An orbit space of a nonlinear involution of $S^2\times S^2$ with nonnegative sectional curvature
نویسندگان
چکیده
منابع مشابه
an investigation of the types of text reduction in subtitling: a case study of the persian film gilaneh with english subtitles
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15 صفحه اولThe Smoothness of Riemannian Submersions with Nonnegative Sectional Curvature
In this article, we study the smoothness of Riemannian submersions for open manifolds with non-negative sectional curvature. Suppose thatM is a C-smooth, complete and non-compact Riemannian manifold with nonnegative sectional curvature. Cheeger-Gromoll [ChG] established a fundamental theory for such a manifold. Among other things, they showed that M admits a totally convex exhaustion {Ωu}u≥0 of...
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We study several properties of the Sharafutdinov dual foliation in open manifolds with nonnegative sectional curvature.
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Involving the Ricci curvature and the squared mean curvature, we obtain basic inequalities for different kind of submaniforlds of a Sasakian space form tangent to the structure vector field of the ambient manifold. Contrary to already known results, we find a different necessary and sufficient condition for the equality for Ricci curvature of C-totally real submanifolds of a Sasakian space form...
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ژورنال
عنوان ژورنال: Proceedings of the American Mathematical Society
سال: 2019
ISSN: 0002-9939,1088-6826
DOI: 10.1090/proc/14486