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In general relativity, Kruskal–Szekeres coordinates, named after Martin Kruskal and George Szekeres, are a coordinate system for the Schwarzschild geometry for a black hole. These coordinates have the advantage that they cover the entire spacetime manifold of the maximally extended Schwarzschild solution and are well-behaved everywhere ...
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You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses ...
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Kruskal count principle: Image title: Explanation of the Kruskal Count mathematical magic trick, by CMG Lee. A volunteer picks a number on a clock face. Starting from 12, we move clockwise the same number of spaces as letters in the number spelled out, with wraparound. We move clockwise again the same number of spaces as letters in the new number.
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In general relativity, solutions to the Einstein field equation are specified locally using coordinate charts. Many of these are sufficiently important in the subject to have their own names and their own Wikipedia articles. We collect them here.
There are several different types of coordinate chart that are adapted to this family of nested spheres, each introducing a different kind of distortion. The best known alternative is the Schwarzschild chart , which correctly represents distances within each sphere, but (in general) distorts radial distances and angles .