Relativity by Albert Einstein

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Relativity: the special and the general theory  by Albert Einstein

It really is elegant in its simplicity. Einstein’s explanation of the basis and origin of Special Relativity is especially intuitive and easy to follow, even with just a background of high school geometry. It is also quite surprising to find that the derivation of E = m c^2 comes from the necessity of the speed of light being constant for all reference frames in relative motion.

The General Theory, however, really can’t be understood apart from non-Euclidean geometry, so the explanation of it is much harder to follow. It is still worth the read, though, to see Einstein’s explanation of how the effect of gravity is indistinguishable from the effect of steady acceleration, and how this leads to the conclusion that space curves in the presence of mass. It will also surprise many, as it did me, how much emphasis Einstein puts on the equivalence of time and space in the structure of the universe, compared to how little time he spends on the equivalent of energy and matter. All in all a great read.

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