Geodesically complete Lorentzian metrics on some homogeneous 3 manifolds.
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Bromberg, Shirley, Medina, Alberto (2008)
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An almost-Riemannian structure on a surface is a generalized Riemannian structure whose local orthonormal frames are given by Lie bracket generating pairs of vector fields that can become collinear. The distribution generated locally by orthonormal frames has maximal rank at almost every point of the surface, but in general it has rank 1 on a nonempty set which is generically a smooth curve. In this paper we provide a short introduction to 2-dimensional almost-Riemannian geometry highlighting...
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Udrişte, Constantin (1996)
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