Yazar "De U.C." seçeneğine göre listele

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    On a class of generalized sasakian-space-forms
    (Univerzita Komenskeho, 2018) Majhi P.; De U.C.; Yildiz A.
    The object of the present paper is to study quasi-conformally at generalized Sasakian-space-forms. Also we study quasi-conformally semisymmetric generalized Sasakian-space-forms. As a consequence of the results, we obtain some important corollaries. © 2018, Univerzita Komenskeho. All rights reserved.
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    On a type of lorentzian Para-Sasakian manifolds
    (Editura Academiei Romane, 2014) Yildiz A.; De U.C.; Ata E.
    The object of the present paper is to introduce a new concept called generalized ?-Einstein manifold in a Lorentzian Para-Sasakian manifold. Some geometric properties have been studied. Finally an example has been constructed to prove the existance of a generalized ?-Einstein Lorentzian Para-Sasakian manifold.
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    Some curvature conditions on n(k)-quasi-einstein manifolds
    (Universitatii Al.I.Cuza din Iasi, 2016) De U.C.; Yildiz A.; Mallick S.
    The object of the present paper is to study N(k)-quasi-Einstein manifolds. Existence of N(k)-quasi Einstein manifolds is proved by a non-trivial example. Also some physical examples of N(k)-quasi-Einstein manifolds are given. We study an N(k)-quasi-Einstein manifold satisfying the curvature conditions C(?, X) · R = 0, R(?, X) · (formula present) = 0, and W (?, X) · S = 0, where R, C, (formula present) and S denote the Riemannian curvature tensor, the conformal curvature tensor, m-projective curvature tensor and Ricci tensor respectively. © 2016, Universitatii Al.I.Cuza din Iasi. All rights reserved.