We prove strong completeness of the □-version and the ◊-version of a Gödel modal logic based on Kripke models where propositions at each world and the accessibility relation are both infinitely valued in the standard Gödel algebra [0,1]. Some asymmetries are revealed: validity in the first logic is reducible to the class of frames having two-valued accessibility relation and this logic does not enjoy the finite model property, while validity in the second logic requires truly fuzzy accessibility relations and this (...) logic has the finite model property. Analogues of the classical modal systems D, T, S4 and S5 are considered also, and the completeness results are extended to languages enriched with a discrete well ordered set of truth constants. (shrink)

In 2015 Dag Prawitz proposed an Ecumenical system where classical and intuitionistic logic could coexist in peace. The classical logician and the intuitionistic logician would share the universal quantifier, conjunction, negation and the constant for the absurd, but they would each have their own existential quantifier, disjunction and implication, with different meanings. Prawitz’ main idea is that these different meanings are given by a semantical framework that can be accepted by both parties. The aim of the present paper is [1] (...) to prove the normalization theorem for the propositional fragment NEp of Prawitz’ ecumenical system, and [2] to show that NEp is sound and complete with respect to a Kripke-style semantics for the language of NEp. (shrink)

In this paper we consider the modal logic with both \ and \ arising from Kripke models with a crisp accessibility and whose propositions are valued over the standard Gödel algebra \. We provide an axiomatic system extending the one from Caicedo and Rodriguez :37–55, 2015) for models with a valued accessibility with Dunn axiom from positive modal logics, and show it is strongly complete with respect to the intended semantics. The axiomatizations of the most usual frame restrictions are given (...) too. We also prove that in the studied logic it is not possible to get \ as an abbreviation of \, nor vice-versa, showing that indeed the axiomatic system we present does not coincide with any of the mono-modal fragments previously axiomatized in the literature. (shrink)

Semi-contraction is a withdrawal operation defined by Fermé in "On the logic of theory change: Contraction without recovery." In this paper we propose: (1) an axiomatic characterization of semi-contraction; (2) an alternative construction for semi-contraction based on semi-saturatable sets, inspired by Levi's saturatable sets; (3) a special kind of semi-contraction that satisfies the Lindström and Rabinowicz interpolation thesis.

Automatic public malware analysis services provide controlled, isolated and virtual environments to analyse malicious software samples. Unfortunately, malware is currently incorporating techniques to recognize execution onto a virtual or sandbox environment; when an analysis environment is detected, malware behaves as a benign application or even shows no activity. In this work, we present an empirical study and characterization of automatic PMAS, considering 26 different services. We also show a set of features that allow to easily fingerprint these services as analysis (...) environments; the lower the unlikeability of these features, the easier for us to fingerprint the analysis service they belong to. Finally, we propose a method for these analysis services to counter or at least mitigate our proposal. (shrink)

Alchourrón devoted his last years to the analysis of the notion of defeasible conditionalization. He developed a formal system capturing the essentials of this notion. His definition of the defeasible conditional is given in terms of strict implication operator and a modal operator f which is interpreted as a revision function at the language level. In this paper, we will point out that this underlying revision function is more general than the well known AGM revision [4]. In addition, we will (...) give a complete characterization of that more general kind of revision and will show how permits to unify models of revision given by other authors. Alchourrón dedicó sus últimos años al análisis de la noción de condicionalización derrotable. Desarrolló un sistema formal que captura los aspectos esenciales de esta noción. Su definición de condicional revisable está dada en términos del operador de implicación estricta y un operador modal f el cual es interpretado en el nivel del lenguaje como una función de revisión. En este trabajo señalamos que la función de revisión subyacente es más general que la bien conocida función de revisión de AGM. Además, presentaremos una caracterización completa de una clase de revisión más general y mostraremos cómo nuestro modelo permite unificar los modelos de revisión propuestos por otros autores. (shrink)

Abstract:Cristina Crichton speaks with Ramón Rodríguez about ethics in Heidegger (Studies) and Heidegger's influence on his own work.

Las investigaciones que Carlos Alchourrón desarrolló en la Filosofía del Derecho se vincularon, desde inicios de la década de 1980, con problemáticas críticas de la Inteligencia Artificial. Su contribución a la construcción de una lógica de las normas se conectó rápidamente con la deducción automática y los Sistemas Expertos Jurídicos. Su preocupación por la cuestión de los conflictos de obligaciones que pueden plantearse en un sistema normativo cuando el juez se enfrenta a la necesidad de emitir un veredicto considerando ciertos (...) hechos, se vinculó, en sus trabajos, con la noción más general de "condicionales derrotables" y con la formalización del Razonamiento No Monótono. Pero su contribución de mayor impacto fue aquella derivada de la búsqueda de una solución al problema de los resultados múltiples que surgen de la derogación de una norma en un sistema jurídico, problema que puede ser visto, en un contexto epistémico, como el de la contracción de un conjunto de creencias. Su enfoque constructivo, que desarrolló con David Makinson, convergió con el axiomático elaborado por Peter Gärdenfors, dando lugar al surgimiento de la teoría de los Cambios Racionales de Creencias, más conocida como AGM, teoría que fue adoptada en IA como un modelo standard para la especificación de las actualizaciones de Bases de Conocimiento, operaciones que, habitualmente, involucran la introducción de una nueva creencia que puede ser inconsistente con las anteriores. ¿Por qué AGM adquirió rápidamente carta de ciudadanía en IA, al punto de que su influencia, medida según la cantidad de menciones bibliográficas del artículo fundacional de 1985, se ha duplicado en la última década? Mostraremos en este trabajo que la teoría apareció en un momento de crisis de la IA y que el alto nivel de abstracción del modelo de AGM era lo que muchos investigadores de la disciplina estaban buscando. El presente artículo, luego de describir la génesis de AGM, realiza un análisis histórico de las circunstancias en las cuales la teoría se introdujo en la IA y una evaluación cuantitativa y cualitativa de su impacto en dicha disciplina. The main lines of research that Carlos Alchourrón developed in the Philosophy of Law, were connected, from the beginnings of the 80' s, to some critical problems in the Artificial Intelligence. His contributions to the construction of a logic of norms were rapidly linked to automatic deduction and the Legal Expert Systems. His concerns for the conflict of obligations that could arise in a normative system when a judge has to issue a ruling taking some particular facts into account were associated in his work with the more general notion of "defeasible conditionals" and with the formalization of Non Monotonic Reasoning. But his most relevant contribution was the one derived from the search of a solution to the problem of multiple outcomes resulting from the derogation of a norm in a legal corpus, which may be considered -within an epistemic framework- analogous to the contraction of a set of beliefs. The constructive approach he worked out with David Makinson converged with Peter Gärdenfors' axiomatic, giving rise to the formulation of the theory of Rational Changes of Belief, which was adopted in AI as a model for the specification of the updates of Knowledge Bases as it usually involves a new belief that may be inconsistent with the old ones. (shrink)

