منابع مشابه
Some Psychological Difficulties of Evacuation
In the consideration of the success or failure of evacuation it must be remembered that evacuation is essentially an emergency measure. foster-Evacuation is a temporary foster-homing. In nonra1 ^ Wartime homing of children with unsatisfactory homes is carried out y ex ? aj evacuation was designed for the child coming from the bac groun j being home who was supposed to be sufficiently buoyant an...
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One of the most difficult problems in classical relativity is to understand how and when singularities form. In the 1960’s, Hawking and Penrose proved that the existence of a closed trapped surface in an asymptotically flat spacelike hypersurface gives rise to a singularity in space-time. However, no proof based on pure partial differential equation arguments was found, and many questions remai...
متن کاملSome Remarks on Mathematical General Relativity Theory
This paper gives a brief survey of the development of general relativity theory starting from Newtonian theory and Euclidean geometry and proceeding through to special relativity and finally to general relativity and relativistic cosmology.
متن کاملSome Conceptual Difficulties Regarding ‘Net’ Multipliers
Multipliers are routinely used for impact evaluation of private projects and public policies at the national and subnational levels. Oosterhaven & Stelder (2002) correctly pointed out the misuse of standard ‘gross’ multipliers and proposed the concept of ‘net’ multiplier as a solution to this bad practice. We prove their proposal is not well founded. We do so by showing that supporting theorems...
متن کاملSome Functional Equations in the Theory of Relativity. by Professor
IN transcribing the process of light-signalling which leads to his kinematic equations of transformation, Einstein* obtains relations, connecting the space-time coordinates in two systems of reference, in the form of functional equations. He solves these by passing to partial differential equations, and restricts the solutions to linearity by a rather obscure appeal to the homogeneity of time a...
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ژورنال
عنوان ژورنال: Nature
سال: 1927
ISSN: 0028-0836,1476-4687
DOI: 10.1038/120086a0