In this paper I discuss and evaluate different arguments for the view that the laws of nature are metaphysically necessary. I conclude that essentialist arguments from the nature of natural kinds fail to establish that essences are ontologically more basic than laws, and fail to offer an a priori argument for the necessity of all causal laws. Similar considerations carry across to the argument ...

With a change of variables the Abel transform gives the projection of a 2-D distribution with circular symmetry. Thus the Abel inversion formula allows one to determine the radial dependence of such a distribution from its projection. However, this inversion formula is very sensitive to noise in the projection data. When the projection data are derived from radiographic measurements, further di...

Abstract The known a posteriori error analysis of hybrid high-order methods treats the stabilization contribution as part and estimator for an efficient reliable control. This paper circumvents on simplicial meshes arrives at stabilization-free with explicit residual-based adaptive mesh-refining well equilibrium-based guaranteed upper bound (GUB). Numerical evidence in Poisson model problem sup...

Original paper: John C. Dencker, Sophie Bacq, Marc Gruber, and Melvin Haas, Reconceptualizing necessity entrepreneurship: A contextualized framework of entrepreneurial processes under the condition...