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Search: MSC category 53B30 ( Lorentz metrics, indefinite metrics )

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1. CJM 2010 (vol 62 pp. 1037)

Calviño-Louzao, E.; García-Río, E.; Vázquez-Lorenzo, R.
 Riemann Extensions of Torsion-Free Connections with Degenerate Ricci Tensor {Correspondence} between torsion-free connections with {nilpotent skew-symmetric curvature operator} and IP Riemann extensions is shown. Some consequences are derived in the study of four-dimensional IP metrics and locally homogeneous affine surfaces. Keywords:Walker metric, Riemann extension, curvature operator, projectively flat and recurrent affine connectionCategories:53B30, 53C50

2. CJM 1999 (vol 51 pp. 449)

Bahn, Hyoungsick; Ehrlich, Paul
 A Brunn-Minkowski Type Theorem on the Minkowski Spacetime In this article, we derive a Brunn-Minkowski type theorem for sets bearing some relation to the causal structure on the Minkowski spacetime $\mathbb{L}^{n+1}$. We also present an isoperimetric inequality in the Minkowski spacetime $\mathbb{L}^{n+1}$ as a consequence of this Brunn-Minkowski type theorem. Keywords:Minkowski spacetime, Brunn-Minkowski inequality, isoperimetric inequalityCategories:53B30, 52A40, 52A38
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