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Semi-Einstein spaces. (English) Zbl 0627.53035

In this paper semi-Einstein spaces are defined and a characteristic property, which separates these spaces from Einstein spaces, is given. Furthermore, the special case of a semi-Einstein space, which simultaneously also is an Einstein space, is studied.
Reviewer: Z.Jankovský

MSC:

53C25 Special Riemannian manifolds (Einstein, Sasakian, etc.)
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