R. Deszcz, M. Glogowska, Marian Hotlo's, Miroslava Petrovi'c-Torgavsev, G. Zafindratafa
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For any semi-Riemannian manifold (M, g) we define some generalized curvature tensor E as a linear combination of Kulkarni-Nomizu products formed by the metric tensor, the Ricci tensor and its square of given manifold. That tensor is closely related to quasi-Einstein spaces, Roter spaces and some Roter type spaces.
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