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texto impreso
The classification of 4-dimensional naturally reductive pseudo-Riemannian spaces is given. This classification comprises symmetric spaces, the product of 3-dimensional naturally reductive spaces with the real line and new families of indecomposa[...]texto impreso
Let M be a smooth oriented connected n-dimensional manifold and let M be the space of pseudo-Riemannian metrics on M of a given signature (n+,n?),n++n?=n> 1. A system of n metric invariants is attached to each metric in M, called the Ricci invar[...]
