On open three manifolds of quasi-positive Ricci curvature

Zhu, Shun-Hui

doi:10.1090/S0002-9939-1994-1166362-2

On open three manifolds of quasi-positive Ricci curvature
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Proc. Amer. Math. Soc. 120 (1994), 569-572 Request permission

Abstract:

It is proved that an open three-manifold of Ricci curvature nonnegative and positive at one point is diffeomorphic to the three-dimensional Euclidean space.

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