In this paper, an algebraic classification of the Roter type spacetimes is given. It follows that the Roter type curvature condition is essentially equivalent with the pseudosymmetry condition on 4-dimensional Lorentzian manifolds.

中文翻译：

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罗特式时空的一种分类

本文给出了Roter型时空的代数分类。由此可见，Roter 型曲率条件本质上与 4 维洛伦兹流形上的伪对称条件等价。