While he dedicates space to the Special and General Theories of Relativity, the heart of the book beats for , not physics. Unlike texts that start with "Imagine an ant on a balloon," Chaki starts with "Consider the transformation of coordinates..." It is formal, axiomatic, and unapologetically abstract. You won't find extensive discussions on the physical interpretation of the metric tensor or the stress-energy tensor here; you will find the rigorous proof of its symmetries and transformations.
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