La contribución de David Gauthier a la filosofía moral es poco conocida en nuestro país, a pesar de ser uno de los más novedosos y originales aportes que en materia de ética se han desarrollado en las últimas décadas en el ámbito norteamericano. El uso de la Teoría de la elección racional y de la teoría de los juegos hace que sus tesis morales contractualistas resulten muy interesantes a la luz del neocontractualismo. Algunos comentaristas han sostenido que desde la Teoría (...) de la justicia de John Rawls el contractualismo no volaba tan alto. En este trabajo se presenta de forma muy sintética la tesis de Gauthier, a la vez que se cuestiona la validez de su proyecto a la luz de sus posibilidades de aplicación práctica. (shrink)

The pandemic had serious implications for university education, specifically due to the transition from face-to-face teaching to online methodologies. This article analyzes the perception of students undergoing speech therapy from a Chilean University about the E-portfolio incorporation as an evaluative tool during the emergency virtual teaching due to the COVID-19 pandemic. From quantitative research, a survey of 38 questions based on Likert scales was applied to 108 penultimate year undergraduate students. The survey demonstrated that there is an improvement in the (...) methodology and teaching support, as well as in the creativity and professionalism of the students. (shrink)

Tradición patrimonial y administración señorial en la América Latina Aspectos básicos del liberalismo brasileño del siglo XIX - El pensamiento conservador en Colombia, a lo largo del siglo XIX - El pensamiento conservador en Colombia, a lo largo del siglo XX - Iberoamérica como totalidad - Clientelismo mesianismo y liberación en la cultura Latinoamericana - Catequesis misionera y "saber de salvación" en el Brasil colonial - La filosofía brasileña en los siglos XVII, XVIII y XIX - La filosofía brasileña en (...) el siglo XX - Positivismo y realidad Latinoamericana - Cinco concepciones de la integración Latinoamericana - Etica y política en la cultura brasileña - Catolicismo y modernidad : la función moralizadora de la iglesia. (shrink)

Historicismo y Marxismo. El Historicismo, Ludovico Geymonat y la disputa en torno al Marxismo como método o concepción de mundo.

Este artículo es una revisión de la capacidad de los herbarios fotográficos para establecer posibles alianzas experimentales con potencial para ayudar en la concienciación y resolución de la crisis de biodiversidad vegetal. Se analiza cómo el medio fotográfico, bajo el prisma de la creación artística, puede erigirse como un sistema revelador, capaz de superar la mera descripción y ampliar las limitaciones cognitivas de nuestra percepción visual, desvelando la complejidad del universo botánico mediante una mirada más profunda y poética de su (...) naturaleza física. (shrink)

Asia, America, and Europe have been intellectually intertwined for centuries. Several studies have been published revealing European scholars’ interest in the “exotic” languages of Asia and America, as well as in ethnographic and anthropological aspects. Some scholars such as Polymath Leibniz (1646–1716), were interested in these languages in an attempt to construct a universal language, while others tried to establish language families, like the Jesuit Hervás y Panduro (1735–1809). However, all acknowledge the importance of language and the circulation of knowledge. (...) This paper analyzes the dissemination of the compilation of eighteenth‐century multilingual lexical compilations for comparative purposes as an early globalized project. These compilations were designed by European scholars and subsequently elaborated in different languages by missionaries, explorers, and scientists in the Philippines and America. Taking the correspondence and relations between botanist Mutis (1732–1808) and bureaucrats, European scientists such as polymath Humboldt (1769–1859) and Botanist Linnaeus (1707–1778) among others, and navy officers of the scientific exploration commanded by Malaspina (1754–1809) and Bustamante y Guerra (1759–1825) into consideration, I will analyze how simultaneous projects followed a unified aim, and illustrate their substantial contribution to the study of language in the late eighteenth century. (shrink)

In this paper we provide a simplified, possibilistic semantics for the logics K45, i.e. a many-valued counterpart of the classical modal logic K45 over the [0, 1]-valued Gödel fuzzy logic \. More precisely, we characterize K45 as the set of valid formulae of the class of possibilistic Gödel frames \, where W is a non-empty set of worlds and \ is a possibility distribution on W. We provide decidability results as well. Moreover, we show that all the results also apply (...) to the extension of K45 with the axiom, provided that we restrict ourselves to normalised Gödel Kripke frames, i.e. frames \ where \ satisfies the normalisation condition \ = 1\). (shrink)