منابع مشابه
Need Not Preserve Positive
If π : M → B is a Riemannian Submersion and M has positive sectional curvature, O’Neill’s Horizontal Curvature Equation shows that B must also have positive curvature. We show there are Riemannian submersions from compact manifolds with positive Ricci curvature to manifolds that have small neighborhoods of (arbitrarily) negative Ricci curvature, but that there are no Riemannian submersions from...
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ژورنال
عنوان ژورنال: British Journal of Surgery
سال: 2020
ISSN: 0007-1323,1365-2168
DOI: 10.1093/bjs/znaa114