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标题：Two theorems on <mml:math alttext="\[ \left( \varepsilon \right) \]" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mi>ϵ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>-Sasakian manifolds
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作者：Xu Xufeng ; Chao Xiaoli
期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：1998
卷号：21
DOI：10.1155/S0161171298000350
出版社：Hindawi Publishing Corporation
摘要：In this paper, We prove that every (ϵ)-sasakian manifold is a hypersurface of an indefinite kaehlerian manifold, and give a necessary and sufficient condition for a Riemannian manifold to be an (ϵ)-sasakian manifold.