I Gravity: Introduction to Einstein's General Relativity

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The discussion revolves around the updated edition of "Gravity: Introduction to Einstein's General Relativity," questioning whether it is a true new edition or simply a reissue by a different publisher. Participants note that a sample is available on Amazon, which suggests minimal changes from the original text. The focus is on whether the content has been significantly revised or if it remains largely the same. This reissue may appeal to new readers or those seeking a refreshed presentation of Einstein's theories. Ultimately, the distinction between a new edition and a reissue is crucial for potential buyers.
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On Amazon, you can view a sample. Looks like a "reissue" of the original.
 

Thread 'Is using r as a coordinate in Birkhoff's theorem a limitation?'

In Birkhoff’s theorem, doesn’t assuming we can use r (defined as circumference divided by ## 2 \pi ## for any given sphere) as a coordinate across the spacetime implicitly assume that the spheres must always be getting bigger in some specific direction? Is there a version of the proof that doesn’t have this limitation? I’m thinking about if we made a similar move on 2-dimensional manifolds that ought to exhibit infinite order rotational symmetry. A cylinder would clearly fit, but if we...
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