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A splitting theorem for $ 4$-dimensional manifolds of nonnegative curvature

Author: Gerard Walschap
Journal: Proc. Amer. Math. Soc. 104 (1988), 265-268
MSC: Primary 53C20
MathSciNet review: 958080
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Abstract: A structure theorem for four-dimensional open manifolds of non-negative curvature is stated. More generally, it is shown that any manifold with soul $ S$ of codimension 2 admits a Riemannian submersion onto $ S$, which splits as a metric product whenever $ S$ has flat normal bundle.

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