assertions” as “presentations”, a type of assertives distinct from genuine assertions. This account is motivated further by allowing for the expansion of the normative approach to other assertives, a feature we may be interested in, in the light of a recent wave of normative accounts of speech acts. (shrink)

O utopianismo científico de Neurath é a proposta para que as ciências sociais se envolvam na elaboração, desenvolvimento e comparação de cenários contrafactuais, as ‘utopias’. Tais cenários podem ser entendidos como peças centrais de experimentos de pensamento científicos, isto é, em exercícios da imaginação que não apenas promovem a revisão conceitual, mas também estimulam a criatividade para lidar com problemas vivenciados, já que utopias são esforços para imaginar como o futuro poderia ser. Ademais, experimentos de pensamento utópicos podem oferecer conhecimento (...) científico para informar debates e decisões políticas, contribuindo para formatar a sociedade. Este ensaio reconstrói um evento histórico como um exemplo da metodologia utopianista de Neurath. No final dos anos 1970 e início dos anos 1980, uma comissão científica e política designada pelo parlamento da Alemanha Ocidental inventou e comparou quatro cenários para políticas energético-econômicas futuras. Conclusões da comissão informaram decisões políticas que puseram a Alemanha Ocidental (e depois reunificada) em um caminho para se tornar uma potência industrial verde. Uma parte fundamental do trabalho da comissão envolveu um apelo à imaginação, permitindo a caracterização sob a metodologia de Neurath. (shrink)

The "theory of mind" framework has been the fastest growing body of empirical research in contemporary psychology. It has given rise to a range of positions on what it takes to relate to others as intentional beings. This book brings together disparate strands of ToM research, lays out historical roots of the idea, and indicates better alternatives.

"Ivan Illich alights on such topics as education, history, language, politics, and the church. The conversations range over the whole of Illich's published work and public career as a priest, vice-rector of a university, founder of the Centre for Intercultural Documentation in Cuernavaca, Mexico, and author of such classics as Tools for Conviviality, Medical Nemesis, and Deschooling Society.".

_Epistemic Logic_ studies statements containing verbs such as 'know' and 'wish'. It is one of the most exciting areas in medieval philosophy. Neglected almost entirely after the end of the Middle Ages, it has been rediscovered by philosophers of the present century. This is the first comprehensive study of the subject. Ivan Boh explores the rules for entailment between epistemic statements, the search for the conditions of knowing contingent propositions, the problems of substitutivity in intentional contexts, the relationship between (...) epistemic and modal logic, and the problems of composite and divided senses in authors ranging from Abelard to Frachantian. (shrink)