Abstract
We explicitly determine invariant Ricci collineations on four-dimensional non-reductive homogeneous pseudo-Riemannian manifolds, and invariant matter collineations for the Lorentzian examples.
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The authors wish to thank the anonymous Referees for their useful remarks and comments.
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G. Calvaruso partially supported by funds of the University of Salento and MIUR (PRIN 2010–11).
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Calvaruso, G., Zaeim, A. Invariant symmetries on non-reductive homogeneous pseudo-Riemannian four-manifolds. Rev Mat Complut 28, 599–622 (2015). https://doi.org/10.1007/s13163-015-0168-8
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DOI: https://doi.org/10.1007/s13163-015-0168-8