منابع مشابه
Brane worlds in collision.
We obtain an exact solution of the supergravity equations of motion in which the four-dimensional observed Universe is one of a number of colliding D3 branes in a Calabi-Yau background. The collision results in the ten-dimensional spacetime splitting into disconnected regions, bounded by curvature singularities. However, near the D3 branes the metric remains static during and after the collisio...
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Many techniques of concurrency control and crash recovery are implementation instances of an abstract "world tree" model. This abstract model factors out most low-level implementation details of transactions, intentions, shadowing and logging, so that the essential issues like conflict resolution can be seen more easily. Parallel synchronization can often be seen as a merging of disparate world...
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It is sometimes argued that possible worlds are too rich. Indeed, for every sentence φ and every world w, either φ is true at w, or ¬φ is true at w. Possible worlds leave nothing unsettled: for any question one may ask, there is always an answer, yes or no. My view goes along the opposite side. I take possible worlds to be incredibly poor, and I think that a good deal can be added to them. The ...
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ژورنال
عنوان ژورنال: Nature
سال: 1993
ISSN: 0028-0836,1476-4687
DOI: 10.1038/361399a0