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Singular Riemannian metrics, sub-rigidity vs rigidity (1104.3657v1)
Published 19 Apr 2011 in math.DG
Abstract: We analyze sub-Riemannian and lightlike metrics from the point of view of their rigidity as geometric structures. Following Cartan's and Gromov's formal definitions, they are never rigid, yet, in generic cases, they naturally give rise to rigid geometric structures!?
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