QR-hypersurfaces of quaternionic Kähler manifolds.
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Mangione, Vittorio (2003)
Balkan Journal of Geometry and its Applications (BJGA)
Bang-Yen Chen, Franki Dillen, Hong-Zao Song (1992)
Colloquium Mathematicae
C. von Westenholz (1971)
Annales de l'I.H.P. Physique théorique
Majewski, Adam W., Zegarlinski, Boguslaw (1995)
Mathematical Physics Electronic Journal [electronic only]
Ryszard Deszcz, Marian Hotloś, Zerrin Sentürk (2001)
Colloquium Mathematicae
We investigate curvature properties of hypersurfaces of a semi-Riemannian space form satisfying R·C = LQ(S,C), which is a curvature condition of pseudosymmetry type. We prove that under some additional assumptions the ambient space of such hypersurfaces must be semi-Euclidean and that they are quasi-Einstein Ricci-semisymmetric manifolds.
Lung Ock Chung, Leo Sario, Cecilia Wang (1975)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
Georgi Ganchev, Velichka Milousheva (2014)
Open Mathematics
In the four-dimensional pseudo-Euclidean space with neutral metric there are three types of rotational surfaces with two-dimensional axis - rotational surfaces of elliptic, hyperbolic or parabolic type. A surface whose mean curvature vector field is lightlike is said to be quasi-minimal. In this paper we classify all rotational quasi-minimal surfaces of elliptic, hyperbolic and parabolic type, respectively.
K. Galicki, H.B. Jr. Lawson (1988)
Mathematische Annalen
Claude LeBrun (1989)
Mathematische Annalen
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