Most areas of health research will have accepted data and a dominating interpretation. If the interpretation is not correct, contradictions will accumulate, and it will eventually become clear that the current interpretation is untenable. In this situation, the best hypothesis is the one that accounts for all of the known data as well as the apparent contradictions. The area of vitamin A supple...

We study deduction in the presence of inconsistencies. Following previous works, we capture deduction via datalog programs and inconsistencies through violations of functional dependencies (FDs). We study and compare two semantics for datalog with FDs: the first, of a logical nature, is based on inferring facts one at a time, while never violating the FDs; the second, of an operational nature, ...

In this note I say a few words about my interaction with the late Hartley Slater and his work. Si on appelle un chat un chat Cela évite les embrouilles Et on retombe toujours sur ses pattes Baron de Chambourcy 1 From Los Angeles to Helsinki: 20 years of friendship Barry Hartley Slater recently died (July 8, 2016). We are publishing in this issue of the South American Journal of Logic the paper ...

Introduction Dialectical contradictions, as conceptualized in Cultural-Historical Activity Theory (CHAT), can be used fruitfully as an analytical tool in order to study organizational change associated with the introduction of new technologies (Groleau, Demers, Lalancette, & Barros, 2011). Drawing from the work done by Engeström and Sannino (2011), this paper aims to contribute to the operation...

Contradictions in requirements are inevitable in early project stages. To resolve these contradictions, it is necessary to know the rationales (goals) that lead to the particular requirements. In early project stages one stakeholder rarely knows the goals of the others. Sometimes the stakeholders cannot explicitly state even their own goals. Thus, the goals have to be elaborated in the process ...

When it comes to understanding the dynamics of interaction between humans and technology, activity theory's principle of contradiction is very useful. This is because contradictions expose links between humans and technology. These links are in form of problems, ruptures, breakdowns, clashes, distortions and so on. In this paper, we used activity theory's principle of contradiction to analyze r...

A feature model defines each product in a product-line by a unique combination of features. Feature compatibilities are expressed as constraints in feature models and may be contradictory. We suggest a run-time approach to expose contradictions in feature models when they are uncovered. However, the emphasis of this paper is to explore the possibility of finding contradictions statically using ...