Projection in the situation calculus refers to answering queries about the future evolutions of the modeled domain, while progression refers to updating the logical representation of the initial state so that it reflects the changes due to an executed action. In the general case projection is not decidable and progression may require second-order logic. In this paper we focus on a recent result...

BACKGROUND The aim of this paper is to ascertain if the subjective perception of the economic situation of a household is associated with the prevalence of disability in old age, net of education level. Subjective economic perception is less non-response biased. Knowing if the self-perceived economic situation is related to disability over and above education level has important implications bo...

Many journalistic articles and a few academic ones have been published on the occasion of the half century of the Cuban revolution comparing that nation’s economic and social situation in 1958 and 2008. Such exercise is complicated by serious methodological problems that have not been properly analyzed. This essay summarizes the swings of economic policy in the last 50 years; explains the diffi...

In epidemiological studies there exists the evidence of relationship between socio-economic status (SES) and health. The suspicious cause of these differences is life-style. The aim of the presented study was to identify the relationship between SES, demographic characteristics and the life-style in an industrial region. A structured questionnaire was distributed to a random sample of some 3,00...