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 'Physical Interpretation of Frame Field'

Moderator's note: Spin-off from another thread due to topic change. In the second link referenced, there is a claim about a physical interpretation of frame field. Consider a family of observers whose worldlines fill a region of spacetime. Each of them carries a clock and a set of mutually orthogonal rulers. Each observer points in the (timelike) direction defined by its worldline's tangent at any given event along it. What about the rulers each of them carries ? My interpretation: each...
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