Zobrazeno 1 - 7 of 7 pro vyhledávání: '"Sahnur Yaprak"'
1
P.J. Ryan's problem in semi-Riemannian space forms
Autor: Sahnur Yaprak, Zerrin Şentürk, Filip Defever, Leopold Verstraelen, Ryszard Deszcz
Publikováno v: Glasgow Mathematical Journal. 41:271-281
We prove that the conditions R·R=0 and R·S=0 are equivalent for hypersurfaces of a 5-dimensional semi-Riemannian space form N5(c). This solves a problem by P.J. Ryan in the case of hypersurfaces of dimension 4 in semi-Riemannian space forms.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d3f154404c6d15ef65540cdfcdfcf986
https://doi.org/10.1017/s0017089599970969
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2
[Untitled]
Autor: Ryszard Deszcz, Leopold Verstraelen, Sahnur Yaprak
Publikováno v: Acta Mathematica Hungarica. 78:45-57
The main result of this paper states that any 2-quasi-umbilical hypersurface of a semi-Riemannian conformally flat space is a manifold with pseudosymmetric Weyl tensor.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82c91beeddd063f8a72afdc1694c923b
https://doi.org/10.1023/a:1006566319359
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4
On ricci-pseudosymmetric hypersurfaces in spaces of constant curvature
Autor: Ryszard Deszcz, Filip Defever, Paul F. Dhooghe, Leopold Verstraelen, Sahnur Yaprak
Publikováno v: Results in Mathematics. 27:227-236
This article studies the conditions of pseudosymmetry and Ricci-pseudosymmetry, realizedon hypersurfaces of semi-Riemannian spaces of constant curvature. In particular, we derive extrinsic characterizations of pseudosymmetric and Ricci-pseudosymmetri
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6705a7bead6f1db8317f12a119c58842
https://doi.org/10.1007/bf03322827
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