期刊
MANUSCRIPTA MATHEMATICA
卷 106, 期 2, 页码 213-217出版社
SPRINGER-VERLAG
DOI: 10.1007/s002290100204
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It is shown that a mixed Ricci-flat twisted product semi-Riemannian manifold can be expressed as a warped product semi-Riemannian manifold. Asa consequence, any Einstein twisted product semi-Riemannian manifold is in fact, a warped product serni-Riemannian manifold.
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