A review of the geometrical equivalence of metrics in general relativity
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- Karlhede, A. Gen Relat Gravit (1980) 12: 693. doi:10.1007/BF00771861
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We review the solution to the equivalence problem in general relativity given by Cartan and Brans and present a practically useful method to obtain a coordinate-invariant description of a geometry. The method, which can be seen as a generalized Petrov classification, automatically gives the dimensions of the isometry group and its isotropy subgroup. Finally, we illustrate the method using the Schwarzschild solution as a very simple example.