Einstein spacetimes with recurrent lightlike vector fields
classification
🧮 math.DG
gr-qchep-th
keywords
beenalreadyauthorclasseinsteinfieldsgravl147--l151
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This paper has been withdrawn by the author, since some results of the paper have been already obtained in [J.~Lewandowski, Class. Quantum Grav. 9 (1992), no. 10, L147--L151.]
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