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While empirical symmetries relate situations, theoretical symmetries relate models of a theory we use to represent them. An empirical symmetry is perfect if and only if any two situations it relates s...
Symmetries and invariances in classical physics
Symmetry Classical Mechanics Curie's Principle
2008/4/21
intended as invariance with respect to a transformation (more precisely, with respect to a transformation group), has acquired more and more importance in modern physics. This Chapter explores in 8 Se...
This is the table of contents and first chapter of "Symmetries in physics: philosophical reflections", edited by Katherine Brading and Elena Castellani, Cambridge University Press, 2003. As the organ...
Indiscernibles, General Covariance, and Other Symmetries
Leibniz identity of indiscernibles general covariance
2008/4/14
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 gener...
describe a problem about the relations among symmetries, laws, and measurable quantities. I explain why several ways of trying to solve it will not work, and I sketch a solution that might work. I di...