ABSTRACT
We obtain the Newman-Penrose (NP) version of the Riemann tensor and the corresponding Bianchi identities. We also realize the NP transcription of the Weyl-Lanczos equations, and we emphasize that it is an open problem to find general solutions of this equations for the Petrov types I, II, and D, and to establish the possible physical meaning of the Lanczos potential.
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