A new approach to inhomogeneous cosmologies: Intrinsic symmetries. I

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Abstract
After briefly discussing systematic ways of studying inhomogeneous cosmologies, we propose the technique of ’’intrinsic symmetries,’’ in which restrictions are placed on submanifolds of space–time. This leads to a broad classification of inhomogeneous cosmologies, and to an associated specialization diagram. By enforcing additional restrictions we obtain a further useful specialization.