Indiscernibles, General Covariance, and Other Symmetries

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Saunders, Simon
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Leibniz's principle of identity of indiscernibles, formulated in modern logical terms, can be applied in a uniform way to all the exact physical symmetries, including the diffeomorphism group of general relativity. The framework that results is a form of relationalism, although it is not wedded to any reductionist program. Objections to near neighbours of these claims, by Stachel and Earman respectively, are considered and rejected.