“All models are wrong but some are useful" [1]. We address the problem of identifying which diagnosis models are more useful than others. Models are critical to diagnostics inference, yet little work exists to be able to compare models. We define the role of models in diagnostics inference, propose metrics for models, and apply these metrics to a tank benchmark system. Given the many approaches...

Let B be the set of n-dimensional binary vectors and let V be a subset of m of its elements. We give an extended formulation of the convex hull of B \ V which is polynomial in n and m. In developing this result, we give a two-sided extension of the result in [3] for knapsack sets with superincreasing coefficients.

Observations of the apparent times and positions of moving clocks as predicted by both 'non-local' and 'local' Lorentz Transformations are considered. Only local transformations respect translational invariance. Such transformations change temporal but not spatial intervals, so breaking space time exchange symmetry and forbidding relativity of simultaneity and length contraction. A satellite ce...

While poverty and violence are not limited to one geographic region of the United States, unique demographic and geographic factors pose distinct problems in specific areas. In Escondido, CA, the city council linked poverty and crime to illegal immigration and proposed an ordinance forbidding landlords to rent to illegal immigrants. This article explores that case and examines implications for ...