• Communications of the Korean Mathematical Society
• /
• v.22 no.3
• /
• pp.411-417
• /
• 2007

N(k)-quasi Einstein manifolds are introduced and studied.

• Bulletin of the Korean Mathematical Society
• /
• v.54 no.1
• /
• pp.177-186
• /
• 2017

In this paper, a type of Riemannian manifold (namely, pseudo semiconformally symmetric manifold) is introduced. Also the several geometric properties of such a manifold is investigated. Finally the existence of such a manifold is ensured by a proper example.

• Korean Journal of Mathematics
• /
• v.4 no.2
• /
• pp.163-171
• /
• 1996

We investigate change of the torsion tensor induced by the conformal change in 6-dimensional $g$-unified field theory. These topics will be studied for the second class with the second category in 6-dimensional case.

• Kyungpook Mathematical Journal
• /
• v.58 no.1
• /
• pp.105-116
• /
• 2018

In this paper, the object is to study a semi-symmetric non-metric connection on an LP-Sasakian manifold whose concircular curvature tensor satisfies certain curvature conditions.

• Honam Mathematical Journal
• /
• v.29 no.4
• /
• pp.681-694
• /
• 2007

We study curvature properties of four-dimensional almost Hermitian manifolds with vanishing Bochner curvature tensor as defined by Tricerri and Vanhecke. We give some structure theorems for such manifolds.

• Journal of The Korean Astronomical Society
• /
• v.29 no.spc1
• /
• pp.283-284
• /
• 1996

Wormhole solutions of general theory of relativity are known to violate energy conditions. We have considered the possibility of having wormhole solutions in Brans-Dicke theory which is the prototype of scalar-tensor theories of gravity.

• Korean Journal of Mathematics
• /
• v.5 no.2
• /
• pp.141-149
• /
• 1997

We investigate chnage of the tensor $U^{\nu}{_{\lambda}{\mu}}$ induced by the conformal change in 6-dimensional $g$-unified field theory. These topics will be studied for the second class with the second category in 6-dimensional case.

• Bulletin of the Korean Mathematical Society
• /
• v.38 no.1
• /
• pp.197-203
• /
• 2001

We investigate change of the torsion tensor $S_\omega\mu^\nu$ induced by the conformal change in 7-dimensional g-unified field theory. These topics will be studied for the second class with the first category in 7-dimensional case.

• Communications of the Korean Mathematical Society
• /
• v.32 no.4
• /
• pp.1033-1045
• /
• 2017

The conharmonic curvature tensor under certain conditions has been studied for Kenmotsu manifolds with respect to the semi-symmetric metric connection.

• Communications of the Korean Mathematical Society
• /
• v.9 no.2
• /
• pp.393-400
• /
• 1994

Let M(f,η,ξ,g) be a (2m ＋ 1)-dimensional Sasakian manifold with soldering form dp ∈ ΓHom(Λ/sup q/TM, TM) (dp: canonical vector-valued 1-form) where f,η,ξ and g are the (1,1)-tensor field, the structure 1-form, the structure vector field and the metric tensor of M, respectively.(omitted)