On the Signature of Ricci Curvature Tensor Operator of Three-Dimensional Lie Groups with Left-Invariant Lorentzian Metrics

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Пастухова, С.В.; Хромова, О.П.;

Curvatures of left-invariant Riemannian metrics on Lie groups were studied by J. Milnor. Possible signatures of the Ricci operator were found for the case of three-dimensional Lie groups with leftinvariant Riemannian metric. Further, O. Kowalski and S. Nikcevic found th... View more
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