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ON KENMOTSU MANIFOLDS

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Abstract

The purpose of this paper is to study a Kenmotsu man-ifold which is derived from the almost contact Riemannian mani-fold with some special conditions. In general, we have some rela-tions about semi- symmetric, Ricci semi-symmetric or Weyl semi-symmetric conditions in Riemannian manifolds. In this paper, we partially classify the Kenmotsu manifold and consider the mani-fold admitting a transformation which keeps Riemannian curvature tensor and Ricci tensor invariant.

참고문헌 (9)

  1. "A class of contact Riemannian manifold", 24, pp.93~103 (1972)
  2. "Structure theorem on Riemannian spaces satisfyingR", pp.531~582 (1982)
  3. "Comments on pseudo-symmetry in the sence of R. Deszcz Geom-etry and Topology of submanifolds VI"
  4. "Some theorems on Ricci recurrent spaces", 27, pp.287~295 (1952)
  5. "Contact manifolds in Riemannian geometry Lecture Notes in Mathe-matics 509" (1976), Springer-Verlag
  6. "On a type of Sasakian manifold", 16, pp.23~28 (1990)
  7. "On a Riemannian space with recurrent conformalcurvature", n.s., pp.348~354 (1967)
  8. "Invariant submanifolds in Sasakian manifolds", 219, pp.277~290 (1976)
  9. "Lecture notes on almost contact manifolds" (1967), Tohoku University

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