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21.
In affine differential geometry there are several notions of completeness,in thispaper we study: 1)affine completeness,that is,completeness of the Blaschke metric on M; 2)Euclidean completeness,that is,completeness of the Riemannian metric on 相似文献
22.
Let M be a compact n-dimensional Einstein manifold without boundary. Denoteby R_(ijkl) the Riemannian curvature tensor with respect to a local orthonormal framefield. Tbe Ricci curvature tensor is given by 相似文献