Irrevocable belief revision and epistemic entrenchment

In recent papers [10, 11] Krister Segerberg introduced Irrevocable Belief Revision, as closely related to AGM revision [2]. In this paper we present irrevocable belief revision in terms of an epistemic entrenchment relation.1info:eu-repo/semantics/publishedVersio

El uso de los recursos leñosos entre grupos cazadores-recolectores patagónicos : estudio de la movilidad a partir de la arqueobotánica

Tradicionalmente, en arqueología, el conocimiento de los territorios de captación ha sido caracterizado a partir de la determinación de la procedencia de las materias primas abióticas. Sin embargo, material leñoso también pueden ofrecer datos sobre los las estrategias de movilidad de un grupo. Los resultados obtenidos en el sitio Orejas de Burro 1 (Santa Cruz, Argentina) permiten sugerir distintas vías de circulación en relación a la adquisición de la madera: "interior-costa" y "hacia o desde la cordillera de los Andes".Traditionally, in archeology, knowledge about catchment areas has been characterized through the identification of abiotic raw material sources. However, woody material can provide data about mobility strategies of groups. The results from the archaeological site Orejas de Burro 1 (Santa Cruz, Argentina) allow us to suggest different ways of movement related with wood acquisition: "inland - coast" and "out and from the Andes"

Project "OAE" at GANIL a project for increasing the heavy ion energies

International audienceGANIL is composed of three cyclotrons connected in series, with a stripper located between the last two stages. The general parameters have been chosen to fit the characteristics of the PIG ion source. With the advent of ECR sources, which can produce efficiently ions of higher charge state, an optimization of the system has been considered which will result in an increase of the energy range of medium and heavy ions. A few modifications of the machine are necessary and should be carefully prepared so as to minimize the duration of the shut-down planned at the beginning of 1989. Moreover, a systematic study of the axial injection of the first cyclotron has been undertaken in order to improve the intensity of the injected beam with respect to space charge

On the logic of theory change: wr contraction without recovery

The postulate of Recovery, among the six postulates for theory contraction, formulated and studied by Alchourrón, Gardenfors and Makinson [AM82, AGM85, AM85, Mak87, Gar88] has been the one that more controversies provoked [Mak87, HAN91, see]. There are clearly cases in wich the recovery postulate seems to be contrary to intution.Eje: 2do. Workshop sobre aspectos teóricos de la inteligencia artificialRed de Universidades con Carreras en Informática (RedUNCI

Iterated belief change: the case of expansion into inconsistency

Constructing models that allow iterated changes is one of the most studied problems in the literature on belief change. However, up to now, iteration of expansion was only studied as a special case of consistent revision and, as far we know, there is no work in the literature that deals with expansions into inconsistency in a supraclassical framework. In this paper, we provide a semantics for iterated expansion, as well as its axiomatic characterization. We extend the model to two well-known families of iterated belief change (natural and lexicographic). Iteration of expansion can be combined with existent models of iteration of revision and contraction. Since we are able to accommodate different inconsistent belief states, iteration of expansion allows us to define new belief change functions that are currently only defined for belief bases: semi revision, external revision, as well as consolidation.info:eu-repo/semantics/publishedVersio

On the logic of theory change: contraction without recovery

The postulate of Recovery, among the six postulates for theory contraction, formulated and studied by Alchourron, G ´ ardenfors and Makinson is the one that has provoked most controversy. ¨ In this article we construct withdrawal functions that do not satisfy Recovery, but try to preserve minimal change, and relate these withdrawal functions with the AGM contraction functions.info:eu-repo/semantics/publishedVersio

Using decision theory for analyzing enrollment in a scientific study in the health area

This article explores the current literature about the factors that lead people to enroll in a scientific study in the area of health. Recruitment of participants has been shown to be a problem with the number of participants willing to participate decreasing widely. For this reason, it is important to understand how and why people make the decision to participate in a scientific study, in order to develop mechanisms that counteract this tendency. For that purpose, a review of current literature was conducted and the evidence was related with decision theory. The goal is to understand how the decision process to participate in a study occurs and which actions can be taken to maximize the recruitment process.info:eu-repo/semantics/publishedVersio

AGM 25 years: twenty-five years of research in belief change

The 1985 paper by Carlos Alchourrón (1931–1996), Peter Gärdenfors, and David Makinson (AGM), “On the Logic of Theory Change: Partial Meet Contraction and Revision Functions” was the starting-point of a large and rapidly growing literature that employs formal models in the investigation of changes in belief states and databases. In this review, the first twenty five years of this development are summarized. The topics covered include equivalent characterizations of AGM operations, extended representations of the belief states, change operators not included in the original framework, iterated change, applications of the model, its connections with other formal frameworks, computatibility of AGM operations, and criticism of the model.info:eu-repo/semantics/publishedVersio

Editorial introduction—25 years of AGM theory

info:eu-repo/semantics/publishedVersio