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Citation - WoS: 61
Citation - Scopus: 64
A curvature condition for a twisted product to be a warped product
(Springer-verlag, 2001) Fernández-López, M; García-Río, E; Kupeli, DN; Ünal, B
It is shown that a mixed Ricci-flat twisted product semi-Riemannian manifold can be expressed as a warped product semi-Riemannian manifold. Asa consequence, any Einstein twisted product semi-Riemannian manifold is in fact, a warped product serni-Riemannian manifold.
Citation - WoS: 31
Citation - Scopus: 30
Characterizing Specific Riemannian Manifolds by Differential Equations
(Springer, 2003) Erkekoglu, F; García-Río, E; Kupeli, DN; Ünal, B
Some characterizations of certain rank-one symmetric Riemannian manifolds by the existence of nontrivial solutions to certain partial differential equations on Riemannian manifolds are surveyed.