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INTRODUCTION TO GENERAL RELATIVITY
webspace.science.uu.nlWe now have formulated the theory of Special Relativity in such a way that it has be-come very easy to check if some suspect Law of Nature actually obeys Lorentz invariance. Left- and right hand side of an equation must transform the same way, and this is guar-anteed if they are written as vectors or tensors with Lorentz indices always transforming