Some more amplituhedra are contractible

Are Some Lives More Valuable?

A theoretical model of the ethical preferences of individuals is tested by conducting a choice experiment on safety-enhancing road investments. The relative value of a saved life is found to decrease with age, such that the present value of a saved year of life is almost independent of age at a pure rate of time preference of a few percent, and a saved car driver is valued 17-31% lower than a p...

When some are more equal than others.

Some Terms are more Interchangeable than Others

This paper describes the work done by the Information Retrieval Research Group at Océ Technologies B.V., for the Cross-Language Evaluation Forum (CLEF) 2001. We have participated in the Dutch Monolingual task and submitted three runs. In this paper we introduce a new method for relevance computation using two new query operators. This method is meant to be applied to Multilingual Retrieval in t...

Some Set Theories Are More Equal

The proof of independence of the Continuum Hypothesis by Paul Cohen in 1963 and the avalanche of additional independence results was the trigger to a very intensive discourse about the future of Set Theory and its foundational role in Mathematics. It will be only fair to say that while the invention of forcing initiated the blooming of Set Theory as a technical mathematical discipline, it had a...

Why are some representations (sometimes) more effective?

Graphical representations are used heavily in systems analysis and design without proper verification of their usability. However, different representations have varying impact on the effectiveness of systems analysts. The objective of this study was to explore the effects of diagrammatic representations on task behavior and performance. A cognitive model of an analysis and design task using di